A Case of Primary Lung Adenocarcinoma With Recurrent Brain Metastasis due to Transformation to Small Cell Carcinoma During Adjuvant Atezolizumab Therapy by Nao Kobayashi, Noriaki Sunaga, Masakiyo Yatomi, Ikuo Wakamatsu, Sohei Muto, Hayato Ikota, Rei Yamaguchi, Yoichi Ohtaki, Toshiteru Nagashima, Nobuteru Kubo, Tomomi Masuda, Yosuke Miura, Hiroaki Tsurumaki, Reiko Sakurai, Yasuhiko Koga, Takeshi Hisada, Toshitaka Maeno

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