Trial Outcomes & Findings for Bortezomib, Selinexor, and Dexamethasone in Patients With Multiple Myeloma (NCT NCT03110562)

Last Updated: 2024-08-21

Results Overview

PFS was defined as time from date of randomization until the first date of IRC-confirmed PD, per International Myeloma Working Group (IMWG) response criteria, or death due to any cause, whichever occurs first. PD included increase of 25% from lowest confirmed response value in 1 or more of the following criteria: a) serum M-protein with absolute increase of \>= 0.5 gram per deciliter (g/dL); b) serum M-protein increase \>= 1 g/dL if the lowest M-component was \>=5 g/dL; c) urine M-protein (absolute increase must be \>= 200 mg per 24 hours); d) in participants without measurable serum and urine M-protein levels: the difference between involved and uninvolved free light chain (FLC) levels (absolute increase must be greater than \[\>\] 10 mg/dL); e) in participants without measurable serum and urine M-protein levels and without measurable involved FLC levels: bone marrow plasma cell percentage irrespective of baseline status (absolute increase must be \>=10%).

Recruitment status

COMPLETED

Study phase

PHASE3

Target enrollment

402 participants

Primary outcome timeframe

From date of randomization until IRC-confirmed documented PD or death, censored date, whichever occurred first (up to 33 months)

Results posted on

2024-08-21

Participant Flow

The study was conducted at 165 investigative sites in 21 countries. A total of 402 participants were enrolled and randomized, of which 399 participants received SVd treatment (195 participants) or Vd treatment (204 participants).

Following confirmation of progressive disease (PD) by the Independent Review Committee (IRC), 204 participants in the safety population who received Vd treatment were allowed to cross over to receive either SVdX treatment (66 participants) or SdX treatment (14 participants).

Participant milestones

Participant milestones
Measure	SVd Arm: Selinexor + Bortezomib + Dexamethasone Participants received a fixed oral dose of 100 milligrams (mg) selinexor tablets (5 tablets of 20 mg each) once weekly (QW) on Days 1, 8, 15, 22, and 29 of each 35-day cycle, along with subcutaneous (SC) injection of 1.3 milligrams per square meter (mg/m\^2) bortezomib QW on Days 1, 8, 15, and 22 of each 35-day cycle, and an oral dose of 20 mg of dexamethasone twice weekly (BIW) on Days 1, 2, 8, 9, 15, 16, 22, 23, 29, and 30 of each 35-day cycle until PD confirmed by the IRC, investigator or participant decision to discontinue study treatment, pregnancy, unacceptable AEs or toxicity that could not be managed by supportive care, withdrawal of consent, death, or sponsor decision to terminate the study.	Vd Arm: Bortezomib + Dexamethasone Participants received SC injection of 1.3 mg/m\^2 bortezomib on Days 1, 4, 8, and 11 of each 21-day cycle for the first 8 cycles, followed by greater than or equal to (\>=) 9 cycles on Days 1, 8, 15, and 22 of each 35-day cycle, and received oral dose of 20 mg dexamethasone BIW on Days 1, 2, 4, 5, 8, 9, 11, and 12 of each 21-day cycle for the first 8 cycles and for cycles \>= 9 on Days 1, 2, 8, 9, 15, 16, 22, 23, 29, and 30 of each 35-day cycle until PD confirmed by the IRC, investigator or participant decision to discontinue study treatment, pregnancy, unacceptable AEs or toxicity that could not be managed by supportive care, withdrawal of consent, death, or sponsor decision to terminate the study.	SVdX Arm: Selinexor + Bortezomib + Dexamethasone Participants in the VD arm who had IRC-confirmed PD and were able to tolerate continued bortezomib treatment had crossed over to receive fixed oral dose of 100 mg selinexor tablets (5 tablets of 20 mg each) QW on Days 1, 8, 15, 22, and 29 of each 35-day cycle, along with SC injection of 1.3 mg/m\^2 bortezomib QW on Days 1, 8, 15, and 22 of each 35-day cycle, and an oral dose of 20 mg of dexamethasone BIW on Days 1, 2, 8, 9, 15, 16, 22, 23, 29, and 30 of each 35-day cycle until PD confirmed by the IRC, investigator or participant decision to discontinue study treatment, pregnancy, unacceptable AEs or toxicity that could not be managed by supportive care, withdrawal of consent, death, or sponsor decision to terminate the study.	SdX Arm: Selinexor + Dexamethasone Participants in the VD arm who had IRC-confirmed PD and were unable to tolerate continued bortezomib treatment had crossed over to receive fixed oral dose of 100 mg selinexor tablets (5 tablets of 20 mg each) QW on Days 1, 8, 15, 22, and 29 of each 35-day cycle, and an oral dose of 20 mg of dexamethasone BIW on Days 1, 2, 8, 9, 15, 16, 22, 23, 29, and 30 of each 35-day cycle until PD confirmed by the IRC, investigator or participant decision to discontinue study treatment, pregnancy, unacceptable AEs or toxicity that could not be managed by supportive care, withdrawal of consent, death, or sponsor decision to terminate the study.
Initial Treatment Period STARTED	195	207	0	0
Initial Treatment Period Treated	195	204	0	0
Initial Treatment Period Intent-to-treat (ITT) Population	195	207	0	0
Initial Treatment Period Safety Population	195	204	0	0
Initial Treatment Period COMPLETED	0	0	0	0
Initial Treatment Period NOT COMPLETED	195	207	0	0
Crossover Period STARTED	0	0	66	14
Crossover Period COMPLETED	0	0	0	0
Crossover Period NOT COMPLETED	0	0	66	14

