GxE Interaction Analysis Conducted to Suss Out Link Between Red Meat and CRC Risk

In a large study on gene-environment interactions, researchers identified two genetic markers, HAS2 and SMAD7, that shed light on the connection between red meat consumption and colorectal cancer risk. The study, supported by the NIH and led by USC Norris Comprehensive Cancer Center, analyzed data from nearly 70,000 individuals to reveal a 30-40% increased risk of colorectal cancer associated with higher red or processed meat intake.

The research pinpointed specific genetic variants that influence cancer risk based on meat consumption levels. The HAS2 gene variant was linked to a 38% higher risk in individuals consuming high levels of red meat, while the SMAD7 gene variant showed varying risks depending on genetic makeup and meat intake. The findings, published in Cancer Epidemiology, Biomarkers & Prevention, suggest that certain genetic variations may predispose individuals to a higher risk of colorectal cancer when consuming red or processed meat.

“These findings suggest that there's a subset of the population that faces an even higher risk of colorectal cancer if they eat red or processed meat,” said lead author Mariana C. Stern.  “It also allows us to get a peek at the potential mechanism behind that risk, which we can then follow up with experimental studies.”

The study's innovative statistical methods allowed for the identification of these genetic interactions among millions of gene variants. While these results provide valuable insights into the mechanisms underlying colorectal cancer development, further experimental studies are needed to establish a causal relationship between these genetic markers and cancer risk.

“This gives us some important food for thought,” Stern added. “We do these gene-environment interaction studies when we know there’s a clear association between an environmental exposure and a disease, but what happens in between is still a black box.”