GNAS mutation as an alternative mechanism of activation of the Wnt/ β -catenin signaling pathway in gastric adenocarcinoma of the fundic gland type by Nomura, Ryosuke, MD, Saito, Tsuyoshi, MD, PhD, Mitomi, Hiroyuki, MD, PhD, Hidaka, Yasuhiro, MD, PhD, Lee, Se-yong, MD, Watanabe, Sumio, MD, PhD, Yao, Takashi, MD, PhD

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