Biochem Pharmacol. 1992 Dec 15;44(12):2273-80.

EB1089: a new vitamin D analogue that inhibits the growth of breast cancer cells in vivo and in vitro.

Colston KW, Mackay AG, James SY, Binderup L, Chander S, Coombes RC.

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Department of Clinical Biochemistry, St Georges Hospital Medical School, Tooting, London, U.K.

Abstract

EB1089 is a novel vitamin D analogue which has been tested for its effects on breast cancer cell growth in vitro, using the established human breast cancer cell line MCF-7, and in vivo on the growth of established rat mammary tumours. Both EB1089 and 1,25-dihydroxyvitamin D3 (1,25-(OH)2D3) inhibited MCF-7 cell proliferation with the synthetic analogue being at least an order of magnitude more potent than the native hormone. In vivo anti-tumour effects were investigated using the N-methyl-nitrosourea-induced rat mammary tumour model. Oral treatment with EB1089 was tested at three doses. With the lower dose, significant inhibition of tumour growth was seen in the absence of a rise in serum calcium. The same dose of 1,25-(OH)2D3 had no effect on tumour growth but caused hypercalcaemia. With the higher dose of EB1089, striking tumour regression was seen although serum calcium rose. This report demonstrates that EB1089 possess enhanced anti-tumour activity coupled with reduced calcaemic effects relative to 1,25-(OH)2D3 and thus may have therapeutic potential as an anti-tumour agent.

PMID:: 1472092; [PubMed - indexed for MEDLINE]

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