Anderson WF, Katki HA, Rosenberg PS. Incidence of breast cancer in the United States: current and future trends. J Natl Cancer Inst. 2011;103:1397–402.PubMedCentralPubMedCrossRef
Vivanco I, Sawyers CL. The phosphatidylinositol 3-Kinase AKT pathway in human cancer. Nature Rev Cancer. 2002;2:489–501.CrossRef
Wullschleger S, Loewith R, Hall MN. TOR signaling in growth and metabolism. Cell. 2006;124:471–84.PubMedCrossRef
Ghayad SE, Cohen PA. Inhibitors of the PI3K/Akt/mTOR pathway: new hope for breast cancer patients. Recent Patents Anti-Cancer Drug Discov. 2010;5:29–57.CrossRef
Knuefermann C, Lu Y, Liu B, Jin W, Liang K, Wu L, et al. HER2/PI-3K/Akt activation leads to a multidrug resistance in human breast adenocarcinoma cells. Oncogene. 2003;22:3205–12.PubMedCrossRef
Gillham H, Golding MC, Pepperkok R, Gullick WJ. Intracellular movement of green fluorescent protein-tagged phosphatidylinositol 3-kinase in response to growth factor receptor signaling. J Cell Biol. 1999;146:869–80.PubMedCentralPubMedCrossRef
Guillermet-Guibert J, Bjorklof K, Salpekar A, Gonella C, Ramadani F, Bilancio A, et al. The p110beta isoform of phosphoinositide 3-kinase signals downstream of G protein-coupled receptors and is functionally redundant with p110gamma. Proc Natl Acad Sci U S A. 2008;105:8292–7.PubMedCentralPubMedCrossRef
Hirsch E, Katanaev VL, Garlanda C, Azzolino O, Pirola L, et al. Central role for G protein-coupled phosphoinositide 3-kinase gamma in inflammation. Science. 2000;287:1049–53.PubMedCrossRef
Geering B, Cutillas PR, Nock G, Gharbi SI, Vanhaesebroeck B. Class IA phosphoinositide 3-kinases are obligate p85-p110 heterodimers. Proc Natl Acad Sci U S A. 2007;104:7809–14.PubMedCentralPubMedCrossRef
Rordorf-Nikolic T, Van Horn DJ, Chen D, White MF, Backer JM. Regulation of phosphatidylinositol 3’-kinase by tyrosyl phosphoproteins. Full activation requires occupancy of both SH2 domains in the 85-kDa regulatory subunit. J Biol Chem. 1995;270(8):3662–6.PubMedCrossRef
Yang HW, Shin MG, Lee S, Kim JR, Park WS, Cho KH, et al. Cooperative activation of PI3K by Ras and Rho family small GTPases. Molecul Cell. 2012;47:281–90.CrossRef
Hawkins PT, Jackson TR, Stephens LR. Platelet-derived growth factor stimulates synthesis of PtdIns(3,4,5)P3 by activating a PtdIns(4,5)P2 3-OH kinase. Nature. 1992;358:157–9.PubMedCrossRef
Bertucci MC, Mitchell CA. Phosphoinositide 3-kinase and INPP4B in human breast cancer. Ann NY Acad Sci. 2013;1280:1–5. The summarized data in this review provides evidence for the role of INPP4B as a negative regulator of PI3K signaling in breast cancer.
Bellacosa A, Chan TO, Ahmed NN, Datta K, Malstrom S, Stokoe D, et al. Akt activation by growth factors is a multiple-step process: the role of the PH domain. Oncogene. 1998;17:313–25.PubMedCrossRef
Stokoe D, Stephens LR, Copeland T, Gaffney PR, Reese CB, Painter GF, et al. Dual role of phosphatidylinositol-3,4,5-trisphosphate in the activation of protein kinase B. Science 1997;277(5325):567–70.
