Hematological and biochemical action of tiazofurin (NSC 286193) in a case of refractory acute myeloid leukemia.

Abstract:

:A patient with refractory acute myeloid leukemia was treated with tiazofurin, an agent that causes inhibition of tumor cell proliferation by depressing GTP concentrations in the malignant cells. The initial dose of 1100 mg/m2 was ineffective clinically and biochemically. Dose escalations to 1650, 2200, and finally 3300 mg/m2 resulted in a marked decrease in the absolute number of blasts without causing bone marrow hypoplasia or marked neutropenia. The decrease in the peripheral blast cell count was observed subsequent to a decline in GTP concentrations in the leukemic cells to less than 30% of the pretreatment value. Consecutive bone marrow examinations showed a remarkable shift from myeloblasts to more mature myeloid elements, suggesting an in vivo differentiative action of tiazofurin. Although a total dose of 23,650 mg/m2 was administered over a 13-day period, only very mild side effects were noted. The absence of complications reported by others in Phase I trials with tiazofurin may be related to our slow administration of the drug by pump over a 1-h period in this trial. Tiazofurin appears to be a promising agent in the treatment of leukemia because of its selective action on leukemic cells and the availability of a rapid in vitro method capable of predicting sensitivity of leukemic cells to the agent and monitoring its activity during treatment by measuring thiazole-4-carboxamide adenine dinucleotide and GTP concentrations. These observations are being tested in a larger group of leukemic patients.

journal_name

Cancer Res

journal_title

Cancer research

authors

Tricot GJ,Jayaram HN,Nichols CR,Pennington K,Lapis E,Weber G,Hoffman R

subject

Has Abstract

pub_date

1987-09-15 00:00:00

pages

4988-91

issue

18

eissn

0008-5472

issn

1538-7445

journal_volume

47

pub_type

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