%0 Journal Article
%T Nomogram for radiation-induced lymphopenia in patients receiving intensity-modulated radiotherapy based-chemoradiation therapy for newly diagnosed glioblastoma: A multi-institutional study.
%A Kim N
%A Lee J
%A Shin H
%A Shin J
%A Nam DH
%A Lee JI
%A Seol HJ
%A Kong DS
%A Choi JW
%A Chong K
%A Lee WJ
%A Chang JH
%A Kang SG
%A Moon JH
%A Cho J
%A Lim DH
%A Yoon HI
%J Clin Transl Radiat Oncol
%V 47
%N 0
%D 2024 Jul
%M 38884005
%F 4.739
%R 10.1016/j.ctro.2024.100799
%X <B>UNASSIGNED: </B>Severe lymphopenia (SLP) has emerged as a significant prognostic factor in glioblastoma. Intensity-modulated radiation therapy (IMRT)-based radiation therapy (RT) is suggested to minimize the risk of SLP. This study aimed to evaluate SLP incidence based on multi-institutional database in patients with GBM treated with IMRT and develop a predictive nomogram.<BR><B>UNASSIGNED: </B>This retrospective study reviewed data from 348 patients treated with IMRT-based concurrent chemoradiation therapy (CCRT) at two major hospitals from 2016 to 2021. After multivariate regression analysis, a nomogram was developed and internally validated to predict SLP risk.<BR><B>UNASSIGNED: </B>During treatment course, 21.0% of patients developed SLP and SLP was associated with poor overall survival outcomes in patients with GBM. A newly developed nomogram, incorporating gender, pre-CCRT absolute lymphocyte count, and brain mean dose, demonstrated fair predictive accuracy (AUC 0.723).<BR><B>UNASSIGNED: </B>This study provides the first nomogram for predicting SLP in patients with GBM treated with IMRT-based CCRT, with acceptable predictive accuracy. The findings underscore the need for dose optimization and radiation planning to minimize SLP risk. Further external validation is crucial for adopting this nomogram in clinical practice.