Markman B, Atzori F, Perez-Garcia J, Tabernero J, Baselga J. Status of PI3K inhibition and biomarker development in cancer therapeutics. Ann Oncol. 2010;21:683–91.PubMedCrossRef
Sarbassov DD, Guertin DA, Ali SM, Sabatini DM. Phosphorylation and regulation of Akt/PKB by the rictor-mTOR complex. Science. 2005;307:1098–101.PubMedCrossRef
Liang J, Slingerland JM. Multiple roles of the PI3K/PKB (Akt) pathway in cell cycle progression. Cell Cycle. 2003;2:339–45.PubMedCrossRef
Ghayad SE, Vendrell JA, Ben Larbi S, Dumontet C, Bieche I, Cohen PA. Endocrine resistance associated with activated ErbB system in breast cancer cells is reversed by inhibiting MAPK or PI3K/Akt signaling pathways. Int J Cancer. 2010;126:545–62.PubMedCrossRef
Tomlinson DC, Knowles MA, Speirs V. Mechanisms of FGFR3 actions in endocrine resistant breast cancer. Int J Cancer. 2012;130:2857–66.PubMedCrossRef
Turner N, Pearson A, Sharpe R, Lambros M, Geyer F, Lopez-Garcia MA, et al. FGFR1 amplification drives endocrine therapy resistance and is a therapeutic target in breast cancer. Cancer Res. 2010;70:2085–94.PubMedCentralPubMedCrossRef
Gallardo A, Lerma E, Escuin D, Tibau A, Munoz J, Ojeda B, et al. Increased signalling of EGFR and IGF1R, and deregulation of PTEN/PI3K/Akt pathway are related with trastuzumab resistance in HER2 breast carcinomas. Br J Cancer. 2012;106:1367–73.PubMedCentralPubMedCrossRef
Zhang Y, Moerkens M, Ramaiahgari S, de Bont H, Price L, Meerman J, et al. Elevated insulin-like growth factor 1 receptor signaling induces antiestrogen resistance through the MAPK/ERK and PI3K/Akt signaling routes. Breast Cancer Res. 2011;13:R52.PubMedCentralPubMedCrossRef
Serra V, Eichhorn PJ, Garcia-Garcia C, Ibrahim YH, Prudkin L, Sanchez G, et al. RSK3/4 mediate resistance to PI3K pathway inhibitors in breast cancer. J Clin Invest. 2013;123:2551–63. This preclinical study identified the overexpression of RSK3 or RSK4 as a mechanism of resistance to PI3K/mTOR blockade in breast cancer and provides a strong rationale for combined use of PI3K- and MAPK-inhibitors.
Owens MA, Horten BC, Da Silva MM. HER2 amplification ratios by fluorescence in situ hybridization and correlation with immunohistochemistry in a cohort of 6556 breast cancer tissues. Clin Breast Cancer. 2004;5:63–9.PubMedCrossRef
Bose R, Kavuri SM, Searleman AC, Shen W, Shen D, Koboldt DC, et al. Activating HER2 mutations in HER2 gene amplification negative breast cancer. Cancer Discov. 2013;3:224–37.PubMedCentralPubMedCrossRef
Kalinsky K, Jacks LM, Heguy A, Patil S, Drobnjak M, Bhanot UK, et al. PIK3CA mutation associates with improved outcome in breast cancer. Clin Cancer Res. 2009;15:5049–59.PubMedCrossRef
Stemke-Hale K, Gonzalez-Angulo AM, Lluch A, Neve RM, Kuo WL, Davies M, et al. An integrative genomic and proteomic analysis of PIK3CA, PTEN, and AKT mutations in breast cancer. Cancer Res. 2008;68:6084–91.PubMedCentralPubMedCrossRef
Cizkova M, Susini A, Vacher S, Cizeron-Clairac G, Andrieu C, Driouch K, et al. PIK3CA mutation impact on survival in breast cancer patients and in ERalpha, PR and ERBB2-based subgroups. Breast Cancer Res. 2012;14:R28.PubMedCentralPubMedCrossRef
Loi S, Michiels S, Lambrechts D, Salgado R, Sirtaine N, Fumagalli D, et al. Tumor PIK3CA mutations, lymphocyte infiltration, and recurrence-free survival (RFS) in early breast cancer (BC): results from the FinHER trial. ASCO, Meeting Abstracts. May 30, 2012; 507.
