Transformed EGFR-Positive Lung Adenocarcinoma to Squamous Cell Carcinoma

**Semantic type:** Neoplastic Process

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

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