PMID- 33419802 OWN - NLM STAT- MEDLINE DCOM- 20210125 LR - 20211204 IS - 1791-7530 (Electronic) IS - 0250-7005 (Linking) VI - 41 IP - 1 DP - 2021 Jan TI - Nelfinavir Inhibits the Growth of Small-cell Lung Cancer Cells and Patient-derived Xenograft Tumors. PG - 91-99 LID - 10.21873/anticanres.14754 [doi] AB - BACKGROUND/AIM: Small-cell lung cancer (SCLC) is aggressive and confers poor prognosis. Although SCLC shows more response to chemotherapy than other types of lung cancer, it is difficult to cure because of its frequent recurrence. New drugs and molecular targets need to be identified. MATERIALS AND METHODS: We investigated the effect of nelfinavir, an HIV protease inhibitor, on SCLC cells and in preclinical treatment studies using SCLC patient-derived xenograft (PDX) mouse models. RESULTS: Nelfinavir inhibited SCLC cell proliferation and induced cell death in vitro, which was caused by induction of the unfolded protein response (UPR), inhibition of mammalian/mechanistic target of rapamycin (mTOR) activation, and reduction in the expression of SCLC-related molecules such as achaete-scute homolog 1 (ASCL1). In vivo, nelfinavir inhibited the growth of SCLC PDX tumors, which correlated with the induction of UPR and reduced expression of ASCL1. CONCLUSION: Nelfinavir is highly effective in SCLC in vitro and in vivo, suggesting possible incorporation of nelfinavir into clinical trials for patients with SCLC. CI - Copyright(c) 2021, International Institute of Anticancer Research (Dr. George J. Delinasios), All rights reserved. FAU - Kawabata, Shigeru AU - Kawabata S AD - Department of Oncology, Johns Hopkins University School of Medicine, Baltimore, MD, U.S.A. pa1030@osaka-med.ac.jp. FAU - Connis, Nick AU - Connis N AD - Department of Oncology, Johns Hopkins University School of Medicine, Baltimore, MD, U.S.A. FAU - Gills, Joell J AU - Gills JJ AD - Department of Oncology, Johns Hopkins University School of Medicine, Baltimore, MD, U.S.A. FAU - Hann, Christine L AU - Hann CL AD - Department of Oncology, Johns Hopkins University School of Medicine, Baltimore, MD, U.S.A. FAU - Dennis, Phillip A AU - Dennis PA AD - Department of Oncology, Johns Hopkins University School of Medicine, Baltimore, MD, U.S.A. LA - eng PT - Journal Article PL - Greece TA - Anticancer Res JT - Anticancer research JID - 8102988 RN - 0 (Antineoplastic Agents) RN - 0 (Biomarkers) RN - EC 2.7.11.1 (TOR Serine-Threonine Kinases) RN - HO3OGH5D7I (Nelfinavir) SB - IM MH - Animals MH - Antineoplastic Agents/*pharmacology/therapeutic use MH - Biomarkers MH - Cell Line, Tumor MH - Cell Proliferation/drug effects MH - Disease Models, Animal MH - Dose-Response Relationship, Drug MH - *Drug Repositioning MH - Female MH - Humans MH - Lung Neoplasms/drug therapy/metabolism/pathology MH - Mice MH - Nelfinavir/*pharmacology/therapeutic use MH - Small Cell Lung Carcinoma/drug therapy/metabolism/pathology MH - TOR Serine-Threonine Kinases/metabolism MH - Unfolded Protein Response/drug effects MH - Xenograft Model Antitumor Assays OTO - NOTNLM OT - Small-cell lung cancer OT - nelfinavir OT - patient-derived xenograft tumors EDAT- 2021/01/10 06:00 MHDA- 2021/01/26 06:00 CRDT- 2021/01/09 05:30 PHST- 2020/10/30 00:00 [received] PHST- 2020/11/23 00:00 [accepted] PHST- 2021/01/09 05:30 [entrez] PHST- 2021/01/10 06:00 [pubmed] PHST- 2021/01/26 06:00 [medline] AID - 41/1/91 [pii] AID - 10.21873/anticanres.14754 [doi] PST - ppublish SO - Anticancer Res. 2021 Jan;41(1):91-99. doi: 10.21873/anticanres.14754.