Ramirez-Ardila DE, Helmijr JC, Look MP, Lurkin I, Ruigrok-Ritstier K, van Laere S, et al. Hotspot mutations in PIK3CA associate with first-line treatment outcome for aromatase inhibitors but not for tamoxifen. Breast Cancer Res Treat. 2013;139:39–49. This retrospective study evaluated the frequency of PIK3CA mutations in primary breast cancer samples and showed that first-line treatment of PIK3CA mutant breast cancer patients with an aromatase-inhibitor is associated with a longer time to progression when compared to wild-type.
Khan S, Kumagai T, Vora J, Bose N, Sehgal I, Koeffler PH, et al. PTEN promoter is methylated in a proportion of invasive breast cancers. Int J Cancer. 2004;112:407–10.PubMedCrossRef
Garcia JM, Silva J, Pena C, Garcia V, Rodriguez R, Cruz MA, et al. Promoter methylation of the PTEN gene is a common molecular change in breast cancer. Genes Chrom Cancer. 2004;41:117–24.PubMedCrossRef
Bose S, Wang SI, Terry MB, Hibshoosh H, Parsons R. Allelic loss of chromosome 10q23 is associated with tumor progression in breast carcinomas. Oncogene. 1998;17:123–7.PubMedCrossRef
Feilotter HE, Coulon V, McVeigh JL, Boag AH, Dorion-Bonnet F, Duboue B, et al. Analysis of the 10q23 chromosomal region and the PTEN gene in human sporadic breast carcinoma. Br J Cancer. 1999;79:718–23.PubMedCentralPubMedCrossRef
Rhei E, Kang L, Bogomolniy F, Federici MG, Borgen PI, Boyd J. Mutation analysis of the putative tumor suppressor gene PTEN/MMAC1 in primary breast carcinomas. Cancer Res. 1997;57:3657–9.PubMed
Yuan TL, Cantley LC. PI3K pathway alterations in cancer: variations on a theme. Oncogene. 2008;27:5497–510.PubMedCentralPubMedCrossRef
Carpten JD, Faber AL, Horn C, Donoho GP, Briggs SL, Robbins CM, et al. A transforming mutation in the pleckstrin homology domain of AKT1 in cancer. Nature. 2007;448:439–44.PubMedCrossRef
Maurer M, Su T, Saal LH, Koujak S, Hopkins BD, Barkley CR, et al. 3-Phosphoinositide-dependent kinase 1 potentiates upstream lesions on the phosphatidylinositol 3-kinase pathway in breast carcinoma. Cancer Res. 2009;69:6299–306.PubMedCentralPubMedCrossRef
Moja L, Tagliabue L, Balduzzi S, Parmelli E, Pistotti V, Guarneri V, et al. Trastuzumab containing regimens for early breast cancer. Cochrane Data System Rev. 2012;4, CD006243.
