Impact of Race and Age and their Interaction on Survival Outcomes in Patients With Diffuse Large B-Cell Lymphoma

Survival outcomes and healthcare utilization between immigrant patients and Danish-born patients with hematological cancers: a Danish population-based study

Overall survival (OS) for patients with a hematological cancer may differ between immigrant and Danish-born patients due to disparities in socioeconomic status, health literacy, and language proficiency. This cohort study aimed to investigate survival and hospitalization according to immigrant status while controlling for confounders. Patients with newly diagnosed hematological cancer in 2000-2020 were identified in the Danish nationwide hematological registers and stratified into Danish-born, Western, and non-Western patients. Patients were followed from diagnosis until death, 31st December 2021, or emigration, whichever came first. Crude OS, standardized OS, and 5-years OS differences were computed using flexible parametric models and hazard ratios using Cox regression. Number of hospitalization days in the year before and after diagnosis, respectively, were calculated using Poisson regression. A total of 2,241 immigrants and 41,519 Danish-born patients with a hematological cancer were included. Standardized 5-years OS was similar between groups with 58% (95% confidence interval 57-58%) for Danish-born patients, 57% (55-60%) for Western, and 56% (53-58%) for non-Western immigrant patients. Subgroup analyses identified OS differences in selected subgroups. Non-Western immigrant patients had 1.3 (0.5-2.1) more hospitalization days in the year before diagnosis and an adjusted incidence rate ratio of hospitalization days of 1.14 (1.13-1.15) in the year after diagnosis compared with Danish-born patients. In conclusion, there were no overall differences in survival when comparing immigrant patients to Danish-born patients after controlling for relevant confounders. Healthcare utilization was slightly higher among non-Western immigrant patients before and after diagnosis, but differences were small on an individual patient level.

Racial disparities in the incidence and survival outcomes in diffuse large B-cell lymphoma in adolescents and young adults

Diffuse large B-cell Lymphoma (DLBCL) is an aggressive subtype of non-Hodgkin lymphoma (NHL). The disease generally occurs in older patients. Although at a lower prevalence, the disease also occurs in the adolescent and young adult group (AYA). There is paucity of data in the literature on racial and ethnic disparities in the incidence and survival outcomes of DLBCL in the AYA group. The objective of our study is to demonstrate the disparities in these outcomes. Utilizing SEER, we obtained data on patient demographics, incidence, and survival from 2000 to 2020. We observed statistically significant reduced incidence of DLBCL in all racial groups, except the non-Hispanic Asian and Pacific Islander group (NHAPI). The non-Hispanic Black group (NHB) had one of the lowest survival despite showing the largest decrease in incidence in DLBCL. The differences in the survival could be secondary to socioeconomic factors, however other reasons need to be explored. The increased incidence among the NHAPI group mirrors that of large population-based studies in East Asian countries, however, underlying reasons have not