Terminology F

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FAT (ED) - Adipose tissue or an ester of glycerol. Dietary fat may contribute to prostate cancer growth.

FLUORESCENCE IN SITU HYBRIDIZATION (FISH) - Application of fluoroscently labeled DNA probes to tumor samples to define copy number of genes or chromosomes.

FREE PSA - Most PSA in the blood is bound to serum proteins. A small amount is not protein bound and is called 'free PSA'. In men with prostate cancer the ratio of free (unbound) PSA to total PSA is decreased.