Baselga J, Tripathy D, Mendelsohn J, Baughman S, Benz CC, Dantis L, et al. Phase II study of weekly intravenous recombinant humanized anti-p185HER2 monoclonal antibody in patients with HER2/neu-overexpressing metastatic breast cancer. J Clin Oncol. 1996;14:737–44.PubMed
Cobleigh MA, Vogel CL, Tripathy D, Robert NJ, Scholl S, Fehrenbacher L, et al. Multinational study of the efficacy and safety of humanized anti-HER2 monoclonal antibody in women who have HER2-overexpressing metastatic breast cancer that has progressed after chemotherapy for metastatic disease. J Clin Oncol. 1999;17:2639–48.PubMed
Valabrega G, Montemurro F, Aglietta M. Trastuzumab: mechanism of action, resistance and future perspectives in HER2-overexpressing breast cancer. Ann Oncol. 2007;18:977–84.PubMedCrossRef
Scaltriti M, Rojo F, Ocana A, Anido J, Guzman M, Cortes J, et al. Expression of p95HER2, a truncated form of the HER2 receptor, and response to anti-HER2 therapies in breast cancer. J Natl Cancer Inst. 2007;99:628–38.PubMedCrossRef
Molina MA, Saez R, Ramsey EE, Garcia-Barchino MJ, Rojo F, Evans AJ, et al. NH(2)-terminal truncated HER-2 protein but not full-length receptor is associated with nodal metastasis in human breast cancer. Clin Cancer Res. 2002;8:347–53.PubMed
Price-Schiavi SA, Jepson S, Li P, Arango M, Rudland PS, Yee L, et al. Rat Muc4 (sialomucin complex) reduces binding of anti-ErbB2 antibodies to tumor cell surfaces, a potential mechanism for herceptin resistance. Int J Cancer. 2002;99:783–91.PubMedCrossRef
Wehrman TS, Raab WJ, Casipit CL, Doyonnas R, Pomerantz JH, Blau HM. A system for quantifying dynamic protein interactions defines a role for Herceptin in modulating ErbB2 interactions. Proc Natl Acad Sci U S A. 2006;103:19063–8.PubMedCentralPubMedCrossRef
Rusnak DW, Lackey K, Affleck K, Wood ER, Alligood KJ, Rhodes N, et al. The effects of the novel, reversible epidermal growth factor receptor/ErbB-2 tyrosine kinase inhibitor, GW2016, on the growth of human normal and tumor-derived cell lines in vitro and in vivo. Molec Cancer Therapeut. 2001;1:85–94.
Geyer CE, Forster J, Lindquist D, Chan S, Romieu CG, Pienkowski T, et al. Lapatinib plus capecitabine for HER2-positive advanced breast cancer. N Engl J Med. 2006;355:2733–43.PubMedCrossRef
Hanker AB, Pfefferle AD, Balko JM, Kuba MG, Young CD, Sanchez V, et al. Mutant PIK3CA accelerates HER2-driven transgenic mammary tumors and induces resistance to combinations of anti-HER2 therapies. Proc Natl Acad Sci U S A 2013;110(35):14372–7.
Berns K, Horlings HM, Hennessy BT, Madiredjo M, Hijmans EM, Beelen K, et al. A functional genetic approach identifies the PI3K pathway as a major determinant of trastuzumab resistance in breast cancer. Cancer Cell. 2007;12:395–402.PubMedCrossRef
Razis E, Bobos M, Kotoula V, Eleftheraki AG, Kalofonos HP, Pavlakis K, et al. Evaluation of the association of PIK3CA mutations and PTEN loss with efficacy of trastuzumab therapy in metastatic breast cancer. Breast Cancer Res Treat. 2011;128:447–56.PubMedCrossRef
Baselga J, Cortes J, Alm S, Clark E, Kiermaier A, Ross G, et al. Biomarker analyses in CLEOPATRA: a phase III, placebo-controlled study of pertuzumab in HER2-positive, first-line metastatic breast cancer (MBC). Cancer Res 2012;72(24 suppl):S5-1. In this placebo-controlled phase 3 trial HER2-positive metastatic breast cancer patients received trastuzumab combined with docetaxel with or without pertuzumab and the biomarker analysis identified PIK3CA mutant patients as a poor prognostic group.
Miller TW, Rexer BN, Garrett JT, Arteaga CL. Mutations in the phosphatidylinositol 3-kinase pathway: role in tumor progression and therapeutic implications in breast cancer. Breast Cancer Res. 2011;13:224.PubMedCentralPubMedCrossRef
Sokolosky ML, Stadelman KM, Chappell WH, Abrams SL, Martelli AM, Stivala F, et al. Involvement of Akt-1 and mTOR in sensitivity of breast cancer to targeted therapy. Oncotarget. 2011;2:538–50.PubMedCentralPubMed
Vilquin P, Villedieu M, Grisard E, Larbi SB, Ghayad SE, Heudel PE, et al. Molecular characterization of anastrozole resistance in breast cancer: pivotal role of the Akt/mTOR pathway in the emergence of de novo or acquired resistance and importance of combining the allosteric Akt inhibitor MK-2206 with an aromatase inhibitor. Int J Cancer, 2013;133(7):1589–602.
