Incidence and outcomes of primary central nervous system lymphoma in solid organ transplant recipients

Primary central nervous system lymphoma (PCNSL) risk is greatly increased in immunosuppressed human immunodeficiency virus–infected people. Using data from the US transplant registry linked with 17 cancer registries (1987‐2014), we studied PCNSL and systemic non‐Hodgkin lymphoma (NHL) in 288 029 solid organ transplant recipients. Transplant recipients had elevated incidence for PCNSL compared with the general population (standardized incidence ratio = 65.1; N = 168), and this elevation was stronger than for systemic NHL (standardized incidence ratio=11.5; N = 2043). Compared to kidney recipients, PCNSL incidence was lower in liver recipients (adjusted incidence rate ratio [aIRR] = 0.52), similar in heart and/or lung recipients, and higher in other/multiple organ recipients (aIRR = 2.45). PCNSL incidence was higher in Asians/Pacific Islanders than non‐Hispanic whites (aIRR = 2.09); after induction immunosuppression with alemtuzumab (aIRR = 3.12), monoclonal antibodies (aIRR = 1.83), or polyclonal antibodies (aIRR = 2.03); in recipients who were Epstein‐Barr virus–seronegative at the time of transplant and at risk of primary infection (aIRR = 1.95); and within the first 1.5 years after transplant. Compared to other recipients, those with PCNSL had increased risk of death (adjusted hazard ratio [aHR] = 11.79) or graft failure/retransplantation (aHR = 3.24). Recipients with PCNSL also had higher mortality than those with systemic NHL (aHR = 1.48). In conclusion, PCNSL risk is highly elevated among transplant recipients, and it carries a poor prognosis.