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Published on: July 31, 2017
Biopsy versus partial versus gross total resection in older patients with high-grade glioma: a systematic review and
Saleh A Almenawer1, Jetan H Badhiwala1, Waleed Alhazzani1
1Division of Neurosurgery, McMaster University, Hamilton, Ontario, Canada (S.A.A., A.A., E.K., A.C., P.K., T.G., O.A., K.R., S.K.S., N.K.M.); Department of Clinical Epidemiology and Biostatistics, McMaster University, Hamilton, Ontario, Canada (S.A.A., W.A., F.F.); Department of Medicine, McMaster University, Hamilton, Ontario, Canada (W.A.); Department of Oncology, McMaster University, Hamilton, Ontario, Canada (J.G.); Stem Cell and Cancer Research Institute, McMaster University, Hamilton, Ontario, Canada (S.K.S.); Division of Neurosurgery, University of Toronto, Toronto, Ontario, Canada (J.H.B.); Department of Radiation Oncology, Dalhousie University, Halifax, Nova Scotia, Canada (W.S.); Department of Neurological Surgery, University of Texas Southwestern Medical Center, Dallas, Texas (B.Y.).
Background:
Optimal extent of surgical resection (EOR) of high-grade gliomas (HGGs) remains uncertain in the elderly given the unclear benefits and potentially higher rates of mortality and morbidity associated with more extensive degrees of resection.
Methods:
We undertook a meta-analysis according to a predefined protocol and systematically searched literature databases for reports about HGG EOR. Elderly patients (≥60 y) undergoing biopsy, subtotal resection (STR), and gross total resection (GTR) were compared for the outcome measures of overall survival (OS), postoperative karnofsky performance status (KPS), progression-free survival (PFS), mortality, and morbidity. Treatment effects as pooled estimates, mean differences (MDs), or risk ratios (RRs) with corresponding 95% confidence intervals (CIs) were determined using random effects modeling.
Results:
A total of 12 607 participants from 34 studies met eligibility criteria, including our current cohort of 211 patients. When comparing overall resection (of any extent) with biopsy, in favor of the resection group were OS (MD 3.88 mo, 95% CI: 2.14-5.62, P < .001), postoperative KPS (MD 10.4, 95% CI: 6.58-14.22, P < .001), PFS (MD 2.44 mo, 95% CI: 1.45-3.43, P < .001), mortality (RR = 0.27, 95% CI: 0.12-0.61, P = .002), and morbidity (RR = 0.82, 95% CI: 0.46-1.46, P = .514) . GTR was significantly superior to STR in terms of OS (MD 3.77 mo, 95% CI: 2.26-5.29, P < .001), postoperative KPS (MD 4.91, 95% CI: 0.91-8.92, P = .016), and PFS (MD 2.21 mo, 95% CI: 1.13-3.3, P < .001) with no difference in mortality (RR = 0.53, 95% CI: 0.05-5.71, P = .600) or morbidity (RR = 0.52, 95% CI: 0.18-1.49, P = .223).
Conclusions:
Our findings suggest an upward improvement in survival time, functional recovery, and tumor recurrence rate associated with increasing extents of safe resection. These benefits did not result in higher rates of mortality or morbidity if considered in conjunction with known established safety measures when managing elderly patients harboring HGGs.
