PMID- 28779636 OWN - NLM STAT- MEDLINE DCOM- 20170919 LR - 20220318 IS - 1532-1967 (Electronic) IS - 0305-7372 (Linking) VI - 59 DP - 2017 Sep TI - Phosphoinositide 3-kinase (PI3K) pathway inhibitors in solid tumors: From laboratory to patients. PG - 93-101 LID - S0305-7372(17)30119-6 [pii] LID - 10.1016/j.ctrv.2017.07.005 [doi] AB - The phosphoinositide 3-kinase (PI3K) pathway is an intracellular signaling pathway that has regulatory roles in cell survival, proliferation, and differentiation, and a critical role in tumorigenesis. In cancer, multiple studies have investigated the therapeutic targeting of the PI3K pathway, and multiple inhibitors targeting PI3K and its isoforms, protein kinase B/AKT, mammalian target of rapamycin (mTOR), and other pathway proteins have been developed. For the treatment of solid tumors, only allosteric mTOR inhibitors, such as everolimus and temsirolimus, are currently approved for clinical use. This review describes the PI3K inhibitors that have progressed from the laboratory to late-stage clinical trials, and discusses the challenges that have prevented other compounds from doing the same. Challenges to the therapeutic effectiveness of some PI3K inhibitors include the absence of reliable and effective biomarkers, their limited efficacy as single agents, insufficient development of rational therapeutic combinations, the use of schedules with a variety of off-target effects, and suboptimal therapeutic exposures. Therefore, with regard to PI3K inhibitors currently in late-stage clinical trials, the identification of appropriate biomarkers of efficacy and the development of optimal combination regimens and dosing schedules are likely to be important for graduation into clinical practice. CI - Copyright (c) 2017 The Author. Published by Elsevier Ltd.. All rights reserved. FAU - Janku, Filip AU - Janku F AD - MD Anderson Cancer Center, Department of Investigational Cancer Therapeutics (Phase I Clinical Trials Program), Houston, TX, USA. Electronic address: FJanku@mdanderson.org. LA - eng PT - Journal Article PT - Review DEP - 20170718 PL - Netherlands TA - Cancer Treat Rev JT - Cancer treatment reviews JID - 7502030 RN - 0 (Protein Kinase Inhibitors) RN - 624KN6GM2T (temsirolimus) RN - 9HW64Q8G6G (Everolimus) RN - EC 2.7.1.- (Phosphatidylinositol 3-Kinases) RN - W36ZG6FT64 (Sirolimus) SB - IM MH - Animals MH - Clinical Trials, Phase II as Topic MH - *Drug Approval MH - Everolimus/therapeutic use MH - Female MH - Follow-Up Studies MH - Humans MH - Male MH - Molecular Targeted Therapy/*methods MH - Neoplasms/*drug therapy/mortality/pathology MH - Phosphatidylinositol 3-Kinases/drug effects/*genetics MH - Protein Kinase Inhibitors/pharmacology/*therapeutic use MH - Signal Transduction MH - Sirolimus/analogs & derivatives/therapeutic use MH - Survival Analysis MH - Treatment Outcome MH - United States MH - United States Food and Drug Administration OTO - NOTNLM OT - Clinical trial OT - Inhibitors OT - Laboratory OT - Lessons OT - Phosphoinositide 3-kinase OT - Solid tumors EDAT- 2017/08/06 06:00 MHDA- 2017/09/20 06:00 CRDT- 2017/08/06 06:00 PHST- 2017/04/11 00:00 [received] PHST- 2017/07/11 00:00 [revised] PHST- 2017/07/12 00:00 [accepted] PHST- 2017/08/06 06:00 [pubmed] PHST- 2017/09/20 06:00 [medline] PHST- 2017/08/06 06:00 [entrez] AID - S0305-7372(17)30119-6 [pii] AID - 10.1016/j.ctrv.2017.07.005 [doi] PST - ppublish SO - Cancer Treat Rev. 2017 Sep;59:93-101. doi: 10.1016/j.ctrv.2017.07.005. Epub 2017 Jul 18.