Reasons for withdrawal

Reasons for withdrawal
Measure	SVd Arm: Selinexor + Bortezomib + Dexamethasone Participants received a fixed oral dose of 100 milligrams (mg) selinexor tablets (5 tablets of 20 mg each) once weekly (QW) on Days 1, 8, 15, 22, and 29 of each 35-day cycle, along with subcutaneous (SC) injection of 1.3 milligrams per square meter (mg/m\^2) bortezomib QW on Days 1, 8, 15, and 22 of each 35-day cycle, and an oral dose of 20 mg of dexamethasone twice weekly (BIW) on Days 1, 2, 8, 9, 15, 16, 22, 23, 29, and 30 of each 35-day cycle until PD confirmed by the IRC, investigator or participant decision to discontinue study treatment, pregnancy, unacceptable AEs or toxicity that could not be managed by supportive care, withdrawal of consent, death, or sponsor decision to terminate the study.	Vd Arm: Bortezomib + Dexamethasone Participants received SC injection of 1.3 mg/m\^2 bortezomib on Days 1, 4, 8, and 11 of each 21-day cycle for the first 8 cycles, followed by greater than or equal to (\>=) 9 cycles on Days 1, 8, 15, and 22 of each 35-day cycle, and received oral dose of 20 mg dexamethasone BIW on Days 1, 2, 4, 5, 8, 9, 11, and 12 of each 21-day cycle for the first 8 cycles and for cycles \>= 9 on Days 1, 2, 8, 9, 15, 16, 22, 23, 29, and 30 of each 35-day cycle until PD confirmed by the IRC, investigator or participant decision to discontinue study treatment, pregnancy, unacceptable AEs or toxicity that could not be managed by supportive care, withdrawal of consent, death, or sponsor decision to terminate the study.	SVdX Arm: Selinexor + Bortezomib + Dexamethasone Participants in the VD arm who had IRC-confirmed PD and were able to tolerate continued bortezomib treatment had crossed over to receive fixed oral dose of 100 mg selinexor tablets (5 tablets of 20 mg each) QW on Days 1, 8, 15, 22, and 29 of each 35-day cycle, along with SC injection of 1.3 mg/m\^2 bortezomib QW on Days 1, 8, 15, and 22 of each 35-day cycle, and an oral dose of 20 mg of dexamethasone BIW on Days 1, 2, 8, 9, 15, 16, 22, 23, 29, and 30 of each 35-day cycle until PD confirmed by the IRC, investigator or participant decision to discontinue study treatment, pregnancy, unacceptable AEs or toxicity that could not be managed by supportive care, withdrawal of consent, death, or sponsor decision to terminate the study.	SdX Arm: Selinexor + Dexamethasone Participants in the VD arm who had IRC-confirmed PD and were unable to tolerate continued bortezomib treatment had crossed over to receive fixed oral dose of 100 mg selinexor tablets (5 tablets of 20 mg each) QW on Days 1, 8, 15, 22, and 29 of each 35-day cycle, and an oral dose of 20 mg of dexamethasone BIW on Days 1, 2, 8, 9, 15, 16, 22, 23, 29, and 30 of each 35-day cycle until PD confirmed by the IRC, investigator or participant decision to discontinue study treatment, pregnancy, unacceptable AEs or toxicity that could not be managed by supportive care, withdrawal of consent, death, or sponsor decision to terminate the study.
Initial Treatment Period Disease Progression	1	1	0	0
Initial Treatment Period Withdrawal by Subject	39	41	0	0
Initial Treatment Period Adverse Event	1	0	0	0
Initial Treatment Period Death	74	82	0	0
Initial Treatment Period Lost to Follow-up	13	8	0	0
Initial Treatment Period Protocol Deviation	1	0	0	0
Initial Treatment Period Physician Decision	2	1	0	0
Initial Treatment Period Participants withdrawn due to company goals	59	67	0	0
Initial Treatment Period Other	5	4	0	0
Initial Treatment Period Randomized but never treated	0	3	0	0
Crossover Period Disease Progression	0	0	1	0
Crossover Period Withdrawal by Subject	0	0	8	6
Crossover Period Death	0	0	37	3
Crossover Period Lost to Follow-up	0	0	0	1
Crossover Period Other	0	0	1	1
Crossover Period Participants withdrawn due to company goals	0	0	19	3

Baseline Characteristics

Bortezomib, Selinexor, and Dexamethasone in Patients With Multiple Myeloma

Baseline characteristics by cohort

Baseline characteristics by cohort
Measure	SVd Arm: Selinexor + Bortezomib + Dexamethasone n=195 Participants Participants received a fixed oral dose of 100 mg selinexor tablets (5 tablets of 20 mg each) QW on Days 1, 8, 15, 22, and 29 of each 35-day cycle, along with SC injection of 1.3 mg/m\^2 bortezomib QW on Days 1, 8, 15, and 22 of each 35-day cycle, and an oral dose of 20 mg of dexamethasone BIW on Days 1, 2, 8, 9, 15, 16, 22, 23, 29, and 30 of each 35-day cycle until PD confirmed by the IRC, investigator or participant decision to discontinue study treatment, pregnancy, unacceptable AEs or toxicity that could not be managed by supportive care, withdrawal of consent, death, or sponsor decision to terminate the study.	Vd Arm: Bortezomib + Dexamethasone n=207 Participants Participants received SC injection of 1.3 mg/m\^2 bortezomib on Days 1, 4, 8, and 11 of each 21-day cycle for the first 8 cycles, followed by \>= 9 cycles on Days 1, 8, 15, and 22 of each 35-day cycle, and received oral dose of 20 mg dexamethasone BIW on Days 1, 2, 4, 5, 8, 9, 11, and 12 of each 21-day cycle for the first 8 cycles and for cycles \>= 9 on Days 1, 2, 8, 9, 15, 16, 22, 23, 29, and 30 of each 35-day cycle until PD confirmed by the IRC, investigator or participant decision to discontinue study treatment, pregnancy, unacceptable AEs or toxicity that could not be managed by supportive care, withdrawal of consent, death, or sponsor decision to terminate the study.	Total n=402 Participants Total of all reporting groups
Age, Continuous	65.3 Years STANDARD_DEVIATION 9.56 • n=5 Participants	66.7 Years STANDARD_DEVIATION 9.35 • n=7 Participants	66.0 Years STANDARD_DEVIATION 9.47 • n=5 Participants
Sex: Female, Male Female	80 Participants n=5 Participants	92 Participants n=7 Participants	172 Participants n=5 Participants
Sex: Female, Male Male	115 Participants n=5 Participants	115 Participants n=7 Participants	230 Participants n=5 Participants
Race/Ethnicity, Customized Race · Asian	25 Participants n=5 Participants	25 Participants n=7 Participants	50 Participants n=5 Participants
Race/Ethnicity, Customized Race · Black or African American	4 Participants n=5 Participants	7 Participants n=7 Participants	11 Participants n=5 Participants
Race/Ethnicity, Customized Race · White	161 Participants n=5 Participants	165 Participants n=7 Participants	326 Participants n=5 Participants
Race/Ethnicity, Customized Race · Other	0 Participants n=5 Participants	1 Participants n=7 Participants	1 Participants n=5 Participants
Race/Ethnicity, Customized Race · Missing	5 Participants n=5 Participants	9 Participants n=7 Participants	14 Participants n=5 Participants
Race/Ethnicity, Customized Ethnicity · Hispanic or Latino	6 Participants n=5 Participants	5 Participants n=7 Participants	11 Participants n=5 Participants
Race/Ethnicity, Customized Ethnicity · Not Hispanic or Latino	171 Participants n=5 Participants	188 Participants n=7 Participants	359 Participants n=5 Participants
Race/Ethnicity, Customized Ethnicity · Not Reported	14 Participants n=5 Participants	11 Participants n=7 Participants	25 Participants n=5 Participants
Race/Ethnicity, Customized Ethnicity · Unknown	4 Participants n=5 Participants	2 Participants n=7 Participants	6 Participants n=5 Participants
Race/Ethnicity, Customized Ethnicity · Missing	0 Participants n=5 Participants	1 Participants n=7 Participants	1 Participants n=5 Participants

PRIMARY outcome

Timeframe: From date of randomization until IRC-confirmed documented PD or death, censored date, whichever occurred first (up to 33 months)

Population: ITT population consisted of all participants who were randomized to the study treatment, regardless of whether or not they received the study treatment. Data was not planned to be reported for SVdx arm and Sdx arm.

