PMID- 24097108 OWN - NLM STAT- MEDLINE DCOM- 20140616 LR - 20211203 IS - 1531-703X (Electronic) IS - 1040-8746 (Linking) VI - 25 IP - 6 DP - 2013 Nov TI - New strategies to overcome resistance to mammalian target of rapamycin inhibitors in breast cancer. PG - 587-93 LID - 10.1097/CCO.0000000000000014 [doi] AB - PURPOSE OF REVIEW: To review the studies addressing mammalian target of rapamycin (mTOR) inhibitors in breast cancer and resistance to rapalogs. Preclinical and clinical studies have suggested mTOR inhibitors may help overcome the resistance to endocrine therapy and trastuzumab. Despite much interest, knowledge of the mechanism and molecular response to mTOR inhibitors is incomplete. RECENT FINDINGS: Resistance to mTOR inhibitors has been explored in preclinical studies and can be defined as primary, associated with amplifications or mutations of different kinases, or secondary, in which rapalog activates the feedback loops involving the insulin-like growth factor I receptor (IGF-IR), platelet-derived growth factor receptor and mitogen-activated protein kinase (MAPK) pathway. Current clinical trials are testing the combinations of rapamycin with other kinase inhibitors including IGF-IR, phosphoinositide 3-kinase and MAPK-extracellular signal-regulated kinase inhibitors. SUMMARY: Recent findings on the resistance to rapalogs have stimulated the assessment of combinations of inhibitors in clinical trials. This review summarizes the current knowledge of primary and secondary rapalog resistance, and the current efforts to overcome this resistance. FAU - Vicier, Cecile AU - Vicier C AD - aInstitut National de la Sante et de la Recherche Medicale (INSERM) U981 bDepartment of Medical Oncology, Gustave Roussy Institute (IGR), Villejuif, France. FAU - Dieci, Maria V AU - Dieci MV FAU - Andre, Fabrice AU - Andre F LA - eng PT - Journal Article PT - Review PL - United States TA - Curr Opin Oncol JT - Current opinion in oncology JID - 9007265 RN - 0 (Androstadienes) RN - 0 (Antibodies, Monoclonal, Humanized) RN - 0 (Biomarkers, Tumor) RN - 0 (Protein Kinase Inhibitors) RN - 9HW64Q8G6G (Everolimus) RN - EC 2.7.1.1 (MTOR protein, human) RN - EC 2.7.10.1 (Receptor, IGF Type 1) RN - EC 2.7.11.1 (TOR Serine-Threonine Kinases) RN - EC 2.7.11.24 (Mitogen-Activated Protein Kinases) RN - NY22HMQ4BX (exemestane) RN - P188ANX8CK (Trastuzumab) RN - W36ZG6FT64 (Sirolimus) SB - IM MH - Androstadienes/administration & dosage MH - Antibodies, Monoclonal, Humanized/administration & dosage MH - Antineoplastic Combined Chemotherapy Protocols/*therapeutic use MH - Biomarkers, Tumor/metabolism MH - Breast Neoplasms/*drug therapy/mortality/pathology MH - Clinical Trials as Topic MH - Drug Therapy, Combination MH - Everolimus MH - Female MH - Humans MH - Mitogen-Activated Protein Kinases/*drug effects MH - Molecular Targeted Therapy/*methods MH - Protein Kinase Inhibitors/*administration & dosage MH - Receptor, IGF Type 1/*drug effects MH - Signal Transduction/drug effects MH - Sirolimus/administration & dosage/analogs & derivatives MH - TOR Serine-Threonine Kinases/*antagonists & inhibitors/metabolism MH - Trastuzumab MH - Treatment Outcome EDAT- 2013/10/08 06:00 MHDA- 2014/06/17 06:00 CRDT- 2013/10/08 06:00 PHST- 2013/10/08 06:00 [entrez] PHST- 2013/10/08 06:00 [pubmed] PHST- 2014/06/17 06:00 [medline] AID - 10.1097/CCO.0000000000000014 [doi] PST - ppublish SO - Curr Opin Oncol. 2013 Nov;25(6):587-93. doi: 10.1097/CCO.0000000000000014.