RPRX Rat carc study- from the 10K
Page 3 para 6 : Proellex is a new chemical entity, which means that the compound will be required to undergo the full regulatory approval process. Among other requirements, this includes a two-year carcinogenicity study, which we began in mid-2006. We have also completed a nine-month primate study to evaluate the effects of Proellex on the endometrium. This study showed no significant toxicity at any dose, with the highest dose comparable to the highest dose in our human clinical trials.
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Androxal is being considered as a new chemical entity by the FDA which means that the compound will be required to undergo the full regulatory approval process. Among other requirements, this includes a two-year carcinogenicity study, which we began in September 2006. Although Androxal is considered a new chemical entity for purposes of requirements for approval, it is closely related chemically to the drug, Clomid, which is approved for use in women to treat certain infertility disorders.
Hope that helps