['To determine whether the pattern of progressive disease (PD) for glioblastoma multiforme (GBM) patients has changed with the introduction of the current standard of care protocol - postoperative conformal radiotherapy to a dose of 60 Gray in 30 fractions with concurrent low-dose (75-100\u2009mg/m(2) ) temozolomide, followed by six cycles of adjuvant high-dose (150-200\u2009mg/m(2) ) temozolomide - as compared with radiotherapy alone.', "For GBM patients commencing combined modality treatment between October 2005 and August 2009, the MRI scan confirming progression (if any) was co-registered with the original planning CT scan, and progression site(s) marked. Coverage of the composite progression volume (PDvol) by the original 95% prescription isodose volume was obtained from dose-volume histogram (DVH) data, and assigned as 'central', 'in field', 'marginal' and 'out of field', corresponding to >95%, >80%, 20-80% and <20% coverage.", 'Of 68 consecutive patients identified, 54 (79.4%) had documented PD. Of the 47 (87%) evaluable patients, 43 (91%) had in field progression with 36 (77%) of these being central. Of the remaining four cases, three (6%) had marginal progression, and only one patient (2%) had out of field progression. Median overall and progression-free survival were 11.6 and 6.6\u2009months, respectively.'] Does the addition of temozolomide change the pattern of progression of glioblastoma multiforme post-radiotherapy?