CtDNA for Early Response Assessment in PCNSL Treated with 1st Line Curative Intent (NLG-PCNSL-01)

This is an international, prospective, multicenter trial with the aim of characterizing circulating tumor DNA (ctDNA) for early response assessment in PCNSL patients treated with standard of care (SOC) 1st line therapy with a curative intent (Figure 1). Secondary endpoints are to assess the clinical characteristics, health-related quality of life (HRQoL), neurological status, and outcome of newly diagnosed primary central nervous system lymphoma (PCNSL) patients in the Nordic countries. Patients eligible for a curative intent SOC 1st line therapy, such as MATRix + high-dose chemotherapy and autologous stem cell transplantation (HDCT/ASCT), are eligible for the trial. Diagnostic tumor tissue, cerebrospinal fluid (CSF), and plasma samples are collected for ctDNA and translational analyses with the aim describing new prognostic and predictive biomarkers. Treatment responses are assessed with the International PCNSL Collaborative Group (IPCG) response criteria, and diagnostic and response assessment magnetic resonance imaging (MRI) images are centrally analyzed in order to describe new prognostic and predictive markers.