Keywords: Tumors, CancerA subset of primary central nervous system lymphoma (PCNSL) may show early relapsed/refractory (R/R) disease after treatments. This study investigated the role of pretreatment apparent diffusion coefficient (ADC) values for the prediction of R/R in PCNSL. Total 52 patients with pathologically confirmed PCNSL were included, and 24 (46.2%) patients developed R/R (median time to relapse, 13 months) after treatment. The results showed female sex, complete response to first-line chemotherapy, and ADC value/ratio were significant predictors of R/R in PCNSL. Pretreatment ADC values/ratios offer objective and valuable evaluation for the treatment planning in PCNSL.
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