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   Junru Ye et al, 2022, Frontiers in Oncology CrossRef
2. Role of Cytomorphology in the Era of Liquid Biopsy
   Eduardo Clery et al, 2019, Acta Cytologica CrossRef
3. Transformation of adenocarcinoma to squamous cell carcinoma as a source of EGFR-TKI resistance: A case report and literature review
   Yun-Zhu Xi et al, 2022, Frontiers in Oncology CrossRef
4. An EGFR-mutated Lung Adenocarcinoma Undergoing Squamous Cell Carcinoma Transformation Exhibited a Durable Response to Afatinib
   Mitsuo Sato et al, 2018, Internal Medicine CrossRef
5. Case Report: EGFR-Positive Early-Stage Lung Adenocarcinoma Transforming to Squamous Cell Carcinoma After TKI Treatment
   Jiatao Liao et al, 2021, Frontiers in Oncology CrossRef