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Table 3.4. Incidence of duodenal tumours in 4 strains of female mice treated with 0.4% H2O2 in drinking water (Ito et al., 1984)
Strain Number of mice Catalase activity (10-4 k/mg protein) Number of mice with tumours
(% incidence)		 Total number of tumours
C3H/HeN 18 5.3 2 (11.1%) 2
B6C3F1 22 1.7 7   (31.8%) 8
C57BL/6N 21 0.7 21 (100 %) 82
C3H/C 24 0.4 22 (91.7%) 63

Source: SCCP  Opinion on Hydrogen peroxide, in its free form or when released, in oral hygiene products (2007), p.30