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IARC MONOGRAPHS ON THE EVALUATION OF CARCINOGENIC ...

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Table 10 (contd)<br />

Test system<br />

Micronucleus formation, male ICR Swiss mouse bone marrow<br />

erythrocytes in vivo<br />

Result a<br />

Without<br />

exogenous<br />

metabolic<br />

system<br />

With<br />

exogenous<br />

metabolic<br />

system<br />

Dose b<br />

(LED or HID)<br />

Reference<br />

– 500 po × 1 Harper et al. (1984)<br />

1,2-Naphthoquinone<br />

Sister chromatid exchange, human lymphocytes in vitro<br />

1,4-Naphthoquinone<br />

+ NT 1.6 Wilson et al. (1996)<br />

Sister chromatid exchange, human lymphocytes in vitro<br />

Naphthalene 1,2-oxide<br />

+ NT 1.6 Wilson et al. (1996)<br />

Sister chromatid exchange, human lymphocytes in vitro – NT 15 Wilson et al. (1996)<br />

a<br />

+, positive; (+), weak positive; –, negative; NT, not tested; NR, not reported<br />

b<br />

LED, lowest effective dose; HID, highest ineffective dose; in-vitro tests, μg/mL; in-vivo tests, mg/kg bw/day; po, oral; ip, intraperitoneal<br />

c<br />

Toxicity in the absence of metabolic activation<br />

d<br />

Toxicity at next higher dose<br />

e<br />

Rats sacrificed on days 15, 30, 45, 60, 75, 90, 105 and 120; increased DNA fragmentation starting day 30 through day 120<br />

f<br />

LED for liver, based on an oral LD50 = 2200 mg/kg; LED for brain is 1100 mg/kg bw.<br />

414<br />

<strong>IARC</strong> <strong>M<strong>ON</strong>OGRAPHS</strong> VOLUME 82

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