Background We report here the first population-based incidence rates and prognosis of primary central nervous system lymphoma (PCNSL) in Finland. Methods Finnish Cancer Registry data by histological diagnosis and tumor location (2007–2017) for cases with diffuse large B-cell lymphoma. Results During 2007–2017, 392 new cases of PCNSL were reported (195 males, 197 females). The average age-adjusted incidence was 0.68/100,000 person-years. Incidence for males was 0.74/100,000 and for females 0.63/100,000, respectively. The incidence was highest, 2.93/100,000, among people aged 75–79 years. Concerning all cases in 2007–2017 the 2-year age-adjusted relative survival rate was 33% and the corresponding 5-year survival rate was 26%. Among patients under the age of 70, the age-adjusted 5-year relative survival rate increased from 36% in 2007–2012 to 43% for 2013–2017. Among patients aged 70+ the corresponding survival rates were poor, 7 and 9%. Conclusions PCNSL incidence in Finland is among the highest reported in the world. The annual increase in incidence was 2.4%. The prognosis is still dismal, especially in elderly patients.

Primary central nervous system lymphoma is a rare but aggressive brain malignancy. It is associated with poor prognosis even with the current standard of care. The aim of this study was to evaluate the effect and tolerability of blood–brain barrier disruption treatment combined with high-dose treatment with autologous stem cell transplantation as consolidation on primary central nervous system lymphoma patients. We performed a prospective phase II study for 25 patients with previously untreated primary central nervous system lymphoma. The blood–brain barrier disruption treatment was initiated 3–4 weeks after the MATRix regimen using the previously optimized therapy protocol. Briefly, each chemotherapy cycle included two subsequent intra-arterial blood–brain barrier disruption treatments on days 1 and 2 via either one of the internal carotid arteries or vertebral arteries. Patients received the therapy in 3-week intervals. The treatment was continued for two more courses after achieving a maximal radiological response to the maximum of six courses. The complete treatment response was observed in 88.0% of the patients. At the median follow-up time of 30 months, median progression-free and overall survivals were not reached. The 2-year overall and progression-free survival rates were 67.1% and 70.3%, respectively. Blood–brain barrier disruption treatment is a promising option for primary central nervous system lymphoma with an acceptable toxicity profile.

PurposeWe report here the first population-based incidence rates and prognosis of primary central nervous system lymphoma (PCNSL) in Finland. MethodsFinnish Cancer Registry data by histological diagnosis and tumor location (2007-2017) for cases with diffuse large B-cell lymphoma.ResultsDuring 2007–2017, 416 new cases of PCNSL were reported (202 males, 214 females). The average age-adjusted incidence in males vs. females for 2007-2009, 2010-2012, 2013-2015 and 2016-2017 was 0.57/100,000 vs. 0.48/100,000 person-years, 0.66/100,000 vs. 0.55/100,000, 0.53/100,000 vs. 0.63/100,000, and 0.76/100,000 vs. 0.66/100,000 respectively. The incidence was highest, 3.27/100,000, among people aged 75–79 years. From 2007–2012 to 2013–2017, the 2-year age-adjusted survival rate increased from 36% to 41%, and the 4-year survival rates from 31% to 37%. Among patients aged 70+ years, the corresponding 2-year survival rates were 25% and 29%, and the 4-year survival rates 25% and 22%.ConclusionAge-adjusted incidence of PCNSL increased from 0.57/100,000 (2007–2012) to 0.63/100,000 (2013–2017). The annual increase was 3.8% being among the highest reported in the world. The prognosis was poor, although a minor improvement in 4-year survival was found.

Background: We report here the first population-based incidence rates and prognosis of primary central nervous system lymphoma (PCNSL) in Finland. Methods: Finnish Cancer Registry data by histological diagnosis and tumor location (2007-2017) for cases with diffuse large B-cell lymphoma.Results: During 2007–2017, 392 new cases of PCNSL were reported (195 males, 197 females). The average age-adjusted incidence was 0.68/100.000 person-years. Incidence for males was 0.74/100.000 and for females 0.63/100.000, respectively. The incidence was highest, 2.93/100.000, among people aged 75–79 years. Concerning all cases in 2007-2017 the 2-year age-adjusted relative survival rate was 35% and the corresponding 5-year survival rate was 28%. Among patients under the age of 70, the age-adjusted 5-year relative survival rate increased from 36% in 2007-2012 to 43% for 2013-2017. Among patients aged 70+ the corresponding survival rates were poor, 7% and 9%.Conclusions: PCNSL incidence in Finland is among the highest reported in the world. The annual increase in incidence was 2.4%. The prognosis is still dismal, especially in elderly patients.