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A Phase II Randomized Trial of Olaparib (NSC-747856) Administered Concurrently with Radiotherapy versus Radiotherapy Alone for Inflammatory Breast Cancer
To compare the Invasive Disease-Free Survival (IDFS) of patients with inflammatory breast cancer receiving concurrent administration of olaparib with standard doses of radiotherapy to the chest wall and regional lymph nodes compared to standard doses of radiotherapy alone to the chest wall and regional lymph nodes.
- Experimental: Olaparib, Radiation Therapy
- Active Comparator: Radiation Therapy
- Patients must have inflammatory breast cancer without distant metastases. All biomarker subtype groups (estrogen receptor [ER], progesterone receptor [PR], HER2) are eligible. Inflammatory disease will be defined per American Joint Committee on Cancer (AJCC) 8th edition with documentation by history/exam and pathology at the time of diagnosis.
- All patients must have completed neoadjuvant chemotherapy prior to mastectomy. The chemotherapy regimen is at the discretion of the treating physician but it is recommended that it include at least 4 cycles of anthracycline and/or taxane-based therapy (plus targeted therapy for patients with HER2+ disease). Response to chemotherapy is not a criterion for eligibility (both complete responders and those with residual disease are eligible). Please note that although pathologic complete response (pCR) is not required or excluded, pCR status must be determined post-surgery prior to randomization.
- All patients must have undergone modified radical mastectomy (with negative margins on ink) with pathologic nodal evaluation (from level I and II axillary lymph node dissection) at least 3 weeks and no more than 12 weeks prior to randomization, unless they receive additional chemotherapy after mastectomy. Patients must not have gross residual tumor or positive microscopic margins after mastectomy.
- Additional adjuvant chemotherapy after surgery is allowed at the discretion of the treating physician, either completed prior to randomization or planned for after completion of protocol treatment. If adjuvant chemotherapy is administered after mastectomy, the patient must be randomized at least 3 weeks but no more than 12 weeks after the last dose of adjuvant chemotherapy.
- Patients must not have a history of radiation therapy to the ipsilateral chest wall and/or regional nodes. Prior radiation therapy to other body sites is allowed.
- Patients must not be planning to receive any other investigational agents during radiation therapy. Prior therapy, including prior treatment with olaparib or other PARP inhibitor, is allowed.
- Patients must not have a known hypersensitivity to olaparib or any of the excipients of the product.
- Patients must not have unresolved or unstable grade 3 or greater toxicity from prior administration of another investigational drug and/or prior anti-cancer treatment.
- Patients must not be planning to receive strong or moderate CYP3A inhibitors or inducers while on olaparib treatment. Patients receiving strong or moderate CYP3A inhibitors must agree to discontinue use at least 2 weeks prior to receiving olaparib. Patients receiving strong or moderate CYP3A inducers must agree to discontinue use at least 5 weeks prior to receiving olaparib.
- Patients must not be planning to receive live virus or live bacterial vaccines while receiving olaparib and during the 30 day follow up period
- Patients must not be planning to receive any additional anti-cancer therapy (chemotherapy, endocrine therapy, immunotherapy, biological therapy or other novel agent) while receiving radiotherapy with or without study medication. If a patient is receiving concurrent anti-HER2 targeted therapies, they must not take these medications during the period of radiotherapy (with or without study drug) while enrolled on the study.