627. Aggressive Lymphoma (Diffuse Large B-Cell and Other Aggressive B-Cell Non-Hodgkin Lymphomas)—Results from Retrospective/Observational Studies:

PCNSL Treatment and Prognosis and CNS Prophylaxis in High-Risk Aggressive Lymphomas

Watch Session

476 Real World (RW) Outcomes and Prognostication of Older Patients with Primary Central Nervous System Lymphoma (PCNSL) in the Contemporary Era

Kevin A. David, Suchitra Sundaram, Seo-Hyun Kim, et al.

Conclusions: Older pts with PCNSL have suboptimal outcomes, with 2/3 progressing in the first several years. GA is an important prognostic tool, and could be used to stratify pts in future investigations. In addition, use of Rtx, increasing MTX dose, and the MTR regimen were associated with improved outcomes.

Robert Puckrin, Haidar El Darsa, Sunita Ghosh, et al.

Conclusion: The APLCPG high-risk criteria of CNS-IPI 4-6, double hit lymphoma, or testicular involvement identify patients with DLBCL at significantly increased risk of CNS relapse. The risk of CNS relapse was similar for all high-risk patients (11.8%) and those who received prophylactic HD-MTX (11.2%) in our study relative to previously published data for patients who did not receive CNS prophylaxis (10-12%). Based on this analysis, we could not demonstrate a benefit to the current practice of prophylactic HD-MTX. However, the lower rate of CNS relapse and improved PFS and OS in patients who received consolidative autotransplant in our study suggests that optimizing frontline therapy to achieve better systemic disease control may be a more effective strategy to reduce the risk of CNS relapse than prophylactic HD-MTX alone.

Victor M. Orellana-Noia, Daniel R Reed, Jeremy M Sen, et al.

Conclusion: Use of single-route ppx demonstrated similar CNSrel vs established outcomes for this population in the rituximab era, with no difference by PPx route. CNSrel remains a rare but devastating complication, with greater risk even after single-route PPx in those with higher EN burden and inv of key EN sites.