Betulinic acid decreases expression of bcl-2 and cyclin D1, inhibits proliferation, migration and induces apoptosis in cancer cells. - Rzeski,W.; Stepulak,A.; Szymanski,M.; Sifringer,M.; Kaczor,J.; Wejksza,K.; Zdzisinska,B.; Kandefer-Szerszen,M. (Naunyn Schmiedebergs Arch Pharmacol, 2006)