Outcome measures

Outcome measures
Measure	SVd Arm: Selinexor + Bortezomib + Dexamethasone n=195 Participants Participants received a fixed oral dose of 100 mg selinexor tablets (5 tablets of 20 mg each) QW on Days 1, 8, 15, 22, and 29 of each 35-day cycle, along with SC injection of 1.3 mg/m\^2 bortezomib QW on Days 1, 8, 15, and 22 of each 35-day cycle, and an oral dose of 20 mg of dexamethasone BIW on Days 1, 2, 8, 9, 15, 16, 22, 23, 29, and 30 of each 35-day cycle until PD confirmed by the IRC, investigator or participant decision to discontinue study treatment, pregnancy, unacceptable AEs or toxicity that could not be managed by supportive care, withdrawal of consent, death, or sponsor decision to terminate the study.	Vd Arm: Bortezomib + Dexamethasone n=207 Participants Participants received SC injection of 1.3 mg/m\^2 bortezomib on Days 1, 4, 8, and 11 of each 21-day cycle for the first 8 cycles, followed by \>= 9 cycles on Days 1, 8, 15, and 22 of each 35-day cycle, and received oral dose of 20 mg dexamethasone BIW on Days 1, 2, 4, 5, 8, 9, 11, and 12 of each 21-day cycle for the first 8 cycles and for cycles \>= 9 on Days 1, 2, 8, 9, 15, 16, 22, 23, 29, and 30 of each 35-day cycle until PD confirmed by the IRC, investigator or participant decision to discontinue study treatment, pregnancy, unacceptable AEs or toxicity that could not be managed by supportive care, withdrawal of consent, death, or sponsor decision to terminate the study.	SVdX Arm: Selinexor + Bortezomib + Dexamethasone Participants in the VD arm who had IRC-confirmed PD and were able to tolerate continued bortezomib treatment had crossed over to receive fixed oral dose of 100 mg selinexor tablets (5 tablets of 20 mg each) QW on Days 1, 8, 15, 22, and 29 of each 35-day cycle, along with SC injection of 1.3 mg/m\^2 bortezomib QW on Days 1, 8, 15, and 22 of each 35-day cycle, and an oral dose of 20 mg of dexamethasone BIW on Days 1, 2, 8, 9, 15, 16, 22, 23, 29, and 30 of each 35-day cycle until PD confirmed by the IRC, investigator or participant decision to discontinue study treatment, pregnancy, unacceptable AEs or toxicity that could not be managed by supportive care, withdrawal of consent, death, or sponsor decision to terminate the study.
SVd/Vd Arm: Progression-free Survival (PFS) as Assessed by Independent Review Committee (IRC)	13.93 Months Interval 11.73 to Upper limit of 95% CI was not estimable due to low number of events.	9.46 Months Interval 8.11 to 10.78	—

SECONDARY outcome

Timeframe: From date of randomization until disease progression or initiating a new MM treatment (up to 33 months)

ORR was defined as the percentage of the participants who achieved any confirmed partial response (PR) or better PR, complete response (CR), very good partial response (VGPR) or stringent complete response (sCR) based on the IRC's response outcome assessments, according to the International Myeloma Working Group (IMWG) response criteria, before IRC-confirmed PD or initiating a new MM treatment. PR: \>= 50% reduction of serum M-Protein and reduction in 24-hour urinary M-protein by \>= 90% or to \< 200 mg per 24 hours; VGPR: Serum and urine M-protein detectable by immunofixation but not on electrophoresis or 90% or greater reduction in serum M-protein plus urine M-protein level \< 100 mg per 24 hours; CR: Negative immunofixation on the serum and urine and disappearance of any soft tissue plasmacytomas and \<= 5% plasma cells in bone marrow; or stringent complete response (sCR): CR as defined as Normal free light chain (FLC) ratio + Absence of clonal cells by immunohistochemistry.

Outcome measures

Outcome measures
Measure	SVd Arm: Selinexor + Bortezomib + Dexamethasone n=195 Participants Participants received a fixed oral dose of 100 mg selinexor tablets (5 tablets of 20 mg each) QW on Days 1, 8, 15, 22, and 29 of each 35-day cycle, along with SC injection of 1.3 mg/m\^2 bortezomib QW on Days 1, 8, 15, and 22 of each 35-day cycle, and an oral dose of 20 mg of dexamethasone BIW on Days 1, 2, 8, 9, 15, 16, 22, 23, 29, and 30 of each 35-day cycle until PD confirmed by the IRC, investigator or participant decision to discontinue study treatment, pregnancy, unacceptable AEs or toxicity that could not be managed by supportive care, withdrawal of consent, death, or sponsor decision to terminate the study.	Vd Arm: Bortezomib + Dexamethasone n=207 Participants Participants received SC injection of 1.3 mg/m\^2 bortezomib on Days 1, 4, 8, and 11 of each 21-day cycle for the first 8 cycles, followed by \>= 9 cycles on Days 1, 8, 15, and 22 of each 35-day cycle, and received oral dose of 20 mg dexamethasone BIW on Days 1, 2, 4, 5, 8, 9, 11, and 12 of each 21-day cycle for the first 8 cycles and for cycles \>= 9 on Days 1, 2, 8, 9, 15, 16, 22, 23, 29, and 30 of each 35-day cycle until PD confirmed by the IRC, investigator or participant decision to discontinue study treatment, pregnancy, unacceptable AEs or toxicity that could not be managed by supportive care, withdrawal of consent, death, or sponsor decision to terminate the study.	SVdX Arm: Selinexor + Bortezomib + Dexamethasone Participants in the VD arm who had IRC-confirmed PD and were able to tolerate continued bortezomib treatment had crossed over to receive fixed oral dose of 100 mg selinexor tablets (5 tablets of 20 mg each) QW on Days 1, 8, 15, 22, and 29 of each 35-day cycle, along with SC injection of 1.3 mg/m\^2 bortezomib QW on Days 1, 8, 15, and 22 of each 35-day cycle, and an oral dose of 20 mg of dexamethasone BIW on Days 1, 2, 8, 9, 15, 16, 22, 23, 29, and 30 of each 35-day cycle until PD confirmed by the IRC, investigator or participant decision to discontinue study treatment, pregnancy, unacceptable AEs or toxicity that could not be managed by supportive care, withdrawal of consent, death, or sponsor decision to terminate the study.
SVd/Vd Arm: Overall Response Rate (ORR) as Assessed by IRC	76.4 Percentage of participants Interval 69.8 to 82.2	62.3 Percentage of participants Interval 55.3 to 68.9	—

SECONDARY outcome

Timeframe: From date of randomization until confirmed PD or initiating a new MM treatment (up to 33 months)

Response rate was defined as percentage of participants with responses of VGPR, at any time prior to IRC-confirmed PD or initiating a new MM treatment. VGPR: Serum and urine M-protein detectable by immunofixation but not on electrophoresis or 90% or greater reduction in serum M-protein plus urine M-protein level \< 100 mg per 24 hours.

