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Unexpected Findings on Weight Loss and Breast Cancer from International Study in JNCCN

New research found that weight loss after diagnosis was associated with worse outcomes for HER2-positive early breast cancer patients

NCCN Logo (C)NCCN(R) 2018. All rights reserved.

News provided by

National Comprehensive Cancer Network

Feb 16, 2021, 08:35 ET

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PLYMOUTH MEETING, Pa., Feb. 16, 2021 /PRNewswire/ -- New research in the February 2021 issue of JNCCN—Journal of the National Comprehensive Cancer Network examined body mass index (BMI) data for people with HER2-positive early breast cancer, and found a 5% weight loss in patients over two years in was associated with worse outcomes. Weight gain over the same time period did not affect survival rates.

"The finding that weight loss, and not weight gain, was associated with worse outcomes is unexpected," said lead researcher Samuel Martel, MD, Universitè de Sherbrooke, Quebec, Canada, who worked with researchers in Belgium, Brazil, Germany, Italy, Switzerland, and the United Kingdom, as well as the National Cancer Institute and the Mayo Clinic in the United States. "We were unable to make a distinction between intentional versus unintentional weight loss, so it's a matter of speculation whether worse outcomes were due to weight loss, or vice versa. We hope our findings highlight the importance of incorporating consecutive and prolonged data collection on weight in oncology trials, and gaining greater understanding of the metabolic processes after cancer diagnosis that may impact outcomes."

The BMI data came from the ALTTO BIG 2-06 trial, which collected height and weight data in 8,381 patients with HER2-positive early breast cancer treated with chemotherapy plus trastuzumab and/or lapatinib. 2.2% were underweight at the start of treatment, 45.3% were normal weight, 32.1% were classified as overweight, with another 20.4% obese—defined as a BMI greater than 30. Initial obesity was associated with worse outcomes, including more frequent and serious adverse events leading to treatment discontinuation, as well as significantly worse overall survival rates.

"It was surprising to see that more than 5% weight loss at 2 years was associated with poorer distant disease-free survival. Is our general advice to obese/overweight patient to exercise and lose weight wrong?" questioned Anthony D. Elias, MD, University of Colorado Cancer Center, a member of the NCCN Clinical Practice Guidelines (NCCN Guidelines®) Panel for Breast Cancer. "Careful examination of the Kaplan-Meier hazard plots suggests that the relapse curves for those with weight loss are steeper in the second and third years of follow-up, but thereafter are relatively parallel. It's possible that the weight loss observed early may be an indication for impending relapse of breast cancer."

The study highlights the importance of weight management in cancer survivorship. The authors hope their findings may provide the basis for further research and oncology trials to guide weight control during the survivorship period.

To read the entire study, visit JNCCN.org. Complimentary access to "Body Mass Index and Weight Change in Patients With HER2-Positive Early Breast Cancer: Exploratory Analysis of the ALTTO BIG 2-06 Trial" is available until May 10, 2021.

About JNCCN—Journal of the National Comprehensive Cancer Network
More than 25,000 oncologists and other cancer care professionals across the United States read JNCCN—Journal of the National Comprehensive Cancer Network. This peer-reviewed, indexed medical journal provides the latest information about innovation in translational medicine, and scientific studies related to oncology health services research, including quality care and value, bioethics, comparative and cost effectiveness, public policy, and interventional research on supportive care and survivorship. JNCCN features updates on the NCCN Clinical Practice Guidelines in Oncology (NCCN Guidelines®), review articles elaborating on guidelines recommendations, health services research, and case reports highlighting molecular insights in patient care. JNCCN is published by Harborside. Visit JNCCN.org. To inquire if you are eligible for a FREE subscription to JNCCN, visit http://www.nccn.org/jnccn/subscribe.aspx. Follow JNCCN on Twitter @JNCCN.

About the National Comprehensive Cancer Network
The National Comprehensive Cancer Network® (NCCN®) is a not-for-profit alliance of leading cancer centers devoted to patient care, research, and education. NCCN is dedicated to improving and facilitating quality, effective, efficient, and accessible cancer care so patients can live better lives. The NCCN Clinical Practice Guidelines in Oncology (NCCN Guidelines®) provide transparent, evidence-based, expert consensus recommendations for cancer treatment, prevention, and supportive services; they are the recognized standard for clinical direction and policy in cancer management and the most thorough and frequently-updated clinical practice guidelines available in any area of medicine. The NCCN Guidelines for Patients® provide expert cancer treatment information to inform and empower patients and caregivers, through support from the NCCN Foundation®. NCCN also advances continuing education, global initiatives, policy, and research collaboration and publication in oncology. Visit NCCN.org for more information and follow NCCN on Facebook @NCCNorg, Instagram @NCCNorg, and Twitter @NCCN.

Media Contact:
Rachel Darwin
267-622-6624
[email protected]

SOURCE National Comprehensive Cancer Network

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