December 14, 2010
COLON AND RECTAL CANCER AND ALCOHOL CONSUMPTION
My maternal grandfather died of colon cancer. So did my maternal uncle. Neither was particularly regular at seeing a doctor and both were diagnosed when the disease was widespread and untreatable.
Both were alcoholics.
Colorectal cancer can run in families. There is a genetic predisposition.
Strike one.
Alcohol has been associated with increased colorectal cancer.
Strike two.
Since December is Colorectal Cancer Education and Awareness Month and since colorectal cancer is something that is potentially a really personal problem for me, I thought it would be appropriate to discuss the evidence for the link between Colorectal cancer and alcohol.
First and foremost, alcohol has been shown to increase the risk for cancers of the entire alimentary system: mouth, throat, esophagus, stomach, colon, and rectum. When alcohol is metabolically degraded, the first breakdown product is acetaldehyde. Although alcohol itself has not been shown to cause cell mutations leading to cancer, acetaldehyde is a notorious carcinogen. Bacteria throughout the gut can create acetaldehyde from alcohol and so it is no wonder that cancers are increased there.
This relationship is not theoretical; it is proven. There is a tumor-suppressing gene known as p53. One of the more common alterations in colorectal cancer cells is a mutation in p53 which renders it less effective in preventing tumors Alcohol, especially in the form of beer, has been shown to increase mutations in p53.
A recent study showed a 21% increase in colorectal cancer in moderate drinkers (12 ounces of alcohol per week) and an 85% increase in a subset of colorectal cancers deemed to be more aggressive.
When I was drinking, I had two strikes against me. Sober, I have greatly reduced my colorectal cancer risk.
Just one more sound reason to re-examine our cozy relationship with alcohol and realize it is not the benign habit that we were led to believe.
References:
Scattery, ML; Dis Colon & Rectum, August 2010
Poynter, JN; Cancer Epidemiol Biomarkers Prevue, August 2010