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Prognostic Associations of Activated Mitogen-Activated Protein Kinase and Akt Pathways in Glioblastoma
- Source :
- Clinical Cancer Research. 12:3935-3941
- Publication Year :
- 2006
- Publisher :
- American Association for Cancer Research (AACR), 2006.
-
Abstract
- Purpose: Activation of mitogen-activated protein kinase (MAPK) and members of the Akt pathway have been shown to promote cell proliferation, survival, and resistance to radiation. This study was conducted to determine whether any of these markers are associated with survival time and response to radiation in glioblastoma. Experimental Design: The expression of phosphorylated (p-)Akt, mammalian target of rapamycin (p-mTOR), p-p70S6K, and p-MAPK were assessed by immunohistochemical staining in 268 cases of newly diagnosed glioblastoma. YKL-40, a prognostic marker previously examined in these tumors, was also included in the analysis. Expression data were tested for correlations with response to radiation therapy in 131 subtotally resected cases and overall survival (in all cases). Results were validated in an analysis of 60 patients enrolled in clinical trials at a second institution. Results: Elevated p-MAPK expression was most strongly associated with poor response to radiotherapy, a finding corroborated in the validation cohort. For survival, higher expressions of p-mTOR, p-p70S6K, and p-MAPK were associated with worse outcome (all P < 0.03). YKL-40 expression was associated with the expressions of p-MAPK, p-mTOR, and p-p70S6K (all P < 0.02), with a trend toward association with p-Akt expression (P = 0.095). When known clinical variables were added to a multivariate analysis, only age, Karnofsky performance score, and p-MAPK expression emerged as independent prognostic factors. Conclusions: p-MAPK and activated members of the Akt pathway are markers of outcome in glioblastoma. Elevated expression of p-MAPK is associated with increased radiation resistance and represents an independent prognostic factor in these tumors.
- Subjects :
- Adult
MAPK/ERK pathway
Oncology
Cancer Research
medicine.medical_specialty
Pathology
Adolescent
medicine.medical_treatment
Kaplan-Meier Estimate
Cohort Studies
Adipokines
Predictive Value of Tests
Lectins
Internal medicine
medicine
Humans
Chitinase-3-Like Protein 1
Phosphorylation
Protein kinase A
Protein kinase B
Survival rate
PI3K/AKT/mTOR pathway
Aged
Glycoproteins
Retrospective Studies
Aged, 80 and over
business.industry
TOR Serine-Threonine Kinases
Ribosomal Protein S6 Kinases, 70-kDa
Middle Aged
Prognosis
Immunohistochemistry
Survival Rate
Radiation therapy
Treatment Outcome
Mitogen-Activated Protein Kinases
Signal transduction
Glioblastoma
business
Protein Kinases
Proto-Oncogene Proteins c-akt
Follow-Up Studies
Signal Transduction
Subjects
Details
- ISSN :
- 15573265 and 10780432
- Volume :
- 12
- Database :
- OpenAIRE
- Journal :
- Clinical Cancer Research
- Accession number :
- edsair.doi.dedup.....1038d17e7d53603132b7ff1d7652eb6c