Abstract:
:Medroxyprogesterone acetate (MPA) is well recognized to have beneficial effects for the treatment of advanced breast cancer which are comparable to those achieved with other forms of endocrine therapy. Using mammary tumors induced in the rat by dimethylbenz(a)anthracene (DMBA) as a model, we have studied the possibility that low dose MPA could prevent the development of these tumors. Single subcutaneous injection of Depo-Provera (crystalline suspension of MPA) or MPA encapsulated in biodegradable microspheres of 50:50 poly[DL-lactide-co-glycolide] was given 7 days before oral DMBA. While 63% of intact animals developed palpable mammary tumors within 85 days after DMBA administration, tumor incidence decreased to 28% and 23% in animals who had received 30 mg and 100 mg of Depo-Provera, respectively. The same amounts of MPA delivered in microspheres caused a further decrease in tumor incidence to respective values of 7% and 6%. Average tumor area, on the other hand, decreased from 4.89 cm2 in intact rats to about 0.75 (0.57-0.88) cm2 and approximately 0.20 (0.14-0.22) cm2 in the Depo-Provera and microsphere-treated groups, respectively. Using the 50:50 formulation of poly[DL-lactide-co-glycolide] designed to release MPA at a constant rate for a 4-month period, the serum MPA concentration at 3 months was measured at 4.99 +/- 0.43 ng/ml. Such data suggest that administration of a low dose controlled-release formulation of MPA in 50:50 poly[DL-lactide-co-glycolide] microspheres could well be an efficient and well tolerated approach for the prevention of breast cancer in women.
journal_name
Breast Cancer Res Treatjournal_title
Breast cancer research and treatmentauthors
Labrie F,Li S,Bélanger A,Côté J,Mérand Y,Lepage Mdoi
10.1007/BF00665803subject
Has Abstractpub_date
1993-01-01 00:00:00pages
253-65issue
3eissn
0167-6806issn
1573-7217journal_volume
26pub_type
杂志文章abstract::The purpose of this study was to better understand older women's experience with breast cancer treatment decisions. We conducted a longitudinal study of non-demented, English-speaking women ≥ 65 years recruited from three Boston-based breast imaging centers. We interviewed women at the time of breast biopsy (before th...
journal_title:Breast cancer research and treatment
pub_type: 杂志文章
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更新日期:2014-05-01 00:00:00
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journal_title:Breast cancer research and treatment
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journal_title:Breast cancer research and treatment
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journal_title:Breast cancer research and treatment
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journal_title:Breast cancer research and treatment
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journal_title:Breast cancer research and treatment
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journal_title:Breast cancer research and treatment
pub_type: 杂志文章
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journal_title:Breast cancer research and treatment
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journal_title:Breast cancer research and treatment
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journal_title:Breast cancer research and treatment
pub_type: 杂志文章
doi:10.1023/B:BREA.0000014037.48744.fa
更新日期:2004-02-01 00:00:00
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journal_title:Breast cancer research and treatment
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更新日期:2000-09-01 00:00:00
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journal_title:Breast cancer research and treatment
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更新日期:2011-10-01 00:00:00
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journal_title:Breast cancer research and treatment
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journal_title:Breast cancer research and treatment
pub_type: 杂志文章
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更新日期:2018-05-01 00:00:00
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journal_title:Breast cancer research and treatment
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更新日期:1997-01-01 00:00:00
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journal_title:Breast cancer research and treatment
pub_type: 杂志文章,评审
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journal_title:Breast cancer research and treatment
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pub_type: 杂志文章
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更新日期:2020-11-18 00:00:00