Palbociclib safety and efficacy beyond Ribociclib-induced liver toxicity in metastatic hormone-receptors positive breast cancer patient.

CDK4/6 inhibitors in association with aromatase inhibitors have led to a paradigm shift in the management of metastatic positive hormone-receptors breast cancer. Liver toxicity is common with these agents, but no data are reported on the sequential use of these CDK4/6 inhibitors in case of confirmed efficacy and intolerable toxicity. In this article, we report the successful use of Palbociclib in a metastatic positive hormone-receptors breast cancer patient after initial response to Ribociclib, which was interrupted for grade 4 liver toxicity.