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Gondi, Vinai; Pugh, Stephanie L; Tome, Wolfgang A; Caine, Chip; Corn, Ben; Kanner, Andrew; Rowley, Howard; Kundapur, Vijayananda; DeNittis, Albert; Greenspoon, Jeffrey N; Konski, Andre A; Bauman, Glenn S; Shah, Sunjay; Shi, Wenyin; Wendland, Merideth; Kachnic, Lisa; Mehta, Minesh P
Journal of clinical oncology, 12/2014, Letnik: 32, Številka: 34Journal Article
Hippocampal neural stem-cell injury during whole-brain radiotherapy (WBRT) may play a role in memory decline. Intensity-modulated radiotherapy can be used to avoid conformally the hippocampal neural stem-cell compartment during WBRT (HA-WBRT). RTOG 0933 was a single-arm phase II study of HA-WBRT for brain metastases with prespecified comparison with a historical control of patients treated with WBRT without hippocampal avoidance. Eligible adult patients with brain metastases received HA-WBRT to 30 Gy in 10 fractions. Standardized cognitive function and quality-of-life (QOL) assessments were performed at baseline and 2, 4, and 6 months. The primary end point was the Hopkins Verbal Learning Test-Revised Delayed Recall (HVLT-R DR) at 4 months. The historical control demonstrated a 30% mean relative decline in HVLT-R DR from baseline to 4 months. To detect a mean relative decline ≤ 15% in HVLT-R DR after HA-WBRT, 51 analyzable patients were required to ensure 80% statistical power with α = 0.05. Of 113 patients accrued from March 2011 through November 2012, 42 patients were analyzable at 4 months. Mean relative decline in HVLT-R DR from baseline to 4 months was 7.0% (95% CI, -4.7% to 18.7%), significantly lower in comparison with the historical control (P < .001). No decline in QOL scores was observed. Two grade 3 toxicities and no grade 4 to 5 toxicities were reported. Median survival was 6.8 months. Conformal avoidance of the hippocampus during WBRT is associated with preservation of memory and QOL as compared with historical series.
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