endocrine/exocrine glands
N |
• in contrast to cultured transgenic mammary epithelial cells which show susceptibility to toxicity by transgene expression, mammary tissue in lactating transgenic females appears normal when examined at day 16 of pregnancy and day 1 of lactation; mice can nurse and support their litters, similar to wild-type mice
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• in addition to tumors, some females maintaine as parous mice (4/40), develop solid lesions before 18 months of age
• tumor-free females (19) exhibit mammary gland abnormalities, with inflammatory nodules with squamous metaplasia and ectatic ducts found in almost all abnormal glands
• atypical hyperplasia and squamous metaplasia are common lesions in mammary glands
• some mammary glands of wild-type controls exhibit abnormal morphology resembling a mid-pregnant female
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• some females maintained as parous mice for 12-24 months (3/40; 1 female had 3 tumors in thoracic mammary glands) develop palpable mammary tumors, identified as typical adenocarcinomas and on scirrhous carcinoma compared to only 1 palpable mammary tumor in wild-type controls at 20 months of age
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neoplasm
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• some females maintained as parous mice for 12-24 months (3/40; 1 female had 3 tumors in thoracic mammary glands) develop palpable mammary tumors, identified as typical adenocarcinomas and on scirrhous carcinoma compared to only 1 palpable mammary tumor in wild-type controls at 20 months of age
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integument
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• in addition to tumors, some females maintaine as parous mice (4/40), develop solid lesions before 18 months of age
• tumor-free females (19) exhibit mammary gland abnormalities, with inflammatory nodules with squamous metaplasia and ectatic ducts found in almost all abnormal glands
• atypical hyperplasia and squamous metaplasia are common lesions in mammary glands
• some mammary glands of wild-type controls exhibit abnormal morphology resembling a mid-pregnant female
|
|
• some females maintained as parous mice for 12-24 months (3/40; 1 female had 3 tumors in thoracic mammary glands) develop palpable mammary tumors, identified as typical adenocarcinomas and on scirrhous carcinoma compared to only 1 palpable mammary tumor in wild-type controls at 20 months of age
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