Until now, existing data on the oral carcinogenicity of
nickel substances have been inconclusive. Yet, the assessment of oral carcinogenicity of
nickel has serious scientific and regulatory implications. In the present study,
nickel sulfate hexahydrate was administered daily to Fischer 344 rats by oral gavage for 2 years (104 weeks) at exposure levels of 10, 30 and 50 mg NiSO(4).6H(2)O/kg. This treatment produced a statistically significant reduction in
body weight of male and female rats, compared to controls, in an exposure-related fashion at 30 and 50 mg/kg/day. An exposure-dependent increase in mortality was observed in female rats. However, the overall study survival rate (males and females) was at least 25 animals per group (compliant with OECD guidelines) in the treated animals. Daily
oral administration of
nickel sulfate hexahydrate did not produce an exposure-related increase in any common
tumor type or an increase in any rare
tumors. One
tumor type was statistically increased in a
nickel sulfate-treated group compared to the study controls (
keratoacanthoma in the 10 mg NiSO(4).6H(2)O/kg/day males), but there was no exposure-response relationship for this common
tumor type. This study achieved sufficient toxicity to reach the Maximum Tolerated Dose (MTD) while maintaining a sufficiently high survival rate to allow evaluation for carcinogenicity. The present study indicated that
nickel sulfate hexahydrate does not have the potential to cause carcinogenicity by the oral route of exposure in the Fischer 344 rat. Data from this and other studies demonstrate that inhalation is the only route of exposure that might cause concern for
cancer in association with
nickel exposures.