Outcome measures

Outcome measures
Measure	SVd Arm: Selinexor + Bortezomib + Dexamethasone n=195 Participants Participants received a fixed oral dose of 100 mg selinexor tablets (5 tablets of 20 mg each) QW on Days 1, 8, 15, 22, and 29 of each 35-day cycle, along with SC injection of 1.3 mg/m\^2 bortezomib QW on Days 1, 8, 15, and 22 of each 35-day cycle, and an oral dose of 20 mg of dexamethasone BIW on Days 1, 2, 8, 9, 15, 16, 22, 23, 29, and 30 of each 35-day cycle until PD confirmed by the IRC, investigator or participant decision to discontinue study treatment, pregnancy, unacceptable AEs or toxicity that could not be managed by supportive care, withdrawal of consent, death, or sponsor decision to terminate the study.	Vd Arm: Bortezomib + Dexamethasone n=207 Participants Participants received SC injection of 1.3 mg/m\^2 bortezomib on Days 1, 4, 8, and 11 of each 21-day cycle for the first 8 cycles, followed by \>= 9 cycles on Days 1, 8, 15, and 22 of each 35-day cycle, and received oral dose of 20 mg dexamethasone BIW on Days 1, 2, 4, 5, 8, 9, 11, and 12 of each 21-day cycle for the first 8 cycles and for cycles \>= 9 on Days 1, 2, 8, 9, 15, 16, 22, 23, 29, and 30 of each 35-day cycle until PD confirmed by the IRC, investigator or participant decision to discontinue study treatment, pregnancy, unacceptable AEs or toxicity that could not be managed by supportive care, withdrawal of consent, death, or sponsor decision to terminate the study.	SVdX Arm: Selinexor + Bortezomib + Dexamethasone Participants in the VD arm who had IRC-confirmed PD and were able to tolerate continued bortezomib treatment had crossed over to receive fixed oral dose of 100 mg selinexor tablets (5 tablets of 20 mg each) QW on Days 1, 8, 15, 22, and 29 of each 35-day cycle, along with SC injection of 1.3 mg/m\^2 bortezomib QW on Days 1, 8, 15, and 22 of each 35-day cycle, and an oral dose of 20 mg of dexamethasone BIW on Days 1, 2, 8, 9, 15, 16, 22, 23, 29, and 30 of each 35-day cycle until PD confirmed by the IRC, investigator or participant decision to discontinue study treatment, pregnancy, unacceptable AEs or toxicity that could not be managed by supportive care, withdrawal of consent, death, or sponsor decision to terminate the study.
SVd/Vd Arm: Percentage of Participants With Response Rate of Very Good Partial Response (VGPR) or Better Based on IRC Assessment	44.6 Percentage of participants Interval 37.5 to 51.9	32.4 Percentage of participants Interval 26.0 to 39.2	—

SECONDARY outcome

Timeframe: From first dose of study treatment to 30 days after the last dose of study treatment inclusive, or the day before the start of new anti-MM treatment, whichever occurs first (up to 33 months)

Population: Safety population included of all participants who had received at least 1 dose of the study treatment. Data was not planned to be reported for SVdx arm and Sdx arm.

Peripheral neuropathy events was assessed using the National Cancer Institute-Common Terminology Criteria for Adverse Events (NCI-CTCAE) version 4.03. The grade ranges from Grade 1 (mild, asymptomatic, or mild symptoms) to Grade 5 (death related to an adverse event). Grade 2 indicates a moderate condition that may require minimal intervention and can limit certain daily activities. Grade 3 represents severe symptoms that are not immediately life-threatening but may lead to hospitalization and restrict self-care activities. Grade 4 denotes life-threatening consequences requiring urgent intervention. Number of participants experiencing at least one Grade \>= 2 peripheral neuropathy event have been reported.

Outcome measures

Outcome measures
Measure	SVd Arm: Selinexor + Bortezomib + Dexamethasone n=195 Participants Participants received a fixed oral dose of 100 mg selinexor tablets (5 tablets of 20 mg each) QW on Days 1, 8, 15, 22, and 29 of each 35-day cycle, along with SC injection of 1.3 mg/m\^2 bortezomib QW on Days 1, 8, 15, and 22 of each 35-day cycle, and an oral dose of 20 mg of dexamethasone BIW on Days 1, 2, 8, 9, 15, 16, 22, 23, 29, and 30 of each 35-day cycle until PD confirmed by the IRC, investigator or participant decision to discontinue study treatment, pregnancy, unacceptable AEs or toxicity that could not be managed by supportive care, withdrawal of consent, death, or sponsor decision to terminate the study.	Vd Arm: Bortezomib + Dexamethasone n=204 Participants Participants received SC injection of 1.3 mg/m\^2 bortezomib on Days 1, 4, 8, and 11 of each 21-day cycle for the first 8 cycles, followed by \>= 9 cycles on Days 1, 8, 15, and 22 of each 35-day cycle, and received oral dose of 20 mg dexamethasone BIW on Days 1, 2, 4, 5, 8, 9, 11, and 12 of each 21-day cycle for the first 8 cycles and for cycles \>= 9 on Days 1, 2, 8, 9, 15, 16, 22, 23, 29, and 30 of each 35-day cycle until PD confirmed by the IRC, investigator or participant decision to discontinue study treatment, pregnancy, unacceptable AEs or toxicity that could not be managed by supportive care, withdrawal of consent, death, or sponsor decision to terminate the study.	SVdX Arm: Selinexor + Bortezomib + Dexamethasone Participants in the VD arm who had IRC-confirmed PD and were able to tolerate continued bortezomib treatment had crossed over to receive fixed oral dose of 100 mg selinexor tablets (5 tablets of 20 mg each) QW on Days 1, 8, 15, 22, and 29 of each 35-day cycle, along with SC injection of 1.3 mg/m\^2 bortezomib QW on Days 1, 8, 15, and 22 of each 35-day cycle, and an oral dose of 20 mg of dexamethasone BIW on Days 1, 2, 8, 9, 15, 16, 22, 23, 29, and 30 of each 35-day cycle until PD confirmed by the IRC, investigator or participant decision to discontinue study treatment, pregnancy, unacceptable AEs or toxicity that could not be managed by supportive care, withdrawal of consent, death, or sponsor decision to terminate the study.
SVd/Vd Arm: Number of Participants With at Least One Grade Greater Than or Equal to [>=] 2 Peripheral Neuropathy Events	41 Participants	70 Participants	—

SECONDARY outcome

Timeframe: From date of randomization to the date of death or censored date, whichever occurred first (up to 45 months)

OS was defined as the time from the date of randomization until either the date of death due to any cause or until the participant is lost to follow-up, for all participants.

Outcome measures

Outcome measures
Measure	SVd Arm: Selinexor + Bortezomib + Dexamethasone n=195 Participants Participants received a fixed oral dose of 100 mg selinexor tablets (5 tablets of 20 mg each) QW on Days 1, 8, 15, 22, and 29 of each 35-day cycle, along with SC injection of 1.3 mg/m\^2 bortezomib QW on Days 1, 8, 15, and 22 of each 35-day cycle, and an oral dose of 20 mg of dexamethasone BIW on Days 1, 2, 8, 9, 15, 16, 22, 23, 29, and 30 of each 35-day cycle until PD confirmed by the IRC, investigator or participant decision to discontinue study treatment, pregnancy, unacceptable AEs or toxicity that could not be managed by supportive care, withdrawal of consent, death, or sponsor decision to terminate the study.	Vd Arm: Bortezomib + Dexamethasone n=207 Participants Participants received SC injection of 1.3 mg/m\^2 bortezomib on Days 1, 4, 8, and 11 of each 21-day cycle for the first 8 cycles, followed by \>= 9 cycles on Days 1, 8, 15, and 22 of each 35-day cycle, and received oral dose of 20 mg dexamethasone BIW on Days 1, 2, 4, 5, 8, 9, 11, and 12 of each 21-day cycle for the first 8 cycles and for cycles \>= 9 on Days 1, 2, 8, 9, 15, 16, 22, 23, 29, and 30 of each 35-day cycle until PD confirmed by the IRC, investigator or participant decision to discontinue study treatment, pregnancy, unacceptable AEs or toxicity that could not be managed by supportive care, withdrawal of consent, death, or sponsor decision to terminate the study.	SVdX Arm: Selinexor + Bortezomib + Dexamethasone Participants in the VD arm who had IRC-confirmed PD and were able to tolerate continued bortezomib treatment had crossed over to receive fixed oral dose of 100 mg selinexor tablets (5 tablets of 20 mg each) QW on Days 1, 8, 15, 22, and 29 of each 35-day cycle, along with SC injection of 1.3 mg/m\^2 bortezomib QW on Days 1, 8, 15, and 22 of each 35-day cycle, and an oral dose of 20 mg of dexamethasone BIW on Days 1, 2, 8, 9, 15, 16, 22, 23, 29, and 30 of each 35-day cycle until PD confirmed by the IRC, investigator or participant decision to discontinue study treatment, pregnancy, unacceptable AEs or toxicity that could not be managed by supportive care, withdrawal of consent, death, or sponsor decision to terminate the study.
SVd/Vd Arm: Overall Survival (OS)	36.67 Months Interval 30.19 to The 95% CI was not available due to insufficient numbers of participants with events.	32.76 Months Interval 27.83 to The 95% CI was not available due to insufficient numbers of participants with events.	—