Yamnik RL, Digilova A, Davis DC, Brodt ZN, Murphy CJ, Holz MK. S6 kinase 1 regulates estrogen receptor alpha in control of breast cancer cell proliferation. J Biol Chem. 2009;284:6361–9.PubMedCrossRef
Yamnik RL, Holz MK. mTOR/S6K1 and MAPK/RSK signaling pathways coordinately regulate estrogen receptor alpha serine 167 phosphorylation. FEBS letters. 2010;584:124–8.PubMedCrossRef
Sarbassov DD, Ali SM, Kim DH, Guertin DA, Latek RR, Erdjument-Bromage H, et al. Rictor, a novel binding partner of mTOR, defines a rapamycin-insensitive and raptor-independent pathway that regulates the cytoskeleton. Curr Biol. 2004;14:1296–302.PubMedCrossRef
Beeram M, Tan QT, Tekmal RR, Russell D, Middleton A, DeGraffenried LA. Akt-induced endocrine therapy resistance is reversed by inhibition of mTOR signaling. Ann Oncol. 2007;18:1323–8.PubMedCrossRef
Lu CH, Wyszomierski SL, Tseng LM, Sun MH, Lan KH, Neal CL, et al. Preclinical testing of clinically applicable strategies for overcoming trastuzumab resistance caused by PTEN deficiency. Clin Cancer Res. 2007;13:5883–8.PubMedCrossRef
Liu H, Zang C, Schefe JH, Schwarzlose-Schwarck S, Regierer AC, Elstner E, et al. The mTOR inhibitor RAD001 sensitizes tumor cells to the cytotoxic effect of carboplatin in breast cancer in vitro. Anticancer Res. 2011;31:2713–22.PubMed
Baselga J, Campone M, Piccart M, Burris III HA, Rugo HS, Sahmoud T, et al. Everolimus in postmenopausal hormone-receptor-positive advanced breast cancer. N Engl J Med. 2012;366:520–9. The BOLERO-2 trial showed that advanced postmenopausal hormone-receptor-positive breast cancer patients refractory to prior aromatase-inhibitor therapy benefit from the addition of everolimus to an aromatase-inhibitor therapy in terms of increased progression free survival.
Burris III HA, Lebrun F, Rugo HS, Beck JT, Piccart M, Neven P, et al. Health-related quality of life of patients with advanced breast cancer treated with everolimus plus exemestane vs placebo plus exemestane in the phase 3, randomized, controlled, BOLERO-2 trial. Cancer. 2013;119:1908–15. The assessment of treatment effects in the BOLERO-2 trial provides evidence that the combined use of everolimus and exemestane for the treatment of advanced postmenopausal hormone-receptor-positive breast cancer patients with resistance to aromatase-inhibitors increases the time to deterioration of health-related quality of life.
Hortobagyi GN, Piccart-Gebhart MJ, Rugo HS, Burris HA, Campone M, Noguchi S, et al. Correlation of molecular alterations with efficacy of everolimus in hormone-receptor-positive (HR+), HER2-negative advanced breast cancer: preliminary results from BOLERO-2. ASCO, Meeting Abstracts. Jun 17, 2013;LBA509.
Bachelot T, Bourgier C, Cropet C, Ray-Coquard I, Ferrero JM, Freyer G, et al. Randomized phase II trial of everolimus in combination with tamoxifen in patients with hormone receptor-positive, human epidermal growth factor receptor 2-negative metastatic breast cancer with prior exposure to aromatase inhibitors: a GINECO study. J Clin Oncol. 2012;30:2718–24. Results from this trial revealed that the combination of tamoxifen and everolimus significantly increases the time to progression in postmenopausal hormone-receptor positive metastatic breast cancer patients who showed resistance to aromatase-inhibitors.
