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59 FR (01/11/1994) » 94-536. National Toxicology Program; Availability of Technical Report on Toxicology and Carcinogenesis Studies of Mercuric Chloride
94-536. National Toxicology Program; Availability of Technical Report on Toxicology and Carcinogenesis Studies of Mercuric Chloride
[Federal Register Volume 59, Number 7 (Tuesday, January 11, 1994)]
[Unknown Section]
[Page 0]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 94-536]
[[Page Unknown]]
[Federal Register: January 11, 1994]
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DEPARTMENT OF HEALTH AND HUMAN SERVICES
National Toxicology Program; Availability of Technical Report on
Toxicology and Carcinogenesis Studies of Mercuric Chloride
The HHS' National Toxicology Program announces the availability of
the NTP Technical Report on the toxicology and carcinogenesis studies
of Mercuric Chloride, an inorganic compound that has been used in
agriculture as a fungicide, in medicine as a topical antiseptic and
disinfectant, and in chemistry as an intermediate in the production of
other mercury compounds.
Two-year toxicology and carcinogenicity studies were conducted by
administering to groups of 60 rats of each sex 0, 2.5, or 5 mg mercuric
chloride/kg body weight and to groups of 60 mice of each sex 0, 5, or
10 mg/kg in deionized water by gavage 5 days per week for 2 years.
Under the conditions of these 2-year gavage studies, there was some
evidence of carcinogenic activity\1\ of mercuric chloride in male F344
rats based on the increased incidence of squamous cell papillomas of
the forestomach. Marginally increased incidences of thyroid follicular
cell adenomas and carcinomas may have been related to mercuric chloride
exposure. There was equivocal evidence of carcinogenic activity of
mercuric chloride in female F344 rats based on two squamous cell
papillomas of the forestomach. There was equivocal evidence of
carcinogenic activity of mercuric chloride in male B6C3F1 mice based on
the occurrences of two renal tubule adenomas and one renal tubule
adenocarcinoma. There was no evidence of carcinogenic activity of
mercuric chloride in female B6C3F1 mice receiving 5 or 10 mg/kg.
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\1\The NTP uses five categories of evidence of carcinogenic
activity observed in each animal study: Two categories for positive
results (``clear evidence'' and ``some evidence''), one category for
uncertain findings (``equivocal evidence''), one category for no
observable effect (``no evidence''), and one category for studies
that cannot be evaluated because of major flaws (``inadequate
study'').
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Questions or comments about the Technical Report should be directed
to Central Data Management at P.O. Box 12233, Research Triangle Park,
NC 27709 or telephone (919) 541-3419.
Copies of Toxicology and Carcinogenesis Studies of Mercuric
Chloride (CAS No. 7487-94-7) in F344/N Rats and B6C3F1 Mice (Gavage
Studies) (TR-408) are available without charge from Central Data
Management, NIEHS, MD A0-01, P.O. Box 12233, Research Triangle Park, NC
27709; telephone (919) 541-3419.
Dated: January 3, 1994.
Kenneth Olden,
Director, National Toxicology Program.
[FR Doc. 94-536 Filed 1-10-94; 8:45 am]
BILLING CODE 4140-01-M
Document Information
- Published:
- 01/11/1994
- Department:
- Health and Human Services Department
- Entry Type:
- Uncategorized Document
- Document Number:
- 94-536
- Pages:
- 0-0 (1 pages)
- Docket Numbers:
- Federal Register: January 11, 1994