Post-operative Radiotherapy Omission in Selected Patients With Early Breast Cancer Trial International VErsion (PROSPECTIVE)

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

RECRUITING

Clinical Phase

NA

Total Enrollment

1400 participants

Study Classification

INTERVENTIONAL

Study Start Date

2025-06-06

Study Completion Date

2039-06-30

Brief Summary

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The PROSPECTIVE trial aims to find out if using the results of Magnetic Resonance Imaging (MRI) for early breast cancer can select people to not have radiotherapy and still have a low chance of the cancer coming back after surgery.

The main question it aims to answer is:

\* Will cancer come back in the same breast as the original cancer in patients who have surgery for their breast cancer, but who don't have radiotherapy afterwards because the results of an MRI before surgery showed favourable characteristics for not having radiotherapy.

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Detailed Description

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Breast cancer is the most common serious malignancy in women and most patients are suitable for therapy involving surgery and adjuvant radiotherapy (RT). For most patients, there is a lack of evidence that breast conserving surgery without adjuvant RT is safe and therefore patients bear the costs, inconvenience and morbidity of RT. Prior attempts to identify large subsets of patients for whom RT can be safely omitted based on clinicopathological features of the index cancer have had limited success, and so RT is currently omitted only in some women over 65 or 70 with small low risk cancers. Identification of a much larger subset of patients in whom adjuvant RT could be safely omitted would be hugely significant, not only to the patients, but to the entire health system.

The ANZ 1002 PROSPECT study was a two-arm phase II study that used breast MRI findings and pathological features to identify a group of patients with low risk early breast cancer in whom RT may be safely omitted. The findings at the primary strongly support the hypothesis and suggest that the combination of preoperative MRI and pathological features can identify a substantial group of early breast cancer patients in whom adjuvant RT can be safely omitted.

A Health Economic analysis of PROSPECT found that the avoided costs of RT and its potential side effects is likely to substantially outweigh the extra cost of MRI scans and associated investigations. Parallel cross-sectional studies assessing Fear of Cancer Recurrence (FCR) and Health Related Quality of Life (HRQoL) in patients taking part in PROSPECT who either did or did not receive RT and a control group found a substantially lower FCR in PROSPECT patients who omitted RT as well as improved HRQoL.

The majority of screened and eligible patients (427/443 and 193/201, respectively) for PROSPECT were recruited from two Australian sites. Before the PROSPECT approach can be widely adopted, the findings need to be replicated in a multicentre, international study. In addition, patient reported outcomes and health economic assessments need to be performed prospectively and longitudinally.

PROSPECTIVE is the follow-up to PROSPECT which will address these issues, and also include translational research aspects to further study the natural history and outcomes of this group of lower risk early breast cancers.

Conditions

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Breast Cancer Breast Cancer Female

Study Design

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Allocation Method

NON_RANDOMIZED

Intervention Model

PARALLEL

A two-arm, non-randomised, prospective, multicentre study using MRI findings and pathology features to select patients with early breast cancer for omission of post-operative radiotherapy.

Primary Study Purpose

OTHER

Blinding Strategy

NONE

Study Groups

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Radiotherapy Omission

Participants with nil, minimal or mild parenchymal enhancement on pre-operative MRI whose pathology meets inclusion/exclusion requirements for omission of post-operative radiotherapy will be allocated to Arm A, unless the participant prefers to receive Standard Treatment (Arm B) or following clinical team recommendation.

Arm A participants will be divided into 2 groups:

* Arm A1: Grade 1 or 2/HER2 negative ("low risk")
* Arm A2: Grade 3 and/or HER2 positive ("high risk")

Group Type EXPERIMENTAL

Arm A: Radiotherapy Omission

Intervention Type RADIATION

Omission of radiotherapy based on pre-surgical MRI and pathology findings at surgery.

Standard Treatment

Participants who are found to be ineligible for RT omission on study; includes management of MRI-detected lesions.

Participants with any of:

* Moderate or marked parenchymal enhancement on pre-operative MRI
* A malignant occult lesion identified on MRI; or
* Pathology that does not meet inclusion/exclusion criteria will receive standard multidisciplinary team recommendations to guide treatment. Participants may also be included in Arm B due to their own preference or following clinical team recommendation.

Group Type ACTIVE_COMPARATOR

Arm B: Standard Treatment

Intervention Type OTHER

Ineligible for RT omission on study; includes management of MRI-detected lesions.

Interventions

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Arm A: Radiotherapy Omission

Omission of radiotherapy based on pre-surgical MRI and pathology findings at surgery.

Intervention Type RADIATION

Arm B: Standard Treatment

Ineligible for RT omission on study; includes management of MRI-detected lesions.

Intervention Type OTHER

Other Intervention Names

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A1: Grade 1 or 2/HER2 negative; A2: Grade 3 and/or HER2 positive

Eligibility Criteria

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Inclusion Criteria

For inclusion in the study at Registration, participants must fulfil all of the following criteria:

1. Has provided written, informed consent to participate in the study.
2. Female participants ≥ 50 years old with histologically\* confirmed ER-positive and/or HER2-positive invasive breast cancer.
3. Has a life expectancy of at least 10 years and suitable for prolonged follow up for 10 years.
4. Breast imaging indicating unifocal, unilateral breast cancer must have been performed before pre-registration.
5. Willing/able to have surgery within 8 weeks of registration or pre-operative MRI, whichever occurs later.
6. Have ECOG performance status 0-2.

