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Ref Type | Journal Article |
PMID | (26920887) |
Authors | Baselga J, Lewis Phillips GD, Verma S, Ro J, Huober J, Guardino AE, Samant MK, Olsen S, de Haas SL, Pegram MD |
Title | Relationship between Tumor Biomarkers and Efficacy in EMILIA, a Phase III Study of Trastuzumab Emtansine in HER2-Positive Metastatic Breast Cancer. |
Journal | Clinical cancer research : an official journal of the American Association for Cancer Research |
Vol | 22 |
Issue | 15 |
Date | 2016 Aug 01 |
URL | |
Abstract Text | HER2-positive breast cancer is heterogeneous. Some tumors express mutations, like activating PIK3CA mutations or reduced PTEN expression, that negatively correlate with response to HER2-targeted therapies. In this exploratory analysis, we investigated whether the efficacy of trastuzumab emtansine (T-DM1), an antibody-drug conjugate comprised of the cytotoxic agent DM1 linked to the HER2-targeted antibody trastuzumab, was correlated with the expression of specific biomarkers in the phase III EMILIA study.Tumors were evaluated for HER2 (n = 866), EGFR (n = 832), and HER3 (n = 860) mRNA expression by quantitative reverse transcriptase PCR; for PTEN protein expression (n = 271) by IHC; and for PIK3CA mutations (n = 259) using a mutation detection kit. Survival outcomes were analyzed by biomarker subgroups. T-DM1 was also tested on cell lines and in breast cancer xenograft models containing PIK3CA mutations.Longer progression-free survival (PFS) and overall survival (OS) were observed with T-DM1 compared with capecitabine plus lapatinib in all biomarker subgroups. PIK3CA mutations were associated with shorter median PFS (mutant vs. wild type: 4.3 vs. 6.4 months) and OS (17.3 vs. 27.8 months) in capecitabine plus lapatinib-treated patients, but not in T-DM1-treated patients (PFS, 10.9 vs. 9.8 months; OS, not reached in mutant or wild type). T-DM1 showed potent activity in cell lines and xenograft models with PIK3CA mutations.Although other standard HER2-directed therapies are less effective in tumors with PI3KCA mutations, T-DM1 appears to be effective in both PI3KCA-mutated and wild-type tumors. Clin Cancer Res; 22(15); 3755-63. ©2016 AACR. |
Molecular Profile | Treatment Approach |
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Gene Name | Source | Synonyms | Protein Domains | Gene Description | Gene Role |
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Therapy Name | Drugs | Efficacy Evidence | Clinical Trials |
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Drug Name | Trade Name | Synonyms | Drug Classes | Drug Description |
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Gene | Variant | Impact | Protein Effect | Variant Description | Associated with drug Resistance |
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Molecular Profile | Indication/Tumor Type | Response Type | Therapy Name | Approval Status | Evidence Type | Efficacy Evidence | References |
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ERBB2 positive | Her2-receptor positive breast cancer | sensitive | Ado-trastuzumab emtansine | Phase III | Actionable | In a Phase III trial, Kadclya (trastuzumab emtansine) demonstrated improved median progression free survival and overall survival compared to Tykerb (lapatinib) and Xeloda (capecitabine) combination treatment in patients with ERBB2 (HER2) positive breast cancer, regardless of the expression level of Erbb2 (Her2), Egfr, and Her3, or PIK3CA mutation status (PMID: 26920887). | 26920887 |
ERBB2 pos PIK3CA K111N | Her2-receptor positive breast cancer | sensitive | Ado-trastuzumab emtansine | Preclinical - Cell line xenograft | Actionable | In a preclinical study, Kadcyla (trastuzumab emtansine) inhibited survival of ERBB2 (HER2) positive breast cancer cells harboring PIK3CA K111N in culture, and induced tumor regression in cell line xenograft models (PMID: 26920887). | 26920887 |
ERBB2 pos PIK3CA C420R | Her2-receptor positive breast cancer | sensitive | Ado-trastuzumab emtansine | Preclinical - Cell culture | Actionable | In a preclinical study, Kadcyla (trastuzumab emtansine) inhibited survival of ERBB2 (HER2) positive breast cancer cells harboring PIK3CA C420R in culture (PMID: 26920887). | 26920887 |
ERBB2 pos PIK3CA E545K | Her2-receptor positive breast cancer | sensitive | Ado-trastuzumab emtansine | Preclinical - Cell line xenograft | Actionable | In a preclinical study, Kadcyla (trastuzumab emtansine) inhibited survival of Herceptin (trastuzumab)-resistant ERBB2 (HER2) positive breast cancer cells harboring PIK3CA E545K in culture, and induced tumor regression in cell line xenograft models (PMID: 26920887). | 26920887 |
ERBB2 pos PIK3CA I391M | Her2-receptor positive breast cancer | sensitive | Ado-trastuzumab emtansine | Preclinical - Cell culture | Actionable | In a preclinical study, Kadcyla (trastuzumab emtansine) inhibited survival of ERBB2 (HER2) positive breast cancer cells harboring PIK3CA K111N in culture (PMID: 26920887). | 26920887 |
ERBB2 pos PIK3CA H1047R | Her2-receptor positive breast cancer | sensitive | Ado-trastuzumab emtansine | Preclinical - Cell line xenograft | Actionable | In a preclinical study, Kadcyla (trastuzumab emtansine) inhibited survival of Herceptin (trastuzumab)-resistant ERBB2 (HER2) positive breast cancer cells harboring PIK3CA H1047R in culture, and induced tumor regression in cell line xenograft models (PMID: 26920887). | 26920887 |
ERBB2 pos PIK3CA mut | Her2-receptor positive breast cancer | decreased response | Capecitabine + Lapatinib | Phase III | Actionable | In a Phase III trial, Tykerb (lapatinib) and Xeloda (capecitabine) combination treatment resulted in decreased median progression free survival (4.3 vs. 6.4 months), median overall survival (17.3 vs. 27.8 months), and overall response rate(17.1% vs. 39.7%) in ERBB2 (HER2) positive breast cancer patients harboring PIK3CA mutations compared to PIK3CA wild type patients (PMID: 26920887). | 26920887 |