Role of chemotherapy with epidermal growth factor receptor-tyrosine kinase inhibitor (EGFR-TKI ) rechallenge in small cell transformation after EGFR-TKI failure: a case report

Background Small cell lung cancer (SCLC) transformation is one of the resistance mechanisms associated with epidermal growth factor receptor (EGFR) tyrosine kinase inhibitors (TKIs). Rechallenge with the first-line TKI after the second-line chemotherapy is suggested as a salvage treatment despite modest efficacy.