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- W2014930947 abstract "To study the effectiveness of the vitamin D analogue 1alpha-hydroxyvitamin D(2) (1alpha-OH-D(2)) in inhibiting ocular tumor growth in transgenic Tyr-Tag mice that developed pigmented ocular tumors produced with the simian virus 40 T and t antigens under the control of the mouse tyrosinase gene. These animals develop pigmented intraocular tumors primarily from the retinal pigment epithelium that closely resemble the histologic features and growth pattern of human choroidal melanoma.A total of 73 Tyr-Tag transgenic mice between 6 and 7 weeks old were randomly assigned by sex and litter to 3 treatment groups to receive 0.05 microg/d, 0.1 microg/d, or 0.2 microg/d of 1alpha-OH-D(2); a control group received vehicle (coconut oil). The drug was administered by oral gavage 5 times a week for 5 weeks. The animals were then euthanized and their eyes were enucleated and processed histologically. Three serial sections from each eye were examined microscopically and the mean tumor area measured using Optimus software version 6.5 (Media Cybernetics LP, Silver Spring, Md). Toxic adverse effects were assessed on the basis of mortality, weight loss, and serum calcium levels.The mean tumor size in the 0.1- microg/d and 0.2- microg/d dose groups was smaller than in the controls (P<.001). No significant difference was seen between the 0.05- microg/d dose group and the control group (P =.64). Survival for the 0.1- microg/d and 0.2- microg/d dose groups was lower than for the controls (95% in the controls vs 85.7% and 73.7%, respectively; P<.01).In the Tyr-Tag transgenic mouse, 1alpha-OH-D(2) inhibits pigmented ocular tumor growth at moderate drug levels with relatively low mortality. Clinical Relevance Vitamin D analogues merit further preclinical study in the treatment of ocular melanoma." @default.
- W2014930947 created "2016-06-24" @default.
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- W2014930947 date "2004-09-01" @default.
- W2014930947 modified "2023-10-12" @default.
- W2014930947 title "Effectiveness of 1α-Hydroxyvitamin D2 in InhibitingTumor Growth in a Murine Transgenic Pigmented Ocular Tumor Model" @default.
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- W2014930947 doi "https://doi.org/10.1001/archopht.122.9.1365" @default.
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