Phase I Study and Biomarker Analysis of Pyrotinib, a Novel Irreversible Pan-ErbB Receptor Tyrosine Kinase Inhibitor, in Patients With Human Epidermal Growth Factor Receptor 2-Positive Metastatic Breast Cancer

Journal of Clinical Oncology : Official Journal of the American Society of Clinical Oncology
Fei MaBinghe Xu

Abstract

Purpose This phase I study assessed the safety, tolerability, pharmacokinetics, antitumor activity, and predictive biomarkers of pyrotinib, an irreversible pan-ErbB inhibitor, in patients with human epidermal growth factor receptor 2 (HER2)-positive metastatic breast cancer. Patients and Methods Pyrotinib was administered continuously, orally, once per day to patients who did not have prior exposure to tyrosine kinase inhibitors of HER2. Planned dose escalation was 80, 160, 240, 320, 400, and 480 mg. For pharmacokinetic analysis, timed blood samples were collected on day 1 and day 28. Next-generation sequencing was performed on circulating tumor DNA and genomic DNA from tumor samples. Results Thirty-eight patients were enrolled. The dose-limiting toxicity was grade 3 diarrhea, which occurred in two patients administered 480 mg of pyrotinib; thus, the maximum tolerated dose was 400 mg. Common pyrotinib-related adverse events included diarrhea (44.7% [17 of 38]), nausea (13.2% [five of 38]), oral ulceration (13.2% [five of 38]), asthenia (10.5% [four of 38]), and leukopenia (10.5% [four of 38]). The only grade 3 adverse event was diarrhea. Pharmacokinetic analyses indicated that pyrotinib exposure was dose dependent. The overall ...Continue Reading

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