Background
Alcohol consumption is a recognised risk factor for a number of cancers, but the evidence for any association with prostate cancer risk is mixed.
Where some studies have found no association with alcohol intake and prostate cancer risk, others have, with some evidence pointing towards a dose-dependent effect of alcohol on the aggressiveness of the disease, and the cumulative ‘life-time’ alcohol intake being more important than current intake at the time of diagnosis.
Researchers investigated the hypothesis that high alcohol exposure to a developing prostate early in life could modulate the risk of prostate cancer later in life.
Aim
To test retrospectively the association between early life alcohol consumption and prostate cancer diagnosis, and determine if this is associated with tumour aggressiveness at diagnosis.
Methods
Men attending the Durham Veterans Affairs Medical Centre, North Carolina, US for a prostate biopsy due to raised PSA or an abnormal digital rectal examination were recruited to the study between January 2007 and January 2018.
A total of 650 men were eligible for the study, were aged between 49 and 89 years, and completed a survey to collect demographic data and to assess alcohol intake during each decade of their life, as well as their current alcohol consumption.
Men were asked to indicate the number of alcoholic drinks consumed per week during each period.
Data were categorised into 0, 1-6, or >7 drinks/week. Cumulative lifetime alcohol intake was calculated by summing the number of drinks each week over each decade and categorising this into tertiles (1, <3,094 drinks; 2, 3,094-10,659 drinks; 3, ≥10,659 drinks).
Prostate cancer diagnoses were defined as low grade (Grade Group 1-2; Gleason score ≤3+4) or high grade (Grade Group 3-5; Gleason score ≥4+3).
Results
Of the 650 men, 325 were diagnosed with prostate cancer; 238 men with low grade and 88 men with high grade prostate cancer.
After adjusting for age and demographic characteristics there were no significant associations with alcohol intake and overall risk of a prostate cancer diagnosis.
Furthermore, no association was found between alcohol intake at any age and the risk of low grade prostate cancer.
During ages 15-19, 49% men reported not drinking, 43% reported consuming 1-6 drinks/week and 8% reported having over 7 drinks/week.
Apart from cigarette smoking, which was significantly higher in the same men reporting the highest intake of alcohol intake per week, other demographics were comparable across the age group.
In this group of young men, consuming ≥7 drinks/week was significantly associated with a diagnosis of high grade prostate cancer (odds ratio 3.21; 95% CI, 1.22-8.41).
Similar associations were present over each decade of life including 20-29, 30-39 and 40-49 years.
Likewise cumulative alcohol intake in the upper tertile was significantly associated with a high grade prostate cancer diagnosis compared to the lowest tertile (odds ratio 3.20; 95% CI, 1.47-6.98).
Current alcohol consumption was not significantly linked to a prostate cancer diagnosis. No differences in the results were identified between white (n=304; 47%) and non-white (n=346; 53%) men.
Conclusion
Men with a history of high alcohol intake have an increased risk of being diagnosed with a high grade prostate cancer at biopsy. This association is found for early life exposure to alcohol but not for current alcohol consumption at the time of biopsy.
