Vanadium pentoxide: use of relevant historical control data shows no evidence for a carcinogenic response in F344/N rats.

Autor: Starr TB; TBS Associates, 7500 Rainwater Road, Raleigh, NC 27615, USA. tbstarr@mindspring.com, Macgregor JA, Ehman KD, Nikiforov AI
Jazyk: angličtina
Zdroj: Regulatory toxicology and pharmacology : RTP [Regul Toxicol Pharmacol] 2012 Oct; Vol. 64 (1), pp. 155-60. Date of Electronic Publication: 2012 Jun 28.
DOI: 10.1016/j.yrtph.2012.06.017
Abstrakt: The National Toxicology Program (NTP) chronic inhalation bioassay of vanadium pentoxide (V(2)O(5)) produced "clear" evidence of lung tumors in B6C3F1 mice, but only "some" and "equivocal" evidence in male and female F344/N rats, respectively. No significant pairwise differences or trends with V(2)O(5) concentration in male or female rat poly-3-adjusted tumor incidence were reported. The "some" and "equivocal" evidence descriptors arose from comparisons of V(2)O(5)-exposed group incidence rates with NTP-2000- and NIH-07-fed historical control (HC) group incidence ranges. NTP acknowledged that use of data from NIH-07-fed HC groups could be inappropriate because the V(2)O(5) study used the NTP-2000 diet, but few studies using this newer diet were available then. We supplemented the early NTP-2000 diet HC data with data from 25 additional NTP-2000 diet studies conducted subsequent to the V(2)O(5) bioassay. This widened the HC tumor incidence ranges, thereby weakening the limited evidence for the carcinogenicity of inhaled V(2)O(5) in rats relative to HCs. The male rat control group in the V(2)O(5) study also appeared to be a near-"outlier" relative to the expanded HC database, potentially invalidating any comparisons of exposed group incidence rates with those for HCs. We conclude that there is "no" evidence of V(2)O(5) carcinogenicity in male or female F344/N rats.
(Copyright © 2012 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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