ribociclib and Carcinoma--Lobular

A 59-year-old woman presented with a bone-only metastatic luminal breast cancer. She received first-line treatment with aromatase inhibitors associated with a cyclin-dependent kinase (CDK) 4/6 inhibitor, ribociclib. She developed Grade 3 elevated transaminases leading us to interrupt ribociclib permanently. Specific toxicity of the CDK 4/6 inhibitor ribociclib was retained. Once transaminase levels normalized, the patient initiated another CDK4/6 inhibitor, palbociclib, using an escalating dose without reappearance of hepatic injury. This case suggests the possibility of rechallenge after hepatic toxicity with a different CDK 4/6 inhibitor using dose escalation and careful monitoring.

Topics: Alanine Transaminase; Aminopyridines; Aromatase Inhibitors; Aspartate Aminotransferases; Bone Neoplasms; Breast Neoplasms; Carcinoma, Lobular; Chemical and Drug Induced Liver Injury; Cyclin-Dependent Kinase 4; Cyclin-Dependent Kinase 6; Drug Substitution; Drug Therapy, Combination; Female; Humans; Letrozole; Middle Aged; Piperazines; Protein Kinase Inhibitors; Purines; Pyridines

Topics: Aminopyridines; Antineoplastic Combined Chemotherapy Protocols; Aromatase Inhibitors; Benzimidazoles; Breast Neoplasms; Carcinoma, Lobular; Colonic Neoplasms; Cyclin-Dependent Kinase 4; Cyclin-Dependent Kinase 6; Female; Humans; Letrozole; Middle Aged; Neoplasm Metastasis; Piperazines; Protein Kinase Inhibitors; Purines; Pyridines; Receptor, ErbB-2; Receptors, Estrogen; Receptors, Progesterone