Changes in relative cerebral blood volume 1 month after radiation-temozolomide therapy can help predict overall survival in patients with glioblastoma.
OBJECTIVE
To evaluate perfusion parameter changes in patients with glioblastoma multiforme by comparing the perfusion magnetic resonance (MR) imaging measurements obtained before combined radiation and temozolomide therapy (RT-TMZ) with the follow-up MR imaging measurements obtained 1 month after completion of this treatment.


METHODS
Institutional review board approval was obtained, and HIPAA guidelines were followed. The data of 36 patients (24 male [median age, 63 years]; 12 female [median age, 59 years]) with glioblastoma multiforme who were treated with RT-TMZ were retrospectively reviewed. The hypothesis was that a change in relative cerebral blood volume (rCBV) 1 month after RT-TMZ is predictive of overall survival. Linear regression analysis was performed to correlate changes in tumor size and perfusion parameters with overall survival. Receiver operating characteristic (ROC) curves were evaluated for 1-year survival. Overall survival was assessed with Kaplan-Meir survival curves and log-rank testing.


RESULTS
Percentage change in rCBV at 1 month after RT-TMZ correlated with overall survival. Increased rCBV after treatment was a strong predictor of poor survival (median survival, 235 days versus 529 days with decreased rCBV) (P < .008, log-rank test). The ROC curves for 1-year survival showed a greater area under the curve (0.806; 95% confidence interval [CI]: 0.698, 0.970) (P = .005) with rCBV than with tumor size (0.556; 95% CI: 0.342, 0.729) (P = .382). The overall survival for patients with increased tumor size, based on Macdonald criteria, was shorter than that for patients who showed no progression (stable or partial response), but the difference was not significant (median survival, 442 days versus 598 days) (P = .761, log-rank test).


CONCLUSIONS
Change in rCBV after RT-TMZ appears to correlate with overall survival.
Mangla
Rajiv
R
Department of Imaging Sciences, University of Rochester Medical Center, 601 Elmwood Ave, PO Box 648, Rochester, NY 14642-8648, USA.
Singh
Gurshawn
G
Ziegelitz
Doerthe
D
Milano
Michael T
MT
Korones
David N
DN
Zhong
Jianhui
J
Ekholm
Sven E
SE
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D018906:Antineoplastic Agents, Alkylating / Q000627:therapeutic use; D001810:Blood Volume; D001932:Brain Neoplasms / Q000175:diagnosis / Q000401:mortality* / Q000628:therapy*; D003606:Dacarbazine / Q000031:analogs & derivatives* / Q000627:therapeutic use; D005260:Female; D005909:Glioblastoma / Q000175:diagnosis / Q000401:mortality* / Q000628:therapy*; D006801:Humans; D015994:Incidence; D008279:Magnetic Resonance Imaging / Q000706:statistics & numerical data; D008297:Male; D008875:Middle Aged; D020266:Radiotherapy, Conformal / Q000401:mortality*; D016019:Survival Analysis; D015996:Survival Rate; D000077204:Temozolomide; D016896:Treatment Outcome
D018906:Antineoplastic Agents, Alkylating; D003606:Dacarbazine; D000077204:Temozolomide