Treilleux I, Arnedos M, Cropet C, Ferrero JM, Lacourtoisie SA, Spaeth D, et al. Predictive markers of everolimus efficacy in hormone receptor positive (HR+) metastatic breast cancer (MBC): final results of the TAMRAD trial translational study. ASCO, Meeting Abstracts. Jun 17, 2013:510.
Baselga J, Semiglazov V, van Dam P, Manikhas A, Bellet M, Mayordomo J, et al. Phase II randomized study of neoadjuvant everolimus plus letrozole compared with placebo plus letrozole in patients with estrogen receptor-positive breast cancer. J Clin Oncol. 2009;27:2630–7. This study demonstrated that everolimus significantly increases the letrozole efficacy in neoadjuvant therapy of patients with operable hormone-receptor-positive breast cancer.
Shoma A, Moutamed A, Ameen M, Abdelwahab A. Ultrasound for accurate measurement of invasive breast cancer tumor size. Breast J. 2006;12:252–6.PubMedCrossRef
Wolff AC, Lazar AA, Bondarenko I, Garin AM, Brincat S, Chow L, et al. Randomized phase III placebo-controlled trial of letrozole plus oral temsirolimus as first-line endocrine therapy in postmenopausal women with locally advanced or metastatic breast cancer. J Clin Oncol. 2013;31:195–202. Results from this study revealed that the addition of temsirolimus to letrozole does not improve progression-free survival as first-line therapy in patients with aromatase-inhibitor-naive advanced breast cancer.
O’Regan RM, Ozguroglu M, Andre F, Toi M, Jerusalem G, Wilks S, et al. Phase III, randomized, double-blind, placebo-controlled multicenter trial of daily everolimus plus weekly trastuzumab and vinorelbine in trastuzumab-resistant, advanced breast cancer (BOLERO-3). ASCO, Meeting Abstracts. Jun 17, 2013:505. The BOLERO-3 trial investigated the impact of combining everolimus with vinorelbine and trastuzumab on progression-free survival in HER2-positive women with advanced breast cancer that were resistant to trastuzumab and pretreated with a taxane. Results could only demonstrate a marginal benefit for the everolimus arm thereby calling the beneficial effect of mTOR-inhibitors in HER2-positive breast cancer into question.
Blackwell KL, Miles D, Gianni L, Krop I, Welslau M, Baselga J, et al. Primary results from EMILIA, a phase III study of trastuzumab emtansine (T-DM1) vs capecitabine (X) and lapatinib (L) in HER2-positive locally advanced or metastatic breast cancer (MBC) previously treated with trastuzumab (T) and a taxane. ASCO, Meeting Abstracts. Jun 21, 2012:LBA1. According to this phase III study, trastuzumab-emtansine is more effective than the combination of capecitabine and lapatinib in terms of progression-free survival in trastuzumab-refractory HER2-positive advanced breast cancer patients.
Huober J, Fasching PA, Hanusch C, Rezai M, Eidtmann H, Kittel K, et al. Neoadjuvant chemotherapy with paclitaxel and everolimus in breast cancer patients with nonresponsive tumors to epirubicin/cyclophosphamide (EC) +/- bevacizumab - results of the randomised GeparQuinto study (GBG 44). Eur J Cancer. 2013;49:2284–93. Results from this trial showed that the combination of paclitaxel and everolimus in HER2-negative breast cancer patients nonresponsive to prior chemotherapy does not lead to an increased pathologic complete remission rate when compared to paclitaxel monotherapy.
