Establishment of preclinical chemotherapy models for gastroenteropancreatic neuroendocrine carcinoma.

Establishment of preclinical chemotherapy models for gastroenteropancreatic neuroendocrine carcinoma. Oncotarget. 2018 Apr 20;9(30):21086-21099 Authors: Ohmoto A, Suzuki M, Takai E, Rokutan H, Fujiwara Y, Morizane C, Yanagihara K, Shibata T, Yachida S Abstract Gastroenteropancreatic neuroendocrine carcinoma (GEP-NEC) is a rare and devastating malignancy, and preclinical studies are needed to evaluate potential therapeutic regimens. Here, we examined the antitumor effects of cisplatin (CDDP), etoposide (ETP) and irinotecan (CPT-11) and their combinations on GEP-NEC using three small-cell GEP-NEC cell lines (pancreatic NEC, A99; esophageal NEC, TYUC-1; duodenum NEC, TCC-NECT-2). In vitro studies were conducted using cell viability assays. In vivo experiments were conducted in mice inoculated with A99 or TCC-NECT-2 and treated with no agent, CDDP, CDDP+ETP (EP) or CDDP+CPT-11 (IP). TYUC-1 was the most susceptible to all agents, whereas A99 was refractory. Classical isobolograms showed synergism in both the EP and IP combinations for the three cell lines. In the TCC-NECT-2 mouse model, the IP regimen showed a significant antitumor effect, and CDDP alone showed a marginal effect compared to the control. In contrast, no effect was detected in the A99 model, probably because A99 was established from a metastatic tumor after chemotherapy with EP. Gene expression analysis of the ATP-binding cassette transporters revealed that ATP binding cass...
Source: Oncotarget - Category: Cancer & Oncology Tags: Oncotarget Source Type: research