An advanced non-small cell lung cancer patient with epidermal growth factor receptor sensitizing mutation responded to toripalimab in combination with chemotherapy after resistance to osimertinib: a case report.

The clinical activity and favorable toxicity profile of osimertinib has led it to be approved not only for advanced non-small cell lung cancer (NSCLC) patients with T790M-positive tumors when first, or second-generation epidermal growth factor receptor-tyrosine kinase inhibitor (EGFR-TKI) treatment fails, but also for untreated advanced NSCLC patients with EGFR sensitizing mutation, so how to manage patients who get acquired resistance to osimertinib has becoming an emerging clinical challenge. This presentation would report a case of an advanced NSCLC patient with EGFR 19DEL who received combination therapy of toripalimab and chemotherapy after resistance to first line osimertinib therapy and achieved a PFS benefit of over 8 months. This case highlighted that immune checkpoint blockade combined chemotherapy might be a new possibility for advanced NSCLC patients with acquired resistance to osimertinib.