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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Pediatr+Blood+Cancer
2017 ; 64
(3
): ä Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Initial testing (stage 1) of tazemetostat (EPZ-6438), a novel EZH2 inhibitor, by
the Pediatric Preclinical Testing Program
#MMPMID27555605
Kurmasheva RT
; Sammons M
; Favours E
; Wu J
; Kurmashev D
; Cosmopoulos K
; Keilhack H
; Klaus CR
; Houghton PJ
; Smith MA
Pediatr Blood Cancer
2017[Mar]; 64
(3
): ä PMID27555605
show ga
BACKGROUND: Tazemetostat (EPZ-6438) is a selective inhibitor of the histone
methyltransferase EZH2 and currently in clinical development for non-Hodgkin
lymphoma and genetically defined tumors. PROCEDURES: Tazemetostat was tested
against the Pediatric Preclinical Testing Program (PPTP) solid tumor xenografts
using a dose of 400 mg/kg administered twice daily by oral gavage for 28 days.
H3K27me3:H3 ratios were determined in control and treated tumors. RESULTS:
Tazemetostat induced significant differences in event-free survival (EFS)
distribution compared with control in nine of 30 (30%) of the xenografts studied.
Significant differences in EFS distribution were observed in five of seven (71%)
rhabdoid tumor xenograft lines compared with four of 23 (17%) nonrhabdoid
xenograft lines (chi-square [?(2) ] test P = 0.006). Tazemetostat induced tumor
growth inhibition meeting criteria for intermediate and high EFS
treated-to-control (T/C) activity in two of 25 (8%) and one of 25 (4%)
xenografts, respectively. Intermediate and high activity for the EFS T/C metric
was observed exclusively among rhabdoid tumor xenografts (three of five rhabdoid
tumor vs 0 of 22 nonrhabdoid tumors (?˛ test P < 0.001). One rhabdoid tumor
xenograft (G401) showed stable disease. For one rhabdoid tumor (G401), delayed
tumor regression to tazemetostat was noted following 1 week of tumor growth.
Tazemetostat induced significant reduction of H3K27me3 levels in the majority of
tumors compared with controls. CONCLUSIONS: Tazemetostat demonstrated significant
antitumor activity in rhabdoid tumor models but showed no consistent activity
against any other histology. Tazemetostat reduced H3K27me3 levels irrespective of
tumor response. Further preclinical testing to evaluate tazemetostat in
combination with other anticancer agents is warranted.
|Animals
[MESH]
|Antineoplastic Agents/*pharmacology
[MESH]
|Benzamides/*pharmacology
[MESH]
|Biphenyl Compounds
[MESH]
|Cell Proliferation/drug effects
[MESH]
|Drug Evaluation, Preclinical
[MESH]
|Enhancer of Zeste Homolog 2 Protein/*antagonists & inhibitors
[MESH]