Abstract 3608
Background
High BMI has been repeatedly identified as a risk factor for breast cancer (BC), but also as an adverse prognostic factor in women with early-stage BC. Little is known about its impact on outcome in patients with metastatic BC (MBC).
Methods
We used the National ESME-MBC cohort, which includes all consecutive patients (pts) newly diagnosed with MBC between Jan 2008 and Dec 2016 in 18 French comprehensive cancer centres. Women with available BMI at the diagnosis of MBC were selected. Four groups were defined according to WHO classification: underweight (BMI < 18.5 kg/m2), normal weight (18.5-24.9), overweight (25.0-29.9) and obese (≥30.0). Multivariate Cox analyses for OS were conducted in the whole population (primary objective). OS and 1st line progression-free survival (PFS) in subtypes (HER2+, Triple negative BC (TNBC) and HR+ HER2-) were secondary objectives.
Results
Of 22 463 patients in the ESME cohort, 12 999 women had BMI data available. Med BMI was 24.9 kg/m2 (range 12.1-66.5). Pts characteristics are reported in Table. Obesity was associated with more de novo MBC, while underweight pts had more aggressive features. Median follow-up was 48.6 months. Median OS was 47.4 months (95% CI [46.2-48.5]). By multivariate analysis, age, visceral metastases, time to MBC, number of metastatic sites, tumor subtype and BMI were independent predictors for OS. Underweight (but not overweight or obesity) was associated with a worse prognosis (HR 1.29, 95%CI [1.16-1.44]), and this was true in each tumour subtype. Median 1st line PFS was 12.2 months, with similar multivariate results.Table:
367P
Underweight | Normal weight | Overweight | Obese | p | |
---|---|---|---|---|---|
N | 637 (5%) | 6020 (46%) | 3708 (29%) | 2634 (20%) | |
Age at MBC diagnosis (med) | 58 | 58 | 61 | 60 | <0.001 |
De novo MBC | 228 (36%) | 1939 (32%) | 1389 (37%) | 1132 (43%) | 0.000 |
Time to MBC (med, months) | 24 | 33 | 27 | 18 | <0.001 |
Visceral metastases | 400 (63%) | 3543 (59%) | 2148 (58%) | 1484 (56%) | 0.012 |
Subtype HR+HER2- | 354 (56%) | 3566 (59%) | 2311 (62%) | 1633 (62%) | 0.000 |
HER2+ | 131 (21%) | 1295 (21%) | 725 (20%) | 545 (21%) | |
TNBC | 105 (16%) | 860 (14%) | 499 (13%) | 345 (13%) | |
>3 metastatic sites | 180 (28%) | 1306 (22%) | 753 (20%) | 553 (21%) | 0.000 |
Median OS (95% CI) | 33 (29-40) | 47 (45-49) | 49 (47-51) | 48 (45-51) |
Conclusions
Unlike in early-stage BC, overweight and obesity do not seem associated with poorer OS in MBC women, whatever the subtype, on the opposite of underweight.
Clinical trial identification
Editorial acknowledgement
Legal entity responsible for the study
The authors.
Funding
Has not received any funding.
Disclosure
M. Robain: Research grant / Funding (institution), ESME plateform support: Roche; Research grant / Funding (institution), ESME plateform support: AstraZeneca; Research grant / Funding (institution), ESME plateform support: Pfizer; Research grant / Funding (institution), ESME plateform support: BMS; Research grant / Funding (institution), ESME plateform support: DAIICHI Sankyo. All other authors have declared no conflicts of interest.
Resources from the same session
5489 - Local immune status in cancer cell nests can be a predictor of survival for rectal cancer with neoadjuvant radiotherapy
Presenter: xijin lin
Session: Poster Display session 2
Resources:
Abstract
1653 - Impact of concomitant medications on disease free survival (DFS) and overall survival (OS) in patients from the PETACC8 study.
Presenter: Clémence Brun
Session: Poster Display session 2
Resources:
Abstract
5206 - Updated results of NORDIC 8, a randomised trial of cetuximab every 2 weeks with FOLFIRI or cetuximab with alternating FOLFIRI/FOLFOX in patients with RAS and BRAF wild type metastatic colorectal cancer.
Presenter: Per Pfeiffer
Session: Poster Display session 2
Resources:
Abstract
2992 - Clinical impact of mucinous and poorly differentiated tumors on the outcome of patients with stage II colon cancer: a TOSCA subgroup analysis
Presenter: Gerardo Rosati
Session: Poster Display session 2
Resources:
Abstract
4753 - Exercise improved adjuvant treatment completion rates and treatment-related toxicities in colorectal cancer: A prospective pilot study
Presenter: Hong Jun Kim
Session: Poster Display session 2
Resources:
Abstract
2735 - Bevacizumab plus Oxaliplatin-Based Chemotherapy as Adjuvant Treatment for Colon Cancer (CC): Updated analysis of stage II disease from the AVANT Phase III Randomized trial by the GERCOR Group
Presenter: Aimery De Gramont
Session: Poster Display session 2
Resources:
Abstract
1843 - Multicenter Validation of the Postoperative Carcinoembryonic Antigen Combined Prognostic Model for Stage Ⅲ Colon Cancer
Presenter: Ji Zhu
Session: Poster Display session 2
Resources:
Abstract
2554 - Impact of the IDEA study on clinical practice for stage III colon cancer patients: a French GERCOR - FFCD - GI UNICANCER national survey.
Presenter: Kaissa Ouali
Session: Poster Display session 2
Resources:
Abstract
3285 - Sex hormones and sperm parameters after adjuvant oxaliplatin-based treatment for colorectal cancer
Presenter: Philip Falk
Session: Poster Display session 2
Resources:
Abstract
3905 - Loss of CDX-2 expression is an independent poor prognostic biomarker in colorectal cancer
Presenter: Krittiya Korphaisarn
Session: Poster Display session 2
Resources:
Abstract