Abstract：
:Estramustine is an estradiol-based antimicrotubule agent that accumulates in malignant glioma cells, resulting in a concentration-dependent inhibition of proliferation. This agent has been shown to synchronize human glioma cells at G2-M consistent with its known effects on the mitotic spindle and potentially could be used as a radiation enhancer. We determined the effects of estramustine on the cell cycle of glioblastoma cells by flow cytometry. These findings were compared with clonogenic survival in cells pretreated with varying concentrations of estramustine prior to irradiation. These experiments indicated that 24 h treatment with 1 microM estramustine had no effect on the percentage of G2-M cells and did not enhance the cytotoxic effects of radiation while 10 microM estramustine increased the G2-M fraction by 100% associated with a potentiation factor as high as 8.5 and a relative radiation sensitivity at 70% cytotoxicity of 5.2 compared with 15.4 for control cells. Estramustine can be administered p.o. on a daily schedule with minimal systemic toxicity. These data suggest that estramustine may be an effective radiation enhancer for glioblastoma.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Yoshida D,Piepmeier J,Weinstein Msubject
Has Abstractpub_date
1994-03-15 00:00:00pages
1415-7issue
6eissn
0008-5472issn
1538-7445journal_volume
54pub_type
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