Wan X, Harkavy B, Shen N, Grohar P, Helman LJ. Rapamycin induces feedback activation of Akt signaling through an IGF-1R-dependent mechanism. Oncogene. 2007;26:1932–40.PubMedCrossRef
O’Reilly KE, Rojo F, She QB, Solit D, Mills GB, Smith D, et al. mTOR inhibition induces upstream receptor tyrosine kinase signaling and activates Akt. Cancer Res. 2006;66:1500–8.PubMedCentralPubMedCrossRef
Meric-Bernstam F, Akcakanat A, Chen H, Do KA, Sangai T, Adkins F, et al. PIK3CA/PTEN mutations and Akt activation as markers of sensitivity to allosteric mTOR inhibitors. Clin Cancer Res. 2012;18:1777–89.PubMedCentralPubMedCrossRef
Sarbassov DD, Ali SM, Sengupta S, Sheen JH, Hsu PP, Bagley AF, et al. Prolonged rapamycin treatment inhibits mTORC2 assembly and Akt/PKB. Molec Cell. 2006;22:159–68.PubMedCrossRef
Rodrik-Outmezguine VS, Chandarlapaty S, Pagano NC, Poulikakos PI, Scaltriti M, Moskatel E, et al. mTOR kinase inhibition causes feedback-dependent biphasic regulation of AKT signaling. Cancer Discov. 2011;1:248–59.PubMedCentralPubMedCrossRef
Guichard SM, Howard Z, Heathcote D, Roth M, Hughes G, Curwen J, et al. AZD2014, a dual mTORC1 and mTORC2 inhibitor is differentiated from allosteric inhibitors of mTORC1 in ER + breast cancer. Proceedings of the 103rd Annual Meeting of the American Association for Cancer Research Chicago, IL. 2012; [Abstract #917 2012].
Thoreen CC, Kang SA, Chang JW, Liu Q, Zhang J, Gao Y, et al. An ATP-competitive mammalian target of rapamycin inhibitor reveals rapamycin-resistant functions of mTORC1. J Biol Chem. 2009;284:8023–32.PubMedCentralPubMedCrossRef
Carracedo A, Ma L, Teruya-Feldstein J, Rojo F, Salmena L, Alimonti A, et al. Inhibition of mTORC1 leads to MAPK pathway activation through a PI3K-dependent feedback loop in human cancer. J Clin Invest. 2008;118:3065–74.PubMedCentralPubMed
Sanchez CG, Ma CX, Crowder RJ, Guintoli T, Phommaly C, Gao F, et al. Preclinical modeling of combined phosphatidylinositol-3-kinase inhibition with endocrine therapy for estrogen receptor-positive breast cancer. Breast Cancer Res. 2011;13:R21.PubMedCentralPubMedCrossRef
Juvekar A, Burga LN, Hu H, Lunsford EP, Ibrahim YH, Balmana J, et al. Combining a PI3K inhibitor with a PARP inhibitor provides an effective therapy for BRCA1-related breast cancer. Cancer Discov. 2012;2:1048–63.PubMedCentralPubMedCrossRef
Kimbung S, Biskup E, Johansson I, Aaltonen K, Ottosson-Wadlund A, Gruvberger-Saal S, et al. Co-targeting of the PI3K pathway improves the response of BRCA1 deficient breast cancer cells to PARP1 inhibition. Cancer Lett. 2012;319:232–41.PubMedCrossRef
Ibrahim YH, Garcia-Garcia C, Serra V, He L, Torres-Lockhart K, Prat A, et al. PI3K inhibition impairs BRCA1/2 expression and sensitizes BRCA-proficient triple-negative breast cancer to PARP inhibition. Cancer Discov. 2012;2:1036–47.PubMedCrossRef
Bendell JC, Rodon J, Burris HA, de Jonge M, Verweij J, Birle D, et al. Phase I, dose-escalation study of BKM120, an oral pan-Class I PI3K inhibitor, in patients with advanced solid tumors. J Clin Oncol. 2012;30:282–90.PubMedCrossRef
Mayer IA, Abramson VG, Balko JM, Isakoff SJ, Kuba MG, Sanders M, et al. SU2C phase Ib study of pan-PI3K inhibitor BKM120 with letrozole in ER+/HER2- metastatic breast cancer (MBC). ASCO, Meeting Abstracts. May 30, 2012;510.
