Perhexiline, a carnitine palmitoyl transferase I and free fatty acid β-oxidation blocker, did show potent inhibitory effects on cancer cell proliferation with IC50 values in the 4–20 μM range (S1 Table), whereas its IC50 values for non-cancer cells were higher, in the 30–100 μM range. The gene discussed is CPT1C; the disease is cancer.