Biopsy: Although scans and exams and lab tests can be suspicious for cancer, the real proof for solid tumors is through a biopsy. For leukemia it would be a bone marrow biopsy. Additional molecular and highly specialized tests can discriminate between sub-types of cancer. One of very few exceptions is gestational choriocarcinoma which can be diagnosed accurately with a blood test and scans.
Answered 4/6/2015
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