EF24 shows more potent cytotoxic effect than curcumin on cancer cells. Cells were grown in 96-well plates and were treated with EF24 or curcumin as indicated for 48 h. Cell viability was assessed by the sulforhodamine B method and expressed as percentage of control (DMSO). Results with a panel of lung cancer cells are shown in a: A549, H358 (lung adenocarcinoma); H460 (large cell carcinoma); H157 (squamous cell carcinoma); and Calu-1 (lung epidermoid carcinoma). b, results with breast (MDA-MB231), cervical (HeLa), prostate (PC3), and ovarian (1A9) cancer cell lines.