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The identification of biomarker-adjusted treatments has revolutionized the treatment landscape of metastatic lung cancer and improved survival for a relevant share of patients with actionable genomic alterations and those benefiting from checkpoint inhibitors (CPI). Given a clear correlation between the expression of "programmed death ligand 1" (PD-L1) and treatment efficacy of CPI, immunochemotherapy is used in patients with a PD-L1 expression <50%. The lower the PD-L1 expression, the more important is the chemotherapy backbone. For lung adenocarcinoma, there is currently a choice between pemetrexed- and taxane-based regimens. Retrospective data suggested superior survival using taxane-based treatment for patients negative for "thyroid transcription factor 1". A prospective randomized clinical trial is underway to verify this hypothesis., Competing Interests: Die Autorinnen/Autoren geben an, dass kein Interessenkonflikt besteht., (Thieme. All rights reserved.)

The case of a 58-year old female patient with epidermal growth factor-positive pulmonary adenocarcinoma treated with the tyrosine kinase inhibitor afatinib is reported. After several months of first-line therapy the patient developed severe hyponatremia and tumor reassessment revealed a progressive course of the lung cancer. Rebiopsy showed transformation of the tumor into small-cell lung cancer. Therapy with afatinib was stopped immediately and platin-based chemotherapy was started. This case shows that tumor transformation under tyrosine kinase inhibitor therapy from non-small-cell into small-cell lung cancer can occur in rare cases.