PAM50 HER2-enriched Phenotype as a Predictor of Response to Dual HER2 Blockade in HER2-positive Early Breast Cancer

Summary

Non-randomized, open label, multicentric translational research study in women with untreated invasive breast carcinoma eligible for primary surgery (Stage I-IIIA). The aim of PAMELA is to test the hypothesis that PAM50 HER2-enriched (HER2-E) subtype better predicts response to neoadjuvant dual anti-HER2 blockade, with or without endocrine therapy, compared to traditional clinical HER2 classification. Furthermore, we posit that characterization of gene expression patterns may identify profiles of those who may be safely spared chemotherapy.

Timeline

Start

2013-10

Primary completion

2016-06

Completion

2017-12

Publications

• Background Baselga J, Bradbury I, Eidtmann H, Di Cosimo S, de Azambuja E, Aura C, Gomez H, Dinh P, Fauria K, Van Dooren V, Aktan G, Goldhirsch A, Chang TW, Horvath Z, Coccia-Portugal M, Domont J, Tseng LM, Kunz G, Sohn JH, Semiglazov V, Lerzo G, Palacova M, Probachai V, Pusztai L, Untch M, Gelber RD, Piccart-Gebhart M; NeoALTTO Study Team. Lapatinib with trastuzumab for HER2-positive early breast cancer (NeoALTTO): a randomised, open-label, multicentre, phase 3 trial. Lancet. 2012 Feb 18;379(9816):633-40. doi: 10.1016/S0140-6736(11)61847-3. Epub 2012 Jan 17.
• Background Gianni L, Pienkowski T, Im YH, Roman L, Tseng LM, Liu MC, Lluch A, Staroslawska E, de la Haba-Rodriguez J, Im SA, Pedrini JL, Poirier B, Morandi P, Semiglazov V, Srimuninnimit V, Bianchi G, Szado T, Ratnayake J, Ross G, Valagussa P. Efficacy and safety of neoadjuvant pertuzumab and trastuzumab in women with locally advanced, inflammatory, or early HER2-positive breast cancer (NeoSphere): a randomised multicentre, open-label, phase 2 trial. Lancet Oncol. 2012 Jan;13(1):25-32. doi: 10.1016/S1470-2045(11)70336-9. Epub 2011 Dec 6.
• Background Prat A, Parker JS, Fan C, Perou CM. PAM50 assay and the three-gene model for identifying the major and clinically relevant molecular subtypes of breast cancer. Breast Cancer Res Treat. 2012 Aug;135(1):301-6. doi: 10.1007/s10549-012-2143-0. Epub 2012 Jul 3.
• Background Rimawi MF, Mayer IA, Forero A, Nanda R, Goetz MP, Rodriguez AA, Pavlick AC, Wang T, Hilsenbeck SG, Gutierrez C, Schiff R, Osborne CK, Chang JC. Multicenter phase II study of neoadjuvant lapatinib and trastuzumab with hormonal therapy and without chemotherapy in patients with human epidermal growth factor receptor 2-overexpressing breast cancer: TBCRC 006. J Clin Oncol. 2013 May 10;31(14):1726-31. doi: 10.1200/JCO.2012.44.8027. Epub 2013 Apr 8.
• Background Cancer Genome Atlas Network. Comprehensive molecular portraits of human breast tumours. Nature. 2012 Oct 4;490(7418):61-70. doi: 10.1038/nature11412. Epub 2012 Sep 23.
• Nuciforo P, Pascual T, Cortes J, Llombart-Cussac A, Fasani R, Pare L, Oliveira M, Galvan P, Martinez N, Bermejo B, Vidal M, Pernas S, Lopez R, Munoz M, Garau I, Manso L, Alarcon J, Martinez E, Rodrik-Outmezguine V, Brase JC, Villagrasa P, Prat A, Holgado E. A predictive model of pathologic response based on tumor cellularity and tumor-infiltrating lymphocytes (CelTIL) in HER2-positive breast cancer treated with chemo-free dual HER2 blockade. Ann Oncol. 2018 Jan 1;29(1):170-177. doi: 10.1093/annonc/mdx647.
• Llombart-Cussac A, Cortes J, Pare L, Galvan P, Bermejo B, Martinez N, Vidal M, Pernas S, Lopez R, Munoz M, Nuciforo P, Morales S, Oliveira M, de la Pena L, Pelaez A, Prat A. HER2-enriched subtype as a predictor of pathological complete response following trastuzumab and lapatinib without chemotherapy in early-stage HER2-positive breast cancer (PAMELA): an open-label, single-group, multicentre, phase 2 trial. Lancet Oncol. 2017 Apr;18(4):545-554. doi: 10.1016/S1470-2045(17)30021-9. Epub 2017 Feb 24.

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