Provided is a method of assisting in diagnosing pancreatic cancer or prostate cancer using a novel pancreatic cancer cell membrane surface-expressing molecule as a biomarker. A method of assisting in diagnosing pancreatic cancer or prostate cancer comprises detecting SLC45A4 protein or a nucleic acid encoding the SLC45A4 protein in a sample from a subject, wherein when the SLC45A4 protein or the nucleic acid is detected, the subject suffers from pancreatic cancer or prostate cancer, It indicates that the patient has a likelihood of suffering from. None

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