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(A) Rabbit mammary tumors showed mostly mild (45%) and moderate (43%) invasive behavior; only small percentages of tumors displayed minimal (4%) and marked (8%) tissue invasion. (B) Necrosis was absent in 22% of the tumors, whereas minimal and mild necrosis was detected in 44% and 22% of rabbit mammary carcinomas, respectively. Moderate necrosis was present in 10% of the tumors and 2% of tumors had marked necrosis.
