Long-Term Efficacy of Immune Checkpoint Inhibitor for Squamous Cell Carcinoma Lesion Transformed From EGFR-Mutated Adenocarcinoma After Osimertinib Treatment: A Case Report by Shota Takahashi, MD, Yuki Sato, MD, Yoshiharu Sato, PhD, Ryosuke Hirabayashi, MD, Shigeo Hara, MD, PhD, Yutaka Takahashi, MD, PhD, Keisuke Tomii, MD, PhD

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