Ohio: Obesity is a known risk factor for breast and other cancers, but knowledge about the underlying biology of how, when and by what mechanism obesity influences cancer risk is limited. New research from The Ohio State University Comprehensive Cancer Center – Arthur G. James Cancer Hospital and Richard J. Solove Research Institute (OSUCCC – James) offers some of the first evidence that obesity alters in genes involved in inflammatory response (32 genes), hereditary disorders (48 genes) and other immunological diseases (42 genes).
Researchers will present their findings Tuesday, April 4, at the American Association for Cancer Research (AACR) 2017 Annual Meeting in Washington, D.C.
A multidisciplinary team made of geneticists, cell biologists,
medical oncologists and epidemiologists conducted a broad spectrum gene
expression analysis of tissue samples from 121 healthy women with no
history of breast cancer. All women were undergoing breast reduction surgery and 51 patients were clinically obese.
The team integrated DNA methylation and mRNA expression into the
analysis to identify 308 genes important in the obesity/inflammation
relationship. Of these, 240 were shown to have high DNA methylation
(more likely to have sporadic mutations), low gene expression in obese
women and 68 gene has low DNA methylation, high gene expression status.
All of the affected genes were involved in diseases and disorders for
inflammatory response, hereditary disorder and immunological disease.
“Different types of breast cancer could be affected differently by
obesity, A more robust understanding of how obesity triggers
inflammatory cancer pathways and increases breast cancer risk could help
us develop better chemoprevention strategies or early prevention
strategies in women at increased risk based on their weight,” says Peter Shields, MD, senior author of the AACR abstract and deputy director of the OSUCCC – James.
Future studies would be designed to understand the specific genes
identified in this study among women who ultimately develop breast
Collaborators in the study include first author Daniel Weng, PhD, Min-Ae Song, PhD, Theodore Brasky, PhD,
Catalin Marian, Renny Lan of the OSUCCC-James; Adana Llanos, PhD, MPH,
of Rutgers Cancer Institute, Scott Spear, MD, and Bhaskar Kallakury, MD,
of Georgetown University; Jo Freudenheim, PhD, of the University of