PD‐L1 expression is associated with the spontaneous regression of patients with methotrexate‐associated lymphoproliferative disorders by Yuka Gion, Misato Doi, Yoshito Nishimura, Tomoka Ikeda, Midori Filiz Nishimura, Misa Sakamoto, Yuria Egusa, Asami Nishikori, Azusa Fujita, Noriko Iwaki, Naoya Nakamura, Tadashi Yoshino, Yasuharu Sato

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