PURPOSE: The clinical significance of epidermal growth factor receptor variant III (EGFRvIII) expression in glioblastoma multiforme (GBM) and its relationship with other key molecular markers are not clear. We sought to evaluate the clinical significance of GBM subtypes as defined by EGFRvIII status. PATIENTS AND METHODS: The expression of EGFRvIII was assessed by immunohistochemistry in 649 patients with newly diagnosed GBM. These data were then examined in conjunction with the expression of phospho-intermediates (in a subset of these patients) of downstream AKT and Ras pathways and YKL-40 as well as with known clinical risk factors, including the Radiation Therapy Oncology Group's recursive partitioning analysis (RTOG-RPA) class. RESULTS: The RTOG-RPA class was highly predictive of survival in EGFRvIII-negative patients but much less predictive in EGFRvIII-positive patients. These findings were seen in both an initial test set (n = 268) and a larger validation set (n = 381). Similarly, activation of the AKT/MAPK pathways and YKL-40 positivity were predictive of poor outcome in EGFRvIII-negative patients but not in EGFRvIII-positive patients. Pair-wise combinations of markers identified EGFRvIII and YKL-40 as prognostically important. In particular, outcome in patients with EGFRvIII-negative/YKL-40-negative tumors was significantly better than the outcome in patients with the other three combinations of these two markers. CONCLUSION: Established prognostic factors in GBM were not predictive of outcome in the EGFRvIII-positive subset, although this requires confirmation in independent data sets. GBMs negative for both EGFRvIII and YKL-40 show less aggressive behavior.
PURPOSE: The clinical significance of epidermal growth factor receptor variant III (EGFRvIII) expression in glioblastoma multiforme (GBM) and its relationship with other key molecular markers are not clear. We sought to evaluate the clinical significance of GBM subtypes as defined by EGFRvIII status. PATIENTS AND METHODS: The expression of EGFRvIII was assessed by immunohistochemistry in 649 patients with newly diagnosed GBM. These data were then examined in conjunction with the expression of phospho-intermediates (in a subset of these patients) of downstream AKT and Ras pathways and YKL-40 as well as with known clinical risk factors, including the Radiation Therapy Oncology Group's recursive partitioning analysis (RTOG-RPA) class. RESULTS: The RTOG-RPA class was highly predictive of survival in EGFRvIII-negative patients but much less predictive in EGFRvIII-positive patients. These findings were seen in both an initial test set (n = 268) and a larger validation set (n = 381). Similarly, activation of the AKT/MAPK pathways and YKL-40 positivity were predictive of poor outcome in EGFRvIII-negative patients but not in EGFRvIII-positive patients. Pair-wise combinations of markers identified EGFRvIII and YKL-40 as prognostically important. In particular, outcome in patients with EGFRvIII-negative/YKL-40-negative tumors was significantly better than the outcome in patients with the other three combinations of these two markers. CONCLUSION: Established prognostic factors in GBM were not predictive of outcome in the EGFRvIII-positive subset, although this requires confirmation in independent data sets. GBMs negative for both EGFRvIII and YKL-40 show less aggressive behavior.
Authors: John H Sampson; Amy B Heimberger; Gary E Archer; Kenneth D Aldape; Allan H Friedman; Henry S Friedman; Mark R Gilbert; James E Herndon; Roger E McLendon; Duane A Mitchell; David A Reardon; Raymond Sawaya; Robert J Schmittling; Weiming Shi; James J Vredenburgh; Darell D Bigner Journal: J Clin Oncol Date: 2010-10-04 Impact factor: 44.544
Authors: Fabio M Iwamoto; Andreas F Hottinger; Sasan Karimi; Elyn Riedel; Jocelynn Dantis; Maryam Jahdi; Katherine S Panageas; Andrew B Lassman; Lauren E Abrey; Martin Fleisher; Lisa M DeAngelis; Eric C Holland; Adília Hormigo Journal: Neuro Oncol Date: 2011-08-10 Impact factor: 12.300
Authors: Khatri Latha; Ming Li; Vaibhav Chumbalkar; Anupama Gururaj; YeoHyeon Hwang; Sumana Dakeng; Raymond Sawaya; Kenneth Aldape; Webster K Cavenee; Oliver Bogler; Frank B Furnari Journal: Int J Cancer Date: 2012-07-09 Impact factor: 7.396
Authors: Kwanghee Kim; James M Brush; Philip A Watson; Nicholas A Cacalano; Keisuke S Iwamoto; William H McBride Journal: Mol Cancer Res Date: 2008-03 Impact factor: 5.852