cancer, unknown primary (a metastatic malignancy whose primary source is not known). Most malignant tumors having unidentified primary sources are adenocarcinomas.

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Citation

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TY - ELEC T1 - CUP ID - 736002 Y1 - 2017 PB - Taber's Medical Dictionary UR - https://www.tabers.com/tabersonline/view/Tabers-Dictionary/736002/all/CUP ER -