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Doctors classify cancer based on its location and how the cells look under a microscope. Carcinoma of unknown primary location is the diagnosis when doctors cannot identify the location where the cancer cells started.
At Mayo Clinic, doctors who specialize in medical cancer treatment (oncology), radiation therapy for cancer (radiation oncology), surgery, radiology and the study of tissue samples for signs of disease (pathology) care for people who have this cancer.
Many people who are diagnosed with carcinoma of unknown primary location are referred to Mayo Clinic because the cancer's original location cannot be found. In most cases, Mayo Clinic doctors are able to recommend specific treatment for these cancers.
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