A significant correlation of homogeneous MGMT-immunoreactivity (>95% MGMT positive tumor cells) and an unmethylated MGMT promoter was found.
The NOA-08 authors also analyzed overall survival and event-free survival according to MGMT status and treatment arm.
MGMT promoter methylation appeared as an intermediate event, which is in line with earlier studies showing MGMT promoter methylation in 26% of invasive cancers and 29% of high-grade CIN lesions, compared with only 3% of low-grade CIN lesions (Virmani et al, 2001).
Mcl-1 and MGMT status may effect treatment outcome.
The stochastic nature of this hypermethylation event is of particular interest, since variation in MGMT CpG island hypermethylation in gliomas is associated with clinical response to alkylating agents [24].
MGMT methylation was significantly more frequent event in patient group who survived longer than 36 months after operation (p < 0.05), while methylation of CASP8 was more frequent in patients who survived shorter than 36 months (p < 0.05).
You've even got MGMT designing an issue of Playboy".
Patients with a methylated MGMT promoter had more severe adverse events, requiring more TMZ dose reductions or discontinuations (P=0.007; OR 2.7 (95% CI: 1.32 5.7)).
MGMT hypermethylation in CpG islands and low MGMT protein expression appear to be early events in CRC patients.
In oral carcinomas, methylation of the p16 and MGMT genes are frequently observed as an early event (Kato et al. 2006).