SECONDARY outcome

Timeframe: From the first documentation of response to the first documentation of PD or death, whichever occurred first (up to 45 months)

DOR was defined as the duration of time from the first occurrence of an IRC confirmed response of at least (\>=) PR until the first date of IRC-confirmed PD or death due to any cause, whichever occurred first. PR: \>= 50% reduction of serum M-Protein and reduction in 24-hour urinary M-protein by \>= 90% or to \< 200 mg per 24 hours; PD: Increase of 25% from lowest confirmed response value in 1 or more of the following criteria: Serum M-protein with absolute increase of \>= 0.5 g/dL; Serum M-protein increase \>= 1 g/dL if the lowest M-component was \>= 5 g/dL; Urine M-protein (absolute increase must be \>= 200 mg per 24 hours). Analysis was performed using Kaplan-Meier method.

Outcome measures

Outcome measures
Measure	SVd Arm: Selinexor + Bortezomib + Dexamethasone n=195 Participants Participants received a fixed oral dose of 100 mg selinexor tablets (5 tablets of 20 mg each) QW on Days 1, 8, 15, 22, and 29 of each 35-day cycle, along with SC injection of 1.3 mg/m\^2 bortezomib QW on Days 1, 8, 15, and 22 of each 35-day cycle, and an oral dose of 20 mg of dexamethasone BIW on Days 1, 2, 8, 9, 15, 16, 22, 23, 29, and 30 of each 35-day cycle until PD confirmed by the IRC, investigator or participant decision to discontinue study treatment, pregnancy, unacceptable AEs or toxicity that could not be managed by supportive care, withdrawal of consent, death, or sponsor decision to terminate the study.	Vd Arm: Bortezomib + Dexamethasone n=207 Participants Participants received SC injection of 1.3 mg/m\^2 bortezomib on Days 1, 4, 8, and 11 of each 21-day cycle for the first 8 cycles, followed by \>= 9 cycles on Days 1, 8, 15, and 22 of each 35-day cycle, and received oral dose of 20 mg dexamethasone BIW on Days 1, 2, 4, 5, 8, 9, 11, and 12 of each 21-day cycle for the first 8 cycles and for cycles \>= 9 on Days 1, 2, 8, 9, 15, 16, 22, 23, 29, and 30 of each 35-day cycle until PD confirmed by the IRC, investigator or participant decision to discontinue study treatment, pregnancy, unacceptable AEs or toxicity that could not be managed by supportive care, withdrawal of consent, death, or sponsor decision to terminate the study.	SVdX Arm: Selinexor + Bortezomib + Dexamethasone Participants in the VD arm who had IRC-confirmed PD and were able to tolerate continued bortezomib treatment had crossed over to receive fixed oral dose of 100 mg selinexor tablets (5 tablets of 20 mg each) QW on Days 1, 8, 15, 22, and 29 of each 35-day cycle, along with SC injection of 1.3 mg/m\^2 bortezomib QW on Days 1, 8, 15, and 22 of each 35-day cycle, and an oral dose of 20 mg of dexamethasone BIW on Days 1, 2, 8, 9, 15, 16, 22, 23, 29, and 30 of each 35-day cycle until PD confirmed by the IRC, investigator or participant decision to discontinue study treatment, pregnancy, unacceptable AEs or toxicity that could not be managed by supportive care, withdrawal of consent, death, or sponsor decision to terminate the study.
SVd/Vd Arm: Duration of Response (DOR) as Assessed by IRC	17.28 Months Interval 12.55 to 26.25	12.88 Months Interval 9.26 to 15.77	—

SECONDARY outcome

Timeframe: From date of first SVdX treatment until disease progression or initiating a new MM treatment (up to 33 months)

Population: The SVdX population consisted of a subset of participants in the Vd arm of the safety population who crossed over from the Vd arm to SVdX treatment after IRC confirmation of PD on Vd and had received at least 1 dose of selinexor. Here, "Overall number of participants analyzed" signifies those participants who were evaluable for this outcome measure.

ORR was defined as the percentage of the participants who achieved a confirmed partial response or better (i.e., PR, VGPR, CR, or sCR) based on the IRC's response outcome assessments, according to the IMWG response criteria. PR: \>=50% reduction of serum M-Protein and reduction in 24-hour urinary M-protein by \>=90% or \<200 mg per 24 hours; VGPR: Serum and urine M-protein detectable by immunofixation but not on electrophoresis or 90% or greater reduction in serum M-protein plus urine M-protein level \<100 mg per 24 hours; CR: Negative immunofixation on the serum and urine and disappearance of any soft tissue plasmacytomas and \<=5% plasma cells in bone marrow; or sCR: CR as defined as Normal FLC ratio+ Absence of clonal cells in bone marrow biopsy by immunohistochemistry.

Outcome measures

Outcome measures
Measure	SVd Arm: Selinexor + Bortezomib + Dexamethasone n=63 Participants Participants received a fixed oral dose of 100 mg selinexor tablets (5 tablets of 20 mg each) QW on Days 1, 8, 15, 22, and 29 of each 35-day cycle, along with SC injection of 1.3 mg/m\^2 bortezomib QW on Days 1, 8, 15, and 22 of each 35-day cycle, and an oral dose of 20 mg of dexamethasone BIW on Days 1, 2, 8, 9, 15, 16, 22, 23, 29, and 30 of each 35-day cycle until PD confirmed by the IRC, investigator or participant decision to discontinue study treatment, pregnancy, unacceptable AEs or toxicity that could not be managed by supportive care, withdrawal of consent, death, or sponsor decision to terminate the study.	Vd Arm: Bortezomib + Dexamethasone Participants received SC injection of 1.3 mg/m\^2 bortezomib on Days 1, 4, 8, and 11 of each 21-day cycle for the first 8 cycles, followed by \>= 9 cycles on Days 1, 8, 15, and 22 of each 35-day cycle, and received oral dose of 20 mg dexamethasone BIW on Days 1, 2, 4, 5, 8, 9, 11, and 12 of each 21-day cycle for the first 8 cycles and for cycles \>= 9 on Days 1, 2, 8, 9, 15, 16, 22, 23, 29, and 30 of each 35-day cycle until PD confirmed by the IRC, investigator or participant decision to discontinue study treatment, pregnancy, unacceptable AEs or toxicity that could not be managed by supportive care, withdrawal of consent, death, or sponsor decision to terminate the study.	SVdX Arm: Selinexor + Bortezomib + Dexamethasone Participants in the VD arm who had IRC-confirmed PD and were able to tolerate continued bortezomib treatment had crossed over to receive fixed oral dose of 100 mg selinexor tablets (5 tablets of 20 mg each) QW on Days 1, 8, 15, 22, and 29 of each 35-day cycle, along with SC injection of 1.3 mg/m\^2 bortezomib QW on Days 1, 8, 15, and 22 of each 35-day cycle, and an oral dose of 20 mg of dexamethasone BIW on Days 1, 2, 8, 9, 15, 16, 22, 23, 29, and 30 of each 35-day cycle until PD confirmed by the IRC, investigator or participant decision to discontinue study treatment, pregnancy, unacceptable AEs or toxicity that could not be managed by supportive care, withdrawal of consent, death, or sponsor decision to terminate the study.
SVdX Arm: Overall Response Rate (ORR1) as Assessed by IRC During SVdX Treatment	19.0 Percentage of participants Interval 10.2 to 30.9	—	—

