TriangleFOR PATIENTS · SOURCE READING
Poorly Differentiated Carcinomas
Source: Carcinoma of Unknown Primary Treatment (PDQ®)–Patient Version, National Cancer Institute.
Source updated: December 17, 2021 · Captured 2026-09-09.
Selected source text with whitespace normalised. This Triangle page is not an NCI PDQ summary. Independent clinical review is pending.
Context: Treatment of Newly Diagnosed Carcinoma of Unknown Primary
For information about the treatments listed below, see the Treatment Option Overview section.
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Cancer cells that are poorly differentiated look very different from normal cells. The type of cell they came from is not known. Treatment of poorly differentiated carcinoma of unknown primary, including tumors in the neuroendocrine system (the part of the brain that controls hormone-producing glands throughout the body) may include the following:
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Combination chemotherapy.
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A clinical trial of new types of treatment.
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Preserved source evidence · Independent clinical review pending · Not medical advice