series of new seco-A ring bile acid diamides were synthesized, and their antiproliferative activities against PC3M (prostate), HT29 (colon) and ES-2 (ovarian) cancer cell lines were investigated using SRB assays. Most synthesized compounds presented improved antiproliferative activities compared to the parent bile acids (IC50 > 80 μM), especially the piperazine conjugated compound 27 with IC50 values