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Prostate‐specific antigen levels in relation to cadmium exposure and zinc intake: results from the 2001–2002 national health and nutrition examination survey
Author(s) -
van Wijngaarden Edwin,
Singer Eric A.,
Palapattu Ganesh S.
Publication year - 2007
Publication title -
the prostate
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.295
H-Index - 123
eISSN - 1097-0045
pISSN - 0270-4137
DOI - 10.1002/pros.20668
Subject(s) - national health and nutrition examination survey , cadmium , medicine , prostate cancer , physiology , prostate specific antigen , zinc , population , prostate , endocrinology , cancer , environmental health , chemistry , organic chemistry
BACKGROUND Cadmium exposure has been suggested as a risk factor for prostate cancer, and experimental literature suggests that the carcinogenic effect of cadmium is modified by the presence of zinc. We evaluated total prostate‐specific antigen (PSA) levels in relation to urinary cadmium concentrations and dietary zinc intake. METHODS PSA levels were determined in 1,320 men over the age of 40 in the 2001–2002 National Health and Nutrition Examination Survey (NHANES). Urinary cadmium concentrations were measured in about one‐third of the sample population, whereas dietary zinc intake was based on participants' 24‐hr recall. Information on all three variables was available for 422 men in the 2001–2002 NHANES survey. We performed linear regressions to evaluate the relationships these factors after accounting for age and other covariates. RESULTS Little evidence for an association between cadmium and elevated PSA level was observed. However, the data provide suggestive evidence for an interaction between zinc intake and cadmium exposure ( P for interaction = 0.09). Among men with zinc intake less than the median level of 12.67 mg/day, an increase in 1 µg/g creatinine cadmium exposure was associated with a 35% increase in PSA level. In contrast, among men with greater than median zinc intake, little evidence for an association between cadmium and PSA was found. CONCLUSIONS These findings suggest a protective effect of zinc intake on cadmium‐induced prostatic injury, and may provide further rationale for investigating the impact of these factors individually and jointly on the etiology of prostate cancer. Prostate 68: 122–128, 2008. © 2007 Wiley‐Liss, Inc.