RESEARCH TRIANGLE PARK, NCThe National Toxicology Program
(NTP) plans to review the three wavelength groups of ultraviolet
lightUVA, UVB, and UVCfor possible listing in the federal
governments Tenth Annual Report on Carcinogens. The three
wavelengths occur in varying amounts in sunlight and in some forms of
artificial light, such as that used in sun lamps and tanning beds.
Multilayered reviews are done to determine if a suspected carcinogen
should be designated as a known human carcinogen or as reasonably
anticipated to be a human carcinogen. The first review is done by
scientists at the National Institute of Environmental Health Sciences
and a second by scientists from a number of federal agencies.
Finally, a panel of outside experts examines the data in a public hearing.
Among other substances being considered for listing:
The fire retardants 2,2-bis-bromo-methylpropanediol and 2,3-dibromo-1-propanol.
Vinyl bromide, which is used in making flame-retardant synthetic fibers.
Vinyl fluoride, used in producing plastics.
Two classes of dyesthe dimeth-oxybenzidines and
dimethylbenzidinesused in textiles, leather, plastics, paper,
Styrene-7,8-oxide, used in preparing fragrances and in some
IQ, a compound found in cooked meat and fish.
In addition, beryllium and beryllium compounds, currently on the
reasonably anticipated list, will be reviewed for possible upgrading
to known human carcinogens.