Lipid metabolism plays an essential role in cell carcinogenesis by affecting the proliferation, migration, differentiation, and motility of cells. 1-3 Among lipid categories, phospholipids (PLs) and lysophospholipids (LPLs) are the most extensively studied. 4 The expression patterns of several PLs and LPLs reportedly differ in prostate cancer (CaP) cells 5 and tissues. 6 Recently, reports have emerged on trained canines being able to detect CaP by sniffing urine samples from these patients. 7 The odor of the urine perceived by the dogs