ABCG2 and gastric carcinoma: Prodigiosin, a low molecular toxin produced by Serratia marcescens, Serratia plymuthica, Hahella chejuensis, Pseudomonas magnesiorubra and Vibrio psychroerythreus has demonstrated antitumor activity in drug resistant cancer cells like A2780RCIS (MRP1,2 overexpressing human epithelial ovarian cancer cell line), EPG85- 257RNOV (BCRP overexpressing human gastric carcinoma cell line), EPG85- 257RDB (MDR1 overexpressing human gastric carcinoma cell line) (70).