Final report from Intergroup NCCTG 86-72-51 (Alliance): a phase III randomized clinical trial of high-dose versus low-dose radiation for adult low-grade glioma

Neuro-Oncology - Tập 22 Số 6 - Trang 830-837 - 2020
William G. Breen1, S. Keith Anderson2, Xiomara W. Carrero2, Paul D. Brown1, Karla V. Ballman3, Brian Patrick O’Neill1, Walter J. Curran4, Ross A. Abrams5, Nadia N. Laack1, Ralph Levitt6, Evanthia Galanis1, Jan C. Buckner1, Edward G. Shaw7
1Mayo Clinic, Rochester, Minnesota
2Alliance Statistics and Data Center, Mayo Clinic, Rochester, Minnesota
3Weill Medical College of Cornell University, New York, New York
4Emory University School of Medicine, Atlanta, Georgia
5Rush University Medical Center, Chicago, Illinois
6Fargo Clinic, North Fargo, North Dakota
7Wake Forest Baptist Health, Winston-Salem, North Carolina

Tóm tắt

AbstractBackgroundThe optimal radiation dose for adult supratentorial low-grade glioma is unknown. The aim of this study was to provide a final update on oncologic and cognitive outcomes of high-dose versus low-dose radiation for low-grade glioma.MethodsBetween 1986 and 1994, 203 patients with supratentorial low-grade glioma were randomized (1:1) to 50.4 Gy in 28 fractions versus 64.8 Gy in 36 fractions after any degree of resection.ResultsFor all patients, median overall survival (OS) was 8.4 years (95% CI: 7.2–10.8). Median progression-free survival (PFS) was 5.2 years (95% CI: 4.3–6.6). Median follow-up is 17.2 years for the 33 patients still alive. High-dose radiation did not improve 15-year OS (22.4%) versus low-dose radiation (24.9%, log-rank P = 0.978) or 15-year PFS (high dose, 15.2% vs low dose, 9.5%; P = 0.7142). OS was significantly better for patients with preoperative tumor diameter <5 cm and baseline Mini-Mental State Examination (MMSE) >27 and who underwent gross total resection. PFS was improved for patients with oligodendroglioma versus astrocytoma, preoperative tumor diameter <5 cm, patients who had gross total resection, and patients with baseline MMSE >27. For patients who had normal MMSE at baseline, at 7 years only 1 patient (5%) had a clinically significant decrease in MMSE from the previous time point, with the remainder (95%) stable. None had decrease in MMSE at 10, 12, or 15 years.ConclusionsLong-term follow-up indicates no benefit to high-dose over low-dose radiation for low-grade gliomas. Cognitive function appeared to be stable after radiation as measured by MMSE.

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