Transformed EGFR-Positive Lung Adenocarcinoma to Small Cell Carcinoma

**Semantic type:** Neoplastic Process

**Definition:** Histologic transformation of EGFR mutation-positive lung adenocarcinoma to small cell carcinoma, following treatment with tyrosine kinase inhibitors.

**Synonyms:** - Transformed EGFR-Positive Lung Adenocarcinoma to Lung Small Cell Carcinoma