[Webinar] How to better optimize an oncology drug discovery program
Register for this webinar discussing how conventional and innovative integrated technological skills should be incorporated into an oncology program.
Read more Authors:
YUKI NIWA, MAKOTO ASANO, TAKAYUKI NAKAGAWA, DAMIEN FRANCE, TARO SEMBA and YASUHIRO FUNAHASHI
Abstract:
There is no established standard chemotherapy after administration of the combination endocrine plus CDK4/6 inhibitor therapy for luminal-type breast cancer. We used patient-derived xenograft (PDX) models to determine the antitumor activity of eribulin and capecitabine after endocrine therapy plus CDK4/6 inhibitor. Materials and Methods: We examined the antitumor activity of fulvestrant, palbociclib, eribulin, and capecitabine in 4 luminal-type breast cancer PDX models (OD-BRE-0188, -0438, -0450, -0745). In OD-BRE-0438, we determined the antitumor activity of chemotherapy after fulvestrant–palbociclib treatment. We also performed immunohistochemical analysis to explore the effects of treatment on E-cadherin in tumor tissues. Results: Fulvestrant, fulvestrant-palbociclib and chemotherapy had antitumor activity in the 4 PDX models. In OD-BRE-0438 (the most resistant to fulvestrant–palbociclib), eribulin had superior antitumor activity to capecitabine after fulvestrant plus palbociclib. Only eribulin tended to increase E-cadherin expression. Conclusion: Eribulin had superior antitumor activity to capecitabine after fulvestrant–palbociclib in the OD-BRE-0438 model.
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