DT2216 was synthesized in Dr. Guangrong Zheng's laboratory (University of Florida, Gainesville, FL) according to the previously described protocol (20 (link)). Gemcitabine (catalog No. S1714), 5FU (catalog No. S1209), niraparib (catalog No. S2741), A1155463 (catalog No. S7800), ABT199 (catalog No. S8048), S63845 (catalog No. S8383), and ABT263 (catalog No. S1001) were purchased from SelleckChem. All the compounds were dissolved in DMSO at 10 mmol/L stock solution for in vitro assays.