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BACKGROUND: Vitamin B(12), holo-haptocorrin, and the folate-pathway single-nucleotide polymorphisms MTR 2756A>G and SHMT1 1420C>T have been associated with an increased risk of prostate cancer. We investigated whether these and other elements of folate metabolism were associated with prostate-specific antigen (PSA) velocity (PSAV) as a proxy measure of prostate cancer progression in men with localized prostate cancer. METHODS: We measured plasma folate, B(12), holo-haptocorrin, holo-transcobalamin, total transcobalamin, and total homocysteine at diagnosis in 424 men (ages 45-70 years) with localized prostate cancer in a U.K.-wide population-based cohort. Thirteen folate-pathway single-nucleotide polymorphisms were genotyped for 311 of these men. Postdiagnosis PSAV (continuous measure and with a threshold set a priori at 2 ng/mL/y) was estimated from repeat PSA measurements. RESULTS: Median follow-up time was 2.5 (range, 0.8-5.6) years. Vitamin B(12), holo-haptocorrin, holo-transcobalamin, total transcobalamin, and total homocysteine were not associated with postdiagnosis PSAV. Folate was associated with an increased risk of PSAV >2 ng/mL/y [odds ratio (OR) per unit increase in log(e) concentration, 1.57; 95% confidence interval (95% CI), 0.98-2.51; P = 0.06]. MTRR 66A>G (rs1801394) was associated with a reduced risk (recessive model OR, 0.33; 95% CI, 0.11-0.97; P = 0.04), and SHMT1 1420C>T (rs1979277) with an increased risk (per-allele OR, 1.49; 95% CI, 0.93-2.37; P = 0.09) of PSAV >2 ng/mL/y. CONCLUSIONS: We found weak evidence that higher folate levels may be associated with faster progression of localized prostate cancer. IMPACT: Long-term follow-up is needed to test associations with metastases and mortality, and the observed genetic effects require replication.

Original publication

DOI

10.1158/1055-9965.EPI-10-0582

Type

Journal article

Journal

Cancer Epidemiol Biomarkers Prev

Publication Date

11/2010

Volume

19

Pages

2833 - 2838

Keywords

Aged, Biomarkers, Tumor, Disease Progression, Folic Acid, Genetic Predisposition to Disease, Genotype, Homocysteine, Humans, Male, Middle Aged, Polymorphism, Single Nucleotide, Prostate-Specific Antigen, Prostatic Neoplasms, Signal Transduction, Vitamin B 12