Curcumin is an anti-cancer agent found in turmeric, but at doses too high for health benefit. Scientists at the Nara Institute of Science and Technology (NAIST), Japan, in collaboration with other groups in Japan and Indonesia report that a curcumin analogue, pentagamavumon-1 (PGV-1), like curcumin, arrests cancer cells in M phase of the cell cycle and inhibits enzymes that cause cell stress, but at much lower doses. These effects were seen for many cancer types.
Source: Stressing cancer with spice