Durable intracranial and extracranial response to nivolumab with appearance of secondary resistance in a heavily pretreated patient with head and neck cancer

Exceptional Response to PD-1 Blockade as First-Line Therapy in Head and Neck Squamous Cell Carcinoma

The effect of PD-1 blockade as a first-line therapy in nonmetastatic head and neck squamous cell carcinoma (HNSCC) remains unknown. We report a case of an exceptional response to PD-1 blockade as a first-line therapy in a patient with HNSCC and lung cancer. A 59-year-old man presented with cheek swelling and chest pain. He was diagnosed with maxillary sinus carcinoma (squamous cell carcinoma) and lung cancer (non-small-cell lung cancer, not otherwise specified). The maxillary sinus carcinoma was completely resolved after 8 cycles of pembrolizumab. Immune checkpoint blockade warrants further evaluation in previously untreated patients with HNSCC.

Unexpected Response to Nivolumab in a "Fast Progressor" Head and Neck Cancer Patient

Prior to the advent of immune checkpoint inhibitors targeting PD-1/PD-L1 axis no drug demonstrated to improve survival or quality of life in the second-line treatment of recurrent or metastatic head and neck squamous cell carcinoma (R/M-HNSCC). Nivolumab appear to have a clear clinical benefit for R/M-HNSCC, based on improved survival, good toxicity profile, reduction in symptoms and improvement in overall quality of life. This benefit seems to be greater for PD-L1 positive patients and independent of previous treatment, even being observed among heavily pre-treated patients. However, even in responding tumors acquired resistance to nivolumab usually occurred, limiting the drug's activity. We report a case of unexpected prolonged stable disease in second-line treatment with nivolumab after a rapid progression disease under first-line chemotherapy in biomarker-positive R/M-HNSCC.