SECONDARY outcome

Timeframe: From date of first SVdX treatment until IRC-confirmed documented PD or death or censored date, whichever occurred first (up to 33 months)

PFS1 is defined as the duration of time from the date of the first dose of the SVd treatment after crossover from the Vd arm until the first date of PD or death due to any cause, whichever occurred first. PD included increase of 25% from lowest confirmed response value in 1 or more of the following criteria: a) serum M-protein with absolute increase of \>= 0.5 gram per deciliter (g/dL); b) serum M-protein increase \>= 1 g/dL if the lowest M-component was \>=5 g/dL; c) urine M-protein (absolute increase must be \>= 200 mg per 24 hours); d) in participants without measurable serum and urine M-protein levels: the difference between involved and uninvolved free light chain (FLC) levels (absolute increase must be greater than \[\>\] 10 mg/dL); e) in participants without measurable serum and urine M-protein levels and without measurable involved FLC levels: bone marrow plasma cell percentage irrespective of baseline status (absolute increase must be \>=10%).

Outcome measures

Outcome measures
Measure	SVd Arm: Selinexor + Bortezomib + Dexamethasone n=63 Participants Participants received a fixed oral dose of 100 mg selinexor tablets (5 tablets of 20 mg each) QW on Days 1, 8, 15, 22, and 29 of each 35-day cycle, along with SC injection of 1.3 mg/m\^2 bortezomib QW on Days 1, 8, 15, and 22 of each 35-day cycle, and an oral dose of 20 mg of dexamethasone BIW on Days 1, 2, 8, 9, 15, 16, 22, 23, 29, and 30 of each 35-day cycle until PD confirmed by the IRC, investigator or participant decision to discontinue study treatment, pregnancy, unacceptable AEs or toxicity that could not be managed by supportive care, withdrawal of consent, death, or sponsor decision to terminate the study.	Vd Arm: Bortezomib + Dexamethasone Participants received SC injection of 1.3 mg/m\^2 bortezomib on Days 1, 4, 8, and 11 of each 21-day cycle for the first 8 cycles, followed by \>= 9 cycles on Days 1, 8, 15, and 22 of each 35-day cycle, and received oral dose of 20 mg dexamethasone BIW on Days 1, 2, 4, 5, 8, 9, 11, and 12 of each 21-day cycle for the first 8 cycles and for cycles \>= 9 on Days 1, 2, 8, 9, 15, 16, 22, 23, 29, and 30 of each 35-day cycle until PD confirmed by the IRC, investigator or participant decision to discontinue study treatment, pregnancy, unacceptable AEs or toxicity that could not be managed by supportive care, withdrawal of consent, death, or sponsor decision to terminate the study.	SVdX Arm: Selinexor + Bortezomib + Dexamethasone Participants in the VD arm who had IRC-confirmed PD and were able to tolerate continued bortezomib treatment had crossed over to receive fixed oral dose of 100 mg selinexor tablets (5 tablets of 20 mg each) QW on Days 1, 8, 15, 22, and 29 of each 35-day cycle, along with SC injection of 1.3 mg/m\^2 bortezomib QW on Days 1, 8, 15, and 22 of each 35-day cycle, and an oral dose of 20 mg of dexamethasone BIW on Days 1, 2, 8, 9, 15, 16, 22, 23, 29, and 30 of each 35-day cycle until PD confirmed by the IRC, investigator or participant decision to discontinue study treatment, pregnancy, unacceptable AEs or toxicity that could not be managed by supportive care, withdrawal of consent, death, or sponsor decision to terminate the study.
SVdX Arm: Progression Free Survival1 (PFS1) as Assessed by IRC During SVdX Treatment	3.91 Months Interval 3.48 to 6.93	—	—

SECONDARY outcome

Timeframe: From date of randomization to start of next anti-MM treatment or death, whichever occurred first (up to 33 months)

Population: The ITT population consisted of all participants who were randomized to the study treatment, regardless of whether or not they received the study treatment. Data was not planned to be reported for SVdx arm and Sdx arm.

TTNT is defined as the duration from date of randomization to start of next anti-MM treatment or death, whichever occurs first. For patients without an event, their follow-up time will be censored at the date of discontinuation from study, or last participating visit on or before database cutoff date, whichever occurs first.

Outcome measures

Outcome measures
Measure	SVd Arm: Selinexor + Bortezomib + Dexamethasone n=195 Participants Participants received a fixed oral dose of 100 mg selinexor tablets (5 tablets of 20 mg each) QW on Days 1, 8, 15, 22, and 29 of each 35-day cycle, along with SC injection of 1.3 mg/m\^2 bortezomib QW on Days 1, 8, 15, and 22 of each 35-day cycle, and an oral dose of 20 mg of dexamethasone BIW on Days 1, 2, 8, 9, 15, 16, 22, 23, 29, and 30 of each 35-day cycle until PD confirmed by the IRC, investigator or participant decision to discontinue study treatment, pregnancy, unacceptable AEs or toxicity that could not be managed by supportive care, withdrawal of consent, death, or sponsor decision to terminate the study.	Vd Arm: Bortezomib + Dexamethasone n=207 Participants Participants received SC injection of 1.3 mg/m\^2 bortezomib on Days 1, 4, 8, and 11 of each 21-day cycle for the first 8 cycles, followed by \>= 9 cycles on Days 1, 8, 15, and 22 of each 35-day cycle, and received oral dose of 20 mg dexamethasone BIW on Days 1, 2, 4, 5, 8, 9, 11, and 12 of each 21-day cycle for the first 8 cycles and for cycles \>= 9 on Days 1, 2, 8, 9, 15, 16, 22, 23, 29, and 30 of each 35-day cycle until PD confirmed by the IRC, investigator or participant decision to discontinue study treatment, pregnancy, unacceptable AEs or toxicity that could not be managed by supportive care, withdrawal of consent, death, or sponsor decision to terminate the study.	SVdX Arm: Selinexor + Bortezomib + Dexamethasone Participants in the VD arm who had IRC-confirmed PD and were able to tolerate continued bortezomib treatment had crossed over to receive fixed oral dose of 100 mg selinexor tablets (5 tablets of 20 mg each) QW on Days 1, 8, 15, 22, and 29 of each 35-day cycle, along with SC injection of 1.3 mg/m\^2 bortezomib QW on Days 1, 8, 15, and 22 of each 35-day cycle, and an oral dose of 20 mg of dexamethasone BIW on Days 1, 2, 8, 9, 15, 16, 22, 23, 29, and 30 of each 35-day cycle until PD confirmed by the IRC, investigator or participant decision to discontinue study treatment, pregnancy, unacceptable AEs or toxicity that could not be managed by supportive care, withdrawal of consent, death, or sponsor decision to terminate the study.
SVd/Vd Arm: Time-to-next-treatment (TTNT) in Participants Randomized to the SVd and Vd Arm Who Received Treatment After SVd/Vd	16.13 Months Interval 13.93 to The 95% CI was not available due to insufficient numbers of participants with events.	10.84 Months Interval 9.82 to 13.4	—

