4 demethyl epipodophyllotoxin/白血病

Epipodophyllotoxin VP 16213 (4-demethyl-epipodophyllotoxin-beta-D-ethylidene glucoside), given to 250 patients with various types of malignant disease, induced apparently complete remissions in four out of eight cases of acute monocytoid and acute myelomonocytoid leukaemia but only one complete

GP7 (4-[4"-(2",2",6",6"-tetramethyl-l"-piperidinyloxy)amino]-4'-demethyl epipodophyllotoxin), a new spin-labeled derivative of podophyllotoxin, is a promising anticancer drug of podophyllotoxin class. The primary effect of GP7 is the anticancer activity on transplanted mouse tumors and cultured

GP7 (4-[4"-(2", 2", 6", 6"-tetramethyl-l"-piperidinyloxy) amino]-4'-demethyl epipodophyllotoxin) is a promising anticancer drug of the podophyllotoxin class. However, little is known about its anti-multidrug resistance effects. In the present study, we investigated the effects of GP7 on

A clinical trial of the oral form of VP 16-213 (NSC-141540), a semisynthetic podophyllotoxin, was undertaken. In 20 patients, treatment was started at 200 mg/day p.o. for 5 days; courses were repeated after a rest period of 16 days. Five patients were treated at the same dose, repeated with only

This paper describes the synthesis and antitumor activity of 4-acylthiol-4-deoxy-4'-demethylepipodophyllotoxin analogues. 4-Mercapto-4-deoxy-4'-demethylepipodophyllotoxin prepared from 4'-demethylepipodophyllo-toxin with H2S in the presence of BF3.Et2O, was acylated with different acids using

DNA fragmentation into internucleosomal fragments is the best recognized biochemical event of apoptosis. Two major caspase pathways have been identified in the signal transduction leading to DNA fragmentation: the receptor pathway and the mitochondrial pathway. DNA fragmentation factor (DFF) has

BACKGROUND Tumor cell resistance to anticancer drugs is the primary reason for treatment failure in childhood cancer. Resistance can exist at the onset of treatment or can become clinically apparent under selective pressure of drug exposure. In vitro predictive tests are important for the

The antitumor activities of several glucuronide methyl esters of podophyllum derivatives were tested in vitro against two human tumor cell lines and their drug resistant sublines. The most active compound studied was methyl (4'-carbobenzoxy-4'-demethyl-epipodophyllotoxin-D-glucopyranoside)uronat e

Since 1970, we have carried out cancer chemotherapy and immunotherapy in cooperation with Japanese scientists, particularly Prof. H. Umezawa, who has generously supplied bleomycin, peplomycin, acalcinomycin A (ACM), THP-adriamycin (THP), neothramycin and bestatin. Malignant tumors curable by

Four new nitroxyl labeled derivatives of podophyllotoxin, 4-(2, 2, 6, 6-tetramethyl-1-oxyl-4-piperidyl)oxy-epipodophyllotoxin (4), 4-(2, 2, 6, 6-tetramethyl-1-oxyl-4-piperidyl)oxy-4'-demethylepipodophyllotoxin (5), 4-(2, 2, 5, 5-tetramethyl-1-oxyl-3-pyrrolinyl)formyloxy-epipodophyllotox in (6) and

Previous study has found that a new nitroxyl spin-labeled derivative of podophyllotoxin, 4-[4"-(2",2",6",6"-tetramethyl-1"-piperidinyloxy)amino]-4'-demethyl-epipodophyllotoxin (GP7), can induce apoptosis in human leukemia cells. However, there have been no studies about the effects of GP7 on