Sarcoidosis-like reaction during palbociclib treatment for metastatic breast cancer: A case report.

This case report describes a 62-year-old female patient developing a granulomatous sarcoidosis-like reaction in mediastinal lymphatic nodes during a treatment by palbociclib for a metastatic breast carcinoma. After a 3-month treatment associating palbociclib, anastrozole, denosumab, and a single targeted cervical vertebral metastasis radiation therapy, a positron emission tomography showed full regression of breast, vertebral, and axillary node lesion contrasting to new emergent metabolic mediastinal lymph nodes. An endobronchial ultrasound-guided transbronchial needle aspiration revealed a sarcoidosis-like reaction, which dramatically decreased with glucocorticoids.