Surg-11. risks and benefits of repeated resection for glioblastoma: a single institution review of characteristics and outcomes of resection of recurrent glioblastoma

Erin D’Agostino, Isidora Beach,Brandon D. Liebelt,Alissa A. Thomas

Neuro-oncology(2023)

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Abstract
Abstract Maximal safe resection is standard for newly diagnosed glioblastoma, but for recurrent glioblastoma the value of resection is less clear. We performed a retrospective, single-institution analysis of sequential patients undergoing re-resection for recurrent glioblastoma and analyzed pre-operative risk factors, progression free and overall survival from time of re-resection to death or last follow-up (PFS/OS), and complication rates. Between 2017 and 2022, 38 patients underwent re-resection of glioblastoma (defined by 2016 WHO criteria, 86.8% IDH wild type) and were followed for an average of 157 weeks (range 17-553). The cohort had a mean age of 59.4 years (range 39-87), was 55% male, and included 68.4% MGMT unmethylated tumors. Preoperatively, median Karnofsky Performance Score (KPS) was 80 (range 50-100), and median modified frailty index (mFI-5) was 0 (range 0-4). Re-resection occurred an average of 55.3 weeks after initial resection (SD 59.6, range 5-314), 25.0 weeks after chemotherapy (SD 51.8), and 39.9 weeks after radiation (SD 45.1). Mean OS after re-resection was 67.4 weeks (SD 91.5, range 1-505 weeks), median 59.5 weeks. Average PFS was 24.5 weeks (SD 25.3, range 1-139). The complication rate was 34.2% (n = 15), including 6 patients (15.8%) with a wound infection and 5 (13.1%) with symptomatic hemorrhage. 12 (31.6%) patients had a new neurologic deficit. Postoperative KPS was lower than preoperative KPS (p = .002). Patients with <20 weeks between surgeries, mFI >1, or KPS <80 had higher rates of complications (respectively p = .04, p = .03, p = .03). Patients with mFI >1 or KPS <70 were more likely to die within 30-days of surgery (respectively p = .014; p = .018). Re-resection demonstrated a survival benefit, especially for patients younger than 65 with a mFI of < 2. Though complications were common, post-operative complications were not associated with a shorter overall survival. Consideration for age, frailty, KPS, and timing of surgery may guide selection of patients for re-resection.
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Key words
recurrent glioblastoma,repeated resection
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