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General pathology and immunology

Cancer grading, staging, and screening logic

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SAMPLE QUESTION

A patient has a carcinoma that forms few recognizable tissue structures and is poorly differentiated. Imaging and regional node sampling identify no spread beyond the primary site. A second patient has the same type of carcinoma at the same anatomic extent, but that tumor retains well-formed structures resembling the tissue of origin.

Compared with the second tumor, which interpretation best fits the first tumor?