* Oestrogen receptor and progesterone receptor status of invasive cancer will be assessed by immunohistochemistry on the diagnostic core biopsy specimen. The IHC results will be reported as percentage of nuclei stained and a score of intensity from negative, weak, intermediate or high staining

HER2 neu status will be assessed by immunohistochemistry and will be scored as follows46:

* 0 or 1+ (HER2 negative): No staining or membrane staining that is incomplete and is faint/barely perceptible and in ≤ 10% of tumour cells (0); or incomplete membrane staining that is faint/barely perceptible and in \> 10% of tumour cells (1+).
* 2+ (equivocal): weak to moderate complete membrane staining observed in \> 10% of tumour cells. Must order reflex test (same specimen using ISH) or order a new test (new specimen if available using HIS or ISH).
* 3+ (HER2 positive): Circumferential membrane staining that is complete, intense and in \> 10% of tumour cells.

1. Has moderate or marked BPE in the breast containing the index lesion on pre-operative breast MRI.
2. Has a biopsy-proven mOL identified on breast MRI.
3. Suspicious lesion identified on CEM but not on MRI and confirmed on investigation to be a DCIS or invasive breast cancer.
5. Clinical team meeting determination that RT be recommended.
6. Participant chooses to have RT despite being eligible for RT omission.

Exclusion Criteria

Any one of the following at Registration is regarded as a criterion for exclusion from the study:

1. Triple negative breast cancer (ER-negative and PR-negative and HER2-negative) where ER and PR positivity is defined as ≥ 10% staining on IHC.
2. Previous invasive breast cancer and/or DCIS in either breast.
3. Prior RT to the breast or chest.
4. Participants who plan to have a mastectomy for the index cancer.
5. Lymphovascular invasion (LVI) reported on diagnostic core biopsy.
6. Multifocal/multicentric breast cancer on breast imaging before registration.
7. Distant metastasis at diagnosis.
8. Bilateral breast cancer
9. Known breast cancer predisposition gene mutation carriers (BRCA1, BRCA2, PALB2, CHEK2, ATM, CDK1, p53, BARD1, RAD51C, RAD51D, CDH1, STK11, PTEN).
10. Contraindication to breast MRI scanning.
11. Concurrent illness/conditions which limits life expectancy to 10 years or less.
12. Has moderate or marked BPE in the breast containing the index cancer (where MRI is done before registration).
13. Inability to give informed consent.

Allocation: Arm A - Radiotherapy Omission

In addition to the above criteria, for inclusion in the omission of radiation therapy arm of the study after surgery, participants must fulfil all the following criteria. Participants not fulfilling any one of the following criterial will be allocated to Arm B:

1. Has nil/minimal or mild BPE in the breast containing the index lesion on pre-operative breast MRI.
2. BCS with unifocal\*\*, invasive primary tumour (including any surrounding DCIS) ≤ 20 mm.

The overall tumour size (including additional foci of DCIS) must remain ≤ 20 mm. The tumour size is defined as the longest distance between the outer most edges of all foci, the space between the two or more foci is included in the overall size: Size = ('Focus A + Focus B + 'the distance between A and B').
3. Radial resection margins must be ≥ 2 mm clear of any invasive cancer and ≥ 2 mm clear of any DCIS. Superficial or deep margins of \< 2 mm for invasive cancer and DCIS are allowed if there is no tumour on ink and all breast tissue from the subcutaneous tissue or pectoralis fascia respectively was removed and radial margins are ≥ 2 mm for invasive cancer and DCIS.
4. pN0 (pN0 i+ is eligible for inclusion) by sentinel node biopsy and/or axillary dissection.
5. Absence of LVI and extensive intraductal component (EIC) on final pathology.
6. The extent of invasive cancer is at least 50% of the total tumour size (invasive cancer + DCIS).
7. Have no additional BIRADS 3+ lesions not shown to be benign on pre-operative or surgical biopsy.
8. Participants with Grade 3 cancer and/or HER2-positive cancer must agree to comply with systemic treatment recommendations.
9. Participants must be allocated to a treatment arm within 8 weeks after final breast surgery.

* Where histopathology is unable to identify a 'bridge' of tumour tissue joining two or more apparent invasive cancer foci the following will be used to confirm unifocal disease:

* All foci must be of the same histological subtype
* All foci must have the same hormone (ER and PR) and HER2 status.

Allocation: Arm B - Standard Treatment (ineligible for RT omission on study; includes management of MRI-detected lesions)

Minimum Eligible Age

50 Years

Eligible Sex

FEMALE

Accepts Healthy Volunteers

No

Responsible Party

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Responsibility Role SPONSOR

Principal Investigators

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Bruce Mann, MD

Role: STUDY_CHAIR

Melbourne Health

Steven David, MD

Role: STUDY_CHAIR

Peter MacCallum Cancer Centre - Moorrabin

Alastair Thompson, MD

Role: STUDY_CHAIR

Baylor College of Medicine

Locations

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