SECONDARY outcome

Timeframe: From randomization to the date of first IRC-confirmed PR or better (i.e., PR, VGPR, CR, or sCR), whichever occurred first (up to 33 months)

Population: The ITT population consisted of all patients who were randomized to the study treatment, regardless of whether or not they received the study treatment. Here, "Overall number of participants analyzed" signifies those participants who were evaluable for this outcome measure. Data was not planned to be reported for SVdx arm and Sdx arm.

TTR was defined as duration from randomization to the date of first IRC-confirmed PR or better (i.e., PR, VGPR, CR, or sCR) before IRC-confirmed PD or initiating a new MM treatment per IMWG response criteria. The participants who do not achieve IRC-confirmed PR or better response will be censored at the date of last disease assessment on or before database cutoff date. PR: \>= 50% reduction of serum M-Protein and reduction in 24-hour urinary M-protein by \>= 90% or to \< 200 mg per 24 hours; VGPR: Serum and urine M-protein detectable by immunofixation but not on electrophoresis or 90% or greater reduction in serum M-protein plus urine M-protein level \< 100 mg per 24 hours; CR: Negative immunofixation on the serum and urine and disappearance of any soft tissue plasmacytomas and \<= 5% plasma cells in bone marrow; or sCR: Normal free light chain (FLC) ratio + Absence of clonal cells by immunohistochemistry.

Outcome measures

Outcome measures
Measure	SVd Arm: Selinexor + Bortezomib + Dexamethasone n=149 Participants Participants received a fixed oral dose of 100 mg selinexor tablets (5 tablets of 20 mg each) QW on Days 1, 8, 15, 22, and 29 of each 35-day cycle, along with SC injection of 1.3 mg/m\^2 bortezomib QW on Days 1, 8, 15, and 22 of each 35-day cycle, and an oral dose of 20 mg of dexamethasone BIW on Days 1, 2, 8, 9, 15, 16, 22, 23, 29, and 30 of each 35-day cycle until PD confirmed by the IRC, investigator or participant decision to discontinue study treatment, pregnancy, unacceptable AEs or toxicity that could not be managed by supportive care, withdrawal of consent, death, or sponsor decision to terminate the study.	Vd Arm: Bortezomib + Dexamethasone n=129 Participants Participants received SC injection of 1.3 mg/m\^2 bortezomib on Days 1, 4, 8, and 11 of each 21-day cycle for the first 8 cycles, followed by \>= 9 cycles on Days 1, 8, 15, and 22 of each 35-day cycle, and received oral dose of 20 mg dexamethasone BIW on Days 1, 2, 4, 5, 8, 9, 11, and 12 of each 21-day cycle for the first 8 cycles and for cycles \>= 9 on Days 1, 2, 8, 9, 15, 16, 22, 23, 29, and 30 of each 35-day cycle until PD confirmed by the IRC, investigator or participant decision to discontinue study treatment, pregnancy, unacceptable AEs or toxicity that could not be managed by supportive care, withdrawal of consent, death, or sponsor decision to terminate the study.	SVdX Arm: Selinexor + Bortezomib + Dexamethasone Participants in the VD arm who had IRC-confirmed PD and were able to tolerate continued bortezomib treatment had crossed over to receive fixed oral dose of 100 mg selinexor tablets (5 tablets of 20 mg each) QW on Days 1, 8, 15, 22, and 29 of each 35-day cycle, along with SC injection of 1.3 mg/m\^2 bortezomib QW on Days 1, 8, 15, and 22 of each 35-day cycle, and an oral dose of 20 mg of dexamethasone BIW on Days 1, 2, 8, 9, 15, 16, 22, 23, 29, and 30 of each 35-day cycle until PD confirmed by the IRC, investigator or participant decision to discontinue study treatment, pregnancy, unacceptable AEs or toxicity that could not be managed by supportive care, withdrawal of consent, death, or sponsor decision to terminate the study.
SVd/Vd Arm: Time To Response (TTR) in Participants Randomized to the SVd and Vd Arm	1.41 Months Interval 1.35 to 1.51	1.61 Months Interval 1.51 to 2.14	—

SECONDARY outcome

Timeframe: From date of first dose of post-SVd/Vd/SVdX treatment to the date of first PD on post-SVd/Vd/SVdX treatment, or death due to any cause (up to 33 months)

PFS 2 was defined as the duration of time from the date of the first dose of the treatment after SVd/Vd/SVdX until the first date of PD on treatment after SVd/Vd/SVdX or death due to any cause, whichever occurred first. PD included increase of 25% from lowest confirmed response value in 1 or more of the following criteria: a) serum M-protein with absolute increase of \>= 0.5 gram per deciliter (g/dL); b) serum M-protein increase \>= 1 g/dL if the lowest M-component was \>=5 g/dL; c) urine M-protein (absolute increase must be \>= 200 mg per 24 hours); d) in participants without measurable serum and urine M-protein levels: the difference between involved and uninvolved free light chain (FLC) levels (absolute increase must be greater than \[\>\] 10 mg/dL); e) in participants without measurable serum and urine M-protein levels and without measurable involved FLC levels: bone marrow plasma cell percentage irrespective of baseline status (absolute increase must be \>=10%).