Iwata H, Baselga J, Campone M, Arteaga C, Cortes J, Jonat W, et al. Ph III randomized studies of the oral pan-PI3K inhibitor buparlisib (BKM120) with fulvestrant in postmenopausal women with HR+/HER2- locally advanced or metastatic breast cancer (BC) after aromatase inhibitor (AI; BELLE-2) or AI and mTOR inhibitor (BELLE-3) treatment. ASCO, Meeting Abstracts. Jun 17, 2013:TPS650. Results from the BELLE-2 trial might allow drawing comparison between PI3K- and mTOR-inhibition in hormone-receptor-positive advanced breast cancer patients. Results from the BELLE-3 trial are required to clarify whether advanced hormone-receptor-positive tumors with resistance to aromatase-inhibitors and mTOR-inhibitors will respond to PI3K-inhibitors.
D Juric, G Argiles, HA Burris, AM Gonzalez-Angulo, C Saura, C Quadt, et al. Phase I study of BYL719, an alpha-specific PI3K inhibitor, in patients with PIK3CA mutant advanced solid tumors: preliminary efficacy and safety in patients with PIK3CA mutant ER-positive (ER+) metastatic breast cancer (MBC). Cancer Res 2012;72(24 Suppl; abstr P6-10-07).
Jessen K, Kessler L, Kucharski J, Guo X, Staunton J, Janes M, et al. A potent and selective PI3K inhibitor, INK1117, targets human cancers harboring oncogenic PIK3CA mutations. AACR-NCI-EORTC International Conference: Molecular Targets and Cancer Therapeutics; San Francisco, CA. 2011; [Abstract A171].
Serra V, Markman B, Scaltriti M, Eichhorn PJ, Valero V, Guzman M, et al. NVP-BEZ235, a dual PI3K/mTOR inhibitor, prevents PI3K signaling and inhibits the growth of cancer cells with activating PI3K mutations. Cancer Res. 2008;68:8022–30.PubMedCrossRef
Krop I, Saura C, Ahnert JR, Becerra C, Britten CD, Isakoff SJ, et al. A phase I/IB dose-escalation study of BEZ235 in combination with trastuzumab in patients with PI3-kinase or PTEN altered HER2+ metastatic breast cancer. ASCO, Meeting Abstracts. May 30, 2012:508.
Sun M, Wang G, Paciga JE, Feldman RI, Yuan ZQ, Ma XL, et al. AKT1/PKBalpha kinase is frequently elevated in human cancers and its constitutive activation is required for oncogenic transformation in NIH3T3 cells. Am J Pathol. 2001;159:431–7.PubMedCentralPubMedCrossRef
Sun M, Paciga JE, Feldman RI, Yuan Z, Coppola D, Lu YY, et al. Phosphatidylinositol-3-OH Kinase (PI3K)/AKT2, activated in breast cancer, regulates and is induced by estrogen receptor alpha (ERalpha) via interaction between ERalpha and PI3K. Cancer Res. 2001;61:5985–91.PubMed
Nakatani K, Thompson DA, Barthel A, Sakaue H, Liu W, Weigel RJ, et al. Up-regulation of Akt3 in estrogen receptor-deficient breast cancers and androgen-independent prostate cancer lines. J Biol Chem. 1999;274:21528–32.PubMedCrossRef
Sangai T, Akcakanat A, Chen H, Tarco E, Wu Y, Do KA, et al. Biomarkers of response to Akt inhibitor MK-2206 in breast cancer. Clin Cancer Res. 2012;18:5816–28.PubMedCentralPubMedCrossRef
Gonzalez-Angulo AM, Krop I, Piha-Paul SA, Li Y, Culotta KS, Moulder-Thompson S, et al. Phase Ib Dose escalation and biomarker study of MK-2206 in combination with standard doses of weekly paclitaxel in patients with locally advanced or metastatic solid tumors with an expansion in advanced breast cancer. AACR 103rd Annual Meeting; Chicago, IL. 2012; [Abstract #LB-231].