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2017 ; 389
(10075
): 1195-1205
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11 years follow-up of trastuzumab after adjuvant chemotherapy in HER2-positive
early breast cancer: final analysis of the HERceptin Adjuvant (HERA) trial
#MMPMID28215665
Cameron D
; Piccart-Gebhart MJ
; Gelber RD
; Procter M
; Goldhirsch A
; de Azambuja E
; Castro G Jr
; Untch M
; Smith I
; Gianni L
; Baselga J
; Al-Sakaff N
; Lauer S
; McFadden E
; Leyland-Jones B
; Bell R
; Dowsett M
; Jackisch C
Lancet
2017[Mar]; 389
(10075
): 1195-1205
PMID28215665
show ga
BACKGROUND: Clinical trials have shown that trastuzumab, a recombinant monoclonal
antibody against HER2 receptor, significantly improves overall survival and
disease-free survival in women with HER2-positive early breast cancer, but
long-term follow-up data are needed. We report the results of comparing
observation with two durations of trastuzumab treatment at a median follow-up of
11 years, for patients enrolled in the HERA (HERceptin Adjuvant) trial. METHODS:
HERA (BIG 1-01) is an international, multicentre, open-label, phase 3 randomised
trial of 5102 women with HER2-positive early breast cancer, who were enrolled
from hospitals in 39 countries between Dec 7, 2001, and June 20, 2005. After
completion of all primary therapy (including, surgery, chemotherapy, and
radiotherapy as indicated), patients were randomly assigned (1:1:1) to receive
trastuzumab for 1 year (once at 8 mg/kg of bodyweight intravenously, then 6 mg/kg
once every 3 weeks) or for 2 years (with the same dose schedule), or to the
observation group. Primary endpoint is disease-free survival, and analyses are in
the intention-to-treat population. Hazard ratios (HRs) were estimated from Cox
models, and survival curves were estimated by the Kaplan-Meier method. Comparison
of 2 years versus 1 year of trastuzumab is based on 366-day landmark analyses.
This study is registered with ClinicalTrials.gov (NCT00045032). FINDINGS: Of the
5102 women randomly assigned in the HERA trial, three patients had no evidence of
having provided written informed consent to participate. We followed up the
intention-to-treat population of 5099 patients (1697 in observation, 1702 in
1-year trastuzumab, and 1700 in 2-years trastuzumab groups). After a median
follow-up of 11 years (IQR 10·09-11·53), random assignment to 1 year of
trastuzumab significantly reduced the risk of a disease-free survival event (HR
0·76, 95% CI 0·68-0·86) and death (0·74, 0·64-0·86) compared with observation. 2
years of adjuvant trastuzumab did not improve disease free-survival outcomes
compared with 1 year of this drug (HR 1·02, 95% CI 0·89-1·17). Estimates of
10-year disease-free survival were 63% for observation, 69% for 1 year of
trastuzumab, and 69% for 2 years of trastuzumab. 884 (52%) patients assigned to
the observation group selectively crossed over to receive trastuzumab. Cardiac
toxicity remained low in all groups and occurred mostly during the treatment
phase. The incidence of secondary cardiac endpoints was 122 (7·3%) in the 2-years
trastuzumab group, 74 (4·4%) in the 1-year trastuzumab group, and 15 (0·9%) in
the observation group. INTERPRETATION: 1 year of adjuvant trastuzumab after
chemotherapy for patients with HER2-positive early breast cancer significantly
improves long-term disease-free survival, compared with observation. 2 years of
trastuzumab had no additional benefit. FUNDING: F Hoffmann-La Roche (Roche).
|Adult
[MESH]
|Aged
[MESH]
|Antineoplastic Agents, Immunological/*administration & dosage/adverse
effects/therapeutic use
[MESH]