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No carcinogenicity study results are available. Nevertheless from the data available on the reaction mass of cerium dioxide and lanthanum oxide and lanthanum fluoride, as well as on the related mono-constituents cerium dioxide or lanthanum oxide, testing for carcinogenicity is not required as all these subtsances are not mutagenic and as no evidence of pre-neoplastic lesions was observed in the repeated dose toxicity study using cerium dioxide.

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