Levetiracetam for Seizure Prevention After Brain Tumor Surgery

Seizures are a common complication in brain tumor patients, particularly after supratentorial craniotomy, with approximately two-thirds occurring within the first postoperative month and affecting both early recovery and long-term outcomes. Although prophylactic ASMs are widely used in practice, there is no consensus on whether routine prophylaxis is necessary or on the optimal regimen. Major societies generally conclude that evidence is insufficient to recommend for or against routine use, while some national guidance provides conditional suggestions only for "high-risk" patients-highlighting the lack of robust data. Real-world studies also show high but heterogeneous use and no unified standard. A high-quality randomized trial is therefore required to determine the necessity, efficacy, and safety of routine prophylaxis. The PREVENT trial is a multicenter, randomized, double-blind, placebo-controlled, parallel-group study designed to evaluate the efficacy and safety of levetiracetam in adults undergoing supratentorial tumor resection without a prior seizure history, and thereby to assess the need for routine perioperative prophylaxis. Participants are randomized 1:1 with center-stratified block allocation. The dosing regimen is: one intravenous dose 1 hour preoperatively and another on the evening after surgery, followed by oral/NG maintenance (0.5 g twice daily) through postoperative month 3; the control arm receives matching placebo. Standard antiseizure treatment is provided if seizures occur and these events are recorded as endpoints. Scheduled assessments occur at screening, day of surgery, postoperative day 7, month 3 (±7 days), and month 6 (±10 days). The primary endpoint is clinical seizures within 3 months after surgery, adjudicated by predefined criteria. Secondary endpoints are subclinical seizures within 7 days and 3 months (based on standardized EEG review). Exploratory endpoints include direct medical costs and direct non-medical/indirect costs at 3 months, and clinical seizures within 6 months. Safety endpoints include adverse events, serious adverse events, and death through 3 months. The principal null hypothesis is no difference between groups. Efficacy is analyzed primarily in the full analysis set (FAS) with per-protocol (PPS) as supportive; center effects are modeled, two-sided α=0.05, and results reported as risk differences with 95% CIs and relative risks. The planned sample size is 558 participants across \~10 centers, with independent safety oversight. This trial will provide robust randomized evidence on the necessity, benefits, risks, and economic impact of routine perioperative prophylaxis to guide standardized clinical practice.