患者男，46岁。因“干咳6个月”入院。查体:浅表淋巴结未及肿大。双肺呼吸音清，未闻及干湿啰音。胸部CT示右肺上叶占位性病变，纤维支气管镜在右上叶支气管开口处见新生物，活检报告为小细胞癌。对帮助诊断小细胞癌最有价值的肿瘤标志物是

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