Abstract:
BACKGROUND:In the phase 3 MARIANNE trial, trastuzumab emtansine (T-DM1) with or without pertuzumab showed noninferior progression-free survival and better tolerability than trastuzumab plus a taxane (HT) for the first-line treatment of human epidermal growth factor receptor 2 (HER2)-positive advanced breast cancer. This article reports the final descriptive overall survival (OS) analysis, updated safety data, and additional patient-reported outcomes and biomarker analyses. METHODS:OS was assessed in 1095 patients with HER2-positive breast cancer and no prior therapy for advanced disease who had been randomized to HT, T-DM1 plus a placebo (hereafter T-DM1), or T-DM1 plus pertuzumab (T-DM1+pertuzumab). A post hoc exploratory landmark analysis of OS, baseline patient and disease characteristics, and tumor biomarkers in patients with and without an objective tumor response (OR) according to the Response Evaluation Criteria in Solid Tumors within 6.5 months of randomization was conducted. RESULTS:The median OS was similar across groups (50.9, 53.7, and 51.8 months for the HT, T-DM1, and T-DM1+pertuzumab groups, respectively). Among patients with an OR, the median OS was longer with T-DM1 (64.4 months) and T-DM1+pertuzumab (not reached) versus HT (56.3 months). No baseline characteristics or biomarkers were strongly associated with OR. The incidence of grade 3 or higher adverse events was greater with HT (55.8%) than T-DM1 (47.1%) or T-DM1+pertuzumab (48.6%). The median time to clinically meaningful deterioration (a 3-point or greater change) in neurotoxicity symptoms was shorter with HT (2.1 months) and T-DM1+pertuzumab (4.2 months) than T-DM1 (6.2 months). Fewer patients reported alopecia and diarrhea and were bothered by treatment side effects in the T-DM1 arm. CONCLUSIONS:These results support T-DM1 as a first-line treatment for patients with HER2-positive metastatic breast cancer who are deemed unsuitable for taxane-based therapy.
journal_name
Cancerjournal_title
Cancerauthors
Perez EA,Barrios C,Eiermann W,Toi M,Im YH,Conte P,Martin M,Pienkowski T,Pivot XB,Burris HA 3rd,Petersen JA,De Haas S,Hoersch S,Patre M,Ellis PAdoi
10.1002/cncr.32392subject
Has Abstractpub_date
2019-11-15 00:00:00pages
3974-3984issue
22eissn
0008-543Xissn
1097-0142journal_volume
125pub_type
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