Prostate Cancer possibly linked to Zinc intake
In a case-control study conducted in Spain, investigators found that men in the highest tertile of dietary zinc intake (greater than 10.53 mg/day) had a significant 66% increased relative risk of Gleason 6 PCa compared with those in the lowest tertile (less than 8.34 mg/day).
The study found no significant associations between zinc intake and higher-grade or more advanced PCa tumours.
The investigators also looked at genotype information from selected patients with available DNA (514 cases and 81 controls) and found evidence suggesting that the possible deleterious effect of higher zinc intake on PCa risk is greater among men with a stronger genetic predisposition to PCa.
The investigators cited previous research showing that zinc is involved in the process of proliferation and apoptosis cell regulation in the prostate, and zinc concentrations are consistently lower in PCa tissue than in normal cells. Additionally, zinc depletion in PCa tissue has been related to Gleason score and tumour aggressiveness
Gutiérrez-González E, Castelló A, Fernández-Navarro P, et al. Dietary zinc and risk of prostate cancer in Spain: MCC-Spain Study. Nutrients. 2018; published online ahead of print.