A Study to Understand About the Study Medicine Palbociclib in Breast Cancer Patients After it is Out in the Japanese Market

NCT ID: NCT07096024

Last Updated: 2025-08-28

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Total Enrollment

1772 participants

Study Classification

OBSERVATIONAL

Study Start Date

2025-01-21

Study Completion Date

2025-02-07

Brief Summary

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The purpose of the study is to:

* compare the chances of getting interstitial lung disease (ILD) in new users of palbociclib plus fulvestrant to new users of fulvestrant alone (using data from before palbociclib was out in the market)
* look into the factors that can cause ILD in new users of palbociclib.

This study uses patient data without giving out any personal information of the patient. This data is taken from a hospital-based claims database of the MDV database, that includes data from more than 400 hospitals in Japan.

This study will use data of patients who are:

* diagnosed with breast cancer that include newly treated with palbociclib and/or other endocrine-based therapies for inoperable or recurrent breast cancer between 25 November 2011 and 30 November 2024.

Detailed Description

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Conditions

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Breast Neoplasms

Study Design

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Observational Model Type

COHORT

Study Time Perspective

RETROSPECTIVE

Study Groups

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New prescription of palbociclib with fulvestrant.

Patients treated with the combination of palbociclib and fulvestrant

palbociclib plus fulvestrant

Intervention Type DRUG

Patients treated with the combination of palbociclib and fulvestrant

fulvestrant

Intervention Type DRUG

Patients treated with fulvestrant alone

New prescription of fulvestrant monotherapy before the launch of palbociclib

Patients treated with fulvestrant alone

fulvestrant

Intervention Type DRUG

Patients treated with fulvestrant alone

Interventions

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palbociclib plus fulvestrant

Patients treated with the combination of palbociclib and fulvestrant

Intervention Type DRUG

fulvestrant

Patients treated with fulvestrant alone

Intervention Type DRUG

Other Intervention Names

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Ibrance fulvestrant

Eligibility Criteria

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Inclusion Criteria

* Having prescription records of drugs for endocrine therapy (aromatase inhibitors, SERDs, SERMs, and CDK4/6 inhibitors) from 25 November 2011 to 31 December 2024.
* Having any breast cancer records with definitive diagnosis in the same month as the first prescription date.
* Having any records in MDV database on or before 6 months prior to the first prescription date (\<= -180 days: first prescription date = 0 day).
* Having any records in MDV database within 6 months prior to the first prescription date (-180 days to 0 day).

Exclusion Criteria

* Having any records of anti-HER2 medication (e.g., trastuzumab, pertuzumab, lapatinib or trastuzumab emtansine) from 25 November 2011 to 31 December 2024.
* Having any records of second primary cancer with definitive diagnosis
Minimum Eligible Age

15 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

No

Sponsors

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Pfizer

INDUSTRY

Sponsor Role lead

Responsible Party

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Responsibility Role SPONSOR

Principal Investigators

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Pfizer CT.gov Call Center

Role: STUDY_DIRECTOR

Pfizer

Locations

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Pfizer New York

New York, New York, United States

Site Status

Countries

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United States

Other Identifiers

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A5481117

Identifier Type: -

Identifier Source: org_study_id

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