Outcome measures

Outcome measures
Measure	SVd Arm: Selinexor + Bortezomib + Dexamethasone n=69 Participants Participants received a fixed oral dose of 100 mg selinexor tablets (5 tablets of 20 mg each) QW on Days 1, 8, 15, 22, and 29 of each 35-day cycle, along with SC injection of 1.3 mg/m\^2 bortezomib QW on Days 1, 8, 15, and 22 of each 35-day cycle, and an oral dose of 20 mg of dexamethasone BIW on Days 1, 2, 8, 9, 15, 16, 22, 23, 29, and 30 of each 35-day cycle until PD confirmed by the IRC, investigator or participant decision to discontinue study treatment, pregnancy, unacceptable AEs or toxicity that could not be managed by supportive care, withdrawal of consent, death, or sponsor decision to terminate the study.	Vd Arm: Bortezomib + Dexamethasone n=42 Participants Participants received SC injection of 1.3 mg/m\^2 bortezomib on Days 1, 4, 8, and 11 of each 21-day cycle for the first 8 cycles, followed by \>= 9 cycles on Days 1, 8, 15, and 22 of each 35-day cycle, and received oral dose of 20 mg dexamethasone BIW on Days 1, 2, 4, 5, 8, 9, 11, and 12 of each 21-day cycle for the first 8 cycles and for cycles \>= 9 on Days 1, 2, 8, 9, 15, 16, 22, 23, 29, and 30 of each 35-day cycle until PD confirmed by the IRC, investigator or participant decision to discontinue study treatment, pregnancy, unacceptable AEs or toxicity that could not be managed by supportive care, withdrawal of consent, death, or sponsor decision to terminate the study.	SVdX Arm: Selinexor + Bortezomib + Dexamethasone n=31 Participants Participants in the VD arm who had IRC-confirmed PD and were able to tolerate continued bortezomib treatment had crossed over to receive fixed oral dose of 100 mg selinexor tablets (5 tablets of 20 mg each) QW on Days 1, 8, 15, 22, and 29 of each 35-day cycle, along with SC injection of 1.3 mg/m\^2 bortezomib QW on Days 1, 8, 15, and 22 of each 35-day cycle, and an oral dose of 20 mg of dexamethasone BIW on Days 1, 2, 8, 9, 15, 16, 22, 23, 29, and 30 of each 35-day cycle until PD confirmed by the IRC, investigator or participant decision to discontinue study treatment, pregnancy, unacceptable AEs or toxicity that could not be managed by supportive care, withdrawal of consent, death, or sponsor decision to terminate the study.
SVd/Vd/SVdx Arm: Progression Free Survival 2 (PFS 2) in Participants Randomized to the SVd and Vd Arm Who Received Post-SVd/Vd/SVdX Treatment	6.60 Months Interval 5.39 to 9.43	8.84 Months Interval 5.78 to The 95% CI was not available due to insufficient numbers of participants with events.	3.88 Months Interval 2.79 to The 95% CI was not available due to insufficient numbers of participants with events.

SECONDARY outcome

Timeframe: Svd Arm: Baseline up to End of treatment (EOT) (at Day 820); Vd Arm: Baseline up to EOT (at Day 848)

The EORTC QLQ-CIPN20 instrument is a 20-item QoL instrument, which has been developed to elicit patients' experience of symptoms and functional limitations related to CIPN. The QLQ-CIPN20 contains 20 items assessing sensory (9 items), motor (8 items), and autonomic symptoms (3 items) containing a 4-point Likert scale (1= not at all, 2= a little, 3= quite a bit, and 4= very much), participants indicate the degree to which they have experienced sensory, motor, and autonomic symptoms during the past week. Sensory raw scale scores range from 1 to 36, motor raw scale scores range from 1 to 32, and autonomic raw scale scores range from 1 to 12 for men and 1-8 for women (erectile function item is excluded). All scale scores are linearly converted to a total score with range of 0-100 scale, with higher scores indicating more symptom burden.

Outcome measures

Outcome measures
Measure	SVd Arm: Selinexor + Bortezomib + Dexamethasone n=71 Participants Participants received a fixed oral dose of 100 mg selinexor tablets (5 tablets of 20 mg each) QW on Days 1, 8, 15, 22, and 29 of each 35-day cycle, along with SC injection of 1.3 mg/m\^2 bortezomib QW on Days 1, 8, 15, and 22 of each 35-day cycle, and an oral dose of 20 mg of dexamethasone BIW on Days 1, 2, 8, 9, 15, 16, 22, 23, 29, and 30 of each 35-day cycle until PD confirmed by the IRC, investigator or participant decision to discontinue study treatment, pregnancy, unacceptable AEs or toxicity that could not be managed by supportive care, withdrawal of consent, death, or sponsor decision to terminate the study.	Vd Arm: Bortezomib + Dexamethasone n=58 Participants Participants received SC injection of 1.3 mg/m\^2 bortezomib on Days 1, 4, 8, and 11 of each 21-day cycle for the first 8 cycles, followed by \>= 9 cycles on Days 1, 8, 15, and 22 of each 35-day cycle, and received oral dose of 20 mg dexamethasone BIW on Days 1, 2, 4, 5, 8, 9, 11, and 12 of each 21-day cycle for the first 8 cycles and for cycles \>= 9 on Days 1, 2, 8, 9, 15, 16, 22, 23, 29, and 30 of each 35-day cycle until PD confirmed by the IRC, investigator or participant decision to discontinue study treatment, pregnancy, unacceptable AEs or toxicity that could not be managed by supportive care, withdrawal of consent, death, or sponsor decision to terminate the study.	SVdX Arm: Selinexor + Bortezomib + Dexamethasone Participants in the VD arm who had IRC-confirmed PD and were able to tolerate continued bortezomib treatment had crossed over to receive fixed oral dose of 100 mg selinexor tablets (5 tablets of 20 mg each) QW on Days 1, 8, 15, 22, and 29 of each 35-day cycle, along with SC injection of 1.3 mg/m\^2 bortezomib QW on Days 1, 8, 15, and 22 of each 35-day cycle, and an oral dose of 20 mg of dexamethasone BIW on Days 1, 2, 8, 9, 15, 16, 22, 23, 29, and 30 of each 35-day cycle until PD confirmed by the IRC, investigator or participant decision to discontinue study treatment, pregnancy, unacceptable AEs or toxicity that could not be managed by supportive care, withdrawal of consent, death, or sponsor decision to terminate the study.
SVd/Vd Arm: Change From Baseline in Participant-Reported Peripheral Neuropathy (PN) Assessed by European Organization for Research and Treatment of Cancer-Quality of Life Questionnaire- Chemotherapy-Induced PN 20 (EORTC- QLQ-CIPN20) Total Scores Total Sensory Score: Change at EOT	3.38 Score on a Scale Standard Deviation 12.436	11.17 Score on a Scale Standard Deviation 19.069	—
SVd/Vd Arm: Change From Baseline in Participant-Reported Peripheral Neuropathy (PN) Assessed by European Organization for Research and Treatment of Cancer-Quality of Life Questionnaire- Chemotherapy-Induced PN 20 (EORTC- QLQ-CIPN20) Total Scores Total Motor Score: Change at EOT	3.56 Score on a Scale Standard Deviation 14.513	9.02 Score on a Scale Standard Deviation 18.662	—
SVd/Vd Arm: Change From Baseline in Participant-Reported Peripheral Neuropathy (PN) Assessed by European Organization for Research and Treatment of Cancer-Quality of Life Questionnaire- Chemotherapy-Induced PN 20 (EORTC- QLQ-CIPN20) Total Scores Total Autonomic Score: Change at EOT	10.41 Score on a Scale Standard Deviation 22.201	10.92 Score on a Scale Standard Deviation 25.306	—

Adverse Events

SVd Arm: Selinexor + Bortezomib + Dexamethasone

Serious events: 109 serious events

Other events: 193 other events

Deaths: 74 deaths

Vd Arm: Bortezomib + Dexamethasone

Serious events: 79 serious events

Other events: 197 other events

Deaths: 82 deaths

SVdX Arm: Selinexor + Bortezomib + Dexamethasone

Serious events: 28 serious events

Other events: 65 other events

Deaths: 37 deaths

SdX Arm: Selinexor + Dexamethasone

Serious events: 7 serious events

Other events: 14 other events

Deaths: 3 deaths

Serious adverse events

Other adverse events

Additional Information

Karyopharm Medical Information

Karyopharm Therapeutics Inc.

Phone: (888) 209-9326

Email: [email protected]

Results disclosure agreements

Principal investigator is a sponsor employee
Publication restrictions are in place

Restriction type: OTHER