Delta-9-THC, delta-8-THC, and cannabinol (CBN) all inhibited primary Lewis lung tumor growth, whereas cannabidiol (CBD) enhanced tumor growth. Oral administration of 25, 50, or 100 mg delta-9-THC/kg inhibited primary tumor growth by 48, 72, and 75% respectively, when measured 12 days post tumor inoculation (table 1). On day 19, mice given delta-9-THC had a 34% reduction in primary tumor size. On day 30, primary tumor size was 76% that of controls and only those given 100 mg delta-9-THC/kg had a significant increase in survival time (36%).
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