Prophylactic Irradiation to the Contralateral Breast for BCAs Patients

Official title

Phase II Multicenter Clinical Trial of Prophylactic Irradiation to the Contralateral Breast for Breast Cancer Patients With BRCA1, BRCA2 and PALB2 Deleterious Mutation

Overview

Breast cancer is the most common cancer in women worldwide, with high mortality. About 5% to 10% of breast cancers are hereditary. Most inherited cases of breast cancer are associated with germline mutations in genes, such as BRCA1, BRCA2 and PALB2. The cumulative breast cancer risk for BRCA1, BRCA2 or PALB2 mutation carriers was high. Besides the increased breast cancer risk for the inherited mutation carriers, the risk of subsequent contralateral breast cancer for the mutation carriers with breast cancer was also significantly increased. Contralateral prophylactic mastectomy was usually recommended to the breast cancer patients with BRCA mutation. However, many breast cancer patients refused the contralateral prophylactic mastectomy, due to the surgical injury, potential surgical complications, deleteriously affected body image and sexuality. Solid evidence validated that radiotherapy after surgery resulted in a reduced local recurrence for three times lower than surgery alone. It is thought that radiation would eliminate the microscopic tumors which may already exist in the breast. Thus, we proposed that for the breast cancer patients with BRCA1, BRCA2 or PALB2 deleterious germline mutations, prophylactic irradiation to the contralateral breast may reduce the risk of subsequent contralateral breast cancer. And we would like to further compare the effect of prophylactic irradiation to the published data from traditional prophylactic contralateral mastectomy.

Detailed description

Breast cancer is the most common cancer in women worldwide, with high mortality. In the US in 2018, the number of estimated new cases of breast cancer accounted for 30% of all the new cancer cases in women, while the estimated deaths of breast cancer accounted for 14% of all new cancer deaths. In Chinese females, the most commonly diagnosed cancer was breast cancer, accounting for 19% of total cases. And breast cancer was the main 5 most common causes of cancer-related deaths in China.

About 5% to 10% of breast cancers are hereditary. Most inherited cases of breast cancer are associated with germline mutations in two genes: BRCA1 (BRCA1 DNA repair associated) and BRCA2 (BRCA2 DNA repair associated). The cumulative breast cancer risk for BRCA1 or BRCA2 mutation carriers at age 70 years reached as high as 50% in US population and 37% in Chinese population. Benefiting from the next generation sequencing technology, more inherited gene mutations were discovered. Among these new discovered susceptibility genes, PALB2 (Partner and localizer of BRCA2) was associated with high increased risks of breast cancer in both Chinese and US population.

Besides the increased breast cancer risk for the inherited mutation carriers, the risk of subsequent contralateral breast cancer for the mutation carriers with breast cancer was also significantly increased. For contralateral breast cancer in BRCA mutation carriers, the cumulative risk for 10 years after breast cancer diagnosis was as high as 25% and for 20 years reached to 40%, as compared 3% and 12% respectively in non-carriers. Contralateral prophylactic mastectomy was usually recommended to the breast cancer patients with BRCA mutation, as it can absolutely reduce the risk of contralateral primary cancer. However, many breast cancer patients refused the contralateral prophylactic mastectomy, due to the surgical injury, potential surgical complications, deleteriously affected body image and sexuality.

Solid evidence validated that radiotherapy after surgery resulted in a reduced local recurrence for three times lower than surgery alone. It is thought that radiation would eliminate the microscopic tumors which may already exist in the breast. Thus, we proposed that for the breast cancer patients with BRCA1, BRCA2 or PALB2 deleterious germline mutations, prophylactic irradiation to the contralateral breast may reduce the risk of subsequent contralateral breast cancer. And we would like to further compare the effect of prophylactic irradiation to the published data from traditional prophylactic contralateral mastectomy.

Interventions

• Radiation Prophylactic contralateral breast irradiation
  The whole contralateral breast will be irradiated once daily, 5 days a week, for 5-6 weeks, using 1.8-2 Gy/fx to a total dose of 45-50 Gy.

Primary outcome measures

• Contralateral breast cancer [Time frame: up to 10 years]

Secondary outcome measures (5)

• Overal survival [Time frame: up to 10 years]
• Ipsilateral loco-regional recurrence [Time frame: Every 3-6 months. Follow up will be continued until 10 years after lumpectomy or mastectomy for primary breast cancer.]
• Distant metastasis [Time frame: up to 10 years]
• Short time adverse effects [Time frame: 3 months since radiation treatment start]
• Long time adverse effects [Time frame: up to 10 years]

Eligibility criteria

Inclusion criteria

• Female patients, aged 30-70yrs, diagnosed with stage 0-III breast cancer (NCCN-Breast Cancer V2.2019), undergoing the lumpectomy or mastectomy no more than 1 year. ALND or SLNB should be carried out and the lymph node status should be known.
• Patients with a deleterious germline mutation of BRCA 1/2 or PALB2.
• The patients with no contraindictation for irradiation.
• The patients consent for prophylactic irradiation to the contralateral breast.
• The patient may receive any regimen of adjuvant, neoadjuvant chemotherapy, according to the treating physician. The radiation therapy should start at least 2 weeks after the completion of all the chemotherapy cycles.
• The patient may receive endocrine therapy before, during or after study entry.
• The patient may receive target therapy (Trastuzumab) before, during or after study entry.
• The patient must be eligible for MRI examination of the contralateral breast.
• The patient refused prophylactic contralateral mastectomy and oophorectomy.

Exclusion criteria

• Metastatic breast cancer.
• Past history of other cancer besides breast cancer
• Previous irradiation of the breast or chest wall, but not for breast cancer treatment
• Synchronous bilateral breast cancer
• Patients with active connective tissue diseases, pneumonia are excluded due to the potential risk of significant radiotherapeutic toxicity.

Criteria are shown verbatim from the registry (in English). Final eligibility is always assessed by the study center.

Healthy volunteers: No

Study design

Allocation

Randomized

Model

Parallel assignment

Masking

Triple blind

Primary purpose

Prevention

Study locations

China · 7 centers

• Department of Breast Surgery, Jiangxi Provincial Cancer Hospital — Jiangxi
• Department of Breast Surgery, Obestrics and Gynecology Hospital of Fudan University — Shanghai
• Department of Breast Surgery, Cancer Hospital of University of Chinese Academy of Sciences — Hangzhou
• Department of Breast Surgery, the First Affiliated Hospital, College of Medicine, Zhejiang — Hangzhou
• Department of Breast Surgery, the Second Affiliated Hospital, Zhejiang University School o — Hangzhou
• Department of Surgical Oncology, Sir Run Run Shaw Hospital, Zhejiang University — Hangzhou
• Department of Oncology, Zhejiang Hospital — Hangzhou

Singapore · 1 center

• Department of Breast Surgery, Yong Loo Lin School of Medicine, National University of Sing — Singapore

Identifiers

NCT: NCT04960839 · 2019-228

Primary sources (government registries)

• ClinicalTrials.gov (US NIH)

View this study on ClinicalTrials.gov ↗