Breast Cancer Clinical Trial
Official title:
Efficacy and Safety of Pyrotinib in Combination With Neoadjuvant Chemotherapy in Stage II-III HR+/HER2-, HER4 High Expression Breast Cancer Patients: A Phase II, Single-center, Randomized, Double-Blinded, Placebo-Controlled Trial
This is a Phase II, single-center, double-blind, placebo-controlled, randomized study of Pyrotinib in combination with Doxorubicin/Epirubicin and Cyclophosphamide followed by Docetaxel/nab-Paclitaxel as neoadjuvant therapy for women with hormone receptor positive HER2-negative stage II to III breast cancer. Patients randomized to the study arm/control arm will receive standard neoadjuvant chemotherapy in combination with pyrotinib/placebo, respectively. The primary endpoint of the study is the total pathological complete response (pCR) rate. Secondary endpoints include the pCR rate in breast only, objective response rate(ORR), event-free survival, overall survival, and toxicity. We will also explore potential prognostic and predictive biomarkers.
Pyrotinib is an oral, irreversible pan-ErbB receptor tyrosine kinase inhibitor (TKI) with activity against epidermal growth factor receptor HER1(EGFR), HER2 and HER4. Improvement of the chemotherapy efficacy and good tolerability have been shown by several stage II and III clinical trials in both the neoadjuvant and metastasis setting in HER2-positive breast cancers. Yet, the anti-tumor effect of Pyrotinib by targeting HER4 has not been determined. Preclinical studies show that HER4 is relatively highly expressed in hormone receptor positive and HER2-negative(HR+/HER2-) breast cancers. In MCF7 cell lines, Pyrotinib effectively repressed phosphorylation of MAPK and Akt signal transduction pathways to inhibit tumor cell proliferation. In HR+/HER2- tumor xenografts, Pyrotinib has been observed to inhibit tumor growth in a dose-dependent manner(unpublished data). Taken together, the data support the rationale that Pyrotinib may be efficacious in HER4 high expressed HR+/HER2- breast cancer and in combination with chemotherapy may lead to a better pCR rate in the neoadjuvant setting. The study is a two-arm design with a 1:1 allocation ratio (equal numbers of patients randomized to Arms 1, 2,). The sample size will be up to 140 patients with about 70 evaluable patients in each arm. Accrual is expected to occur over 24 months. Patients will be randomized to one of the two neoadjuvant therapy regimens: Patients in Arm 1 will be assigned to receive 400 mg Pyrotinib orally once per day with four cycles of epirubicin (100 mg/m2) (or doxorubicin hydrochloride liposome injection 30mg/m2) and cyclophosphamide (600 mg/m2) intravenously, once every 3 weeks, followed by four cycles of docetaxel (100 mg/m2) intravenously, once every 3 weeks(or 12 cycles of weekly nab-paclitaxel 120 mg/m2) . Dosage reduction of pyrotinib is permitted from 400 mg to 320 mg or 240 mg if Pyrotinib-related AEs are experienced. In Arm 2 (control), Pyrotinib will be replaced by 400mg placebo provided by the same pharmacy company. In all arms, clinical response will be evaluated by breast MRI. The primary endpoint will be assessed with the paraffin embedded pathological specimens collected from surgery. Submission of tumor samples for the correlative science studies will be optional for all patients. For patients who agree, pathological sections of core biopsy specimen before treatment (after the patient has signed the consent form and has been screened for eligibility) and pathological sections of surgery residual disease specimen after the completion of the treatment are collected. In addition, a blood sample collected after randomization (before the start of study therapy and after the completion of the neoadjuvant therapy) will also be required for the correlative studies. ;
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