Multiple drugs: Pneumonitis, myopathy and lack of efficacy: case report.

A 66-year-old woman with recurrent breast cancer and pulmonary metastasis developed pneumonitis, myopathy, and lack of efficacy while undergoing treatment with various medications. Despite receiving ribociclib and fulvestrant for 8 months, her condition worsened, leading to her passing away. Autopsy results indicated ribociclib-induced pneumonitis as the likely cause of death. [Extracted from the article]