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Effect of various doses of estrogen (E), E plus progesterone (P), P alone, or E plus P plus testosterone propionate on mammary carcinogenesis in ovariectomized ACI rats. Tumors appeared only in high E (30 mg → 3 mg) plus 30 mg of P (filled squares) and high E (30 mg → 3 mg) plus 30 mg of P plus 30 mg of TP (filled triangles) groups. All other groups (filled diamonds) had no tumors.
