The extracts were assayed at 250 mg/mL (Fig. 5). The hexane
extracts, particularly those of the Jamaican species, demonstrated
the greatest potential to inhibit the growth of tumor cells. The
hexane extract of R. jamaicensis had the greatest overall capacity to
inhibit the progression of tumor cell growth, inhibiting colon,
breast, lung, and gastric human tumor cells by 50, 24, 54, and 37%,