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Anaplastic thyroid carcinoma is a rapidly fatal neoplasm that fails to adequately respond to any known chemotherapeutic regimen. We tested taxol (paclitaxel) against six human anaplastic thyroid carcinoma cell lines (DRO-90, ARO-81, KAT-4, KAT-18, SW-1736, and BHT-101). Each cell line monolayer culture, in log phase growth, was treated with taxol concentrations ranging from 0.001-5.0 mumol/L. Cell numbers, after 24-, 48-, and 72-h growth periods in separate experiments, were expressed as percentages of control cell numbers without taxol. All cell lines showed maximal inhibition with 0.05 mumol/L taxol at 3-28% of control cell numbers. Greater inhibition was seen with longer growth periods. Three cell lines (DRO-90, ARO-81, and KAT-4) were grown as sc xenograft tumors in nude mice for 18-26 days. Treatment groups received sc taxol injections in sites distant from the tumors, whereas control mice received vehicle. All taxol-treated xenografts were inhibited to near-starting volume or disappeared, whereas control xenograft volumes increased 9- to 59-fold. These results suggest that taxol may have beneficial clinical effects in anaplastic thyroid carcinoma patients.

Antineoplastic activity of taxol against human anaplastic thyroid carcinoma cell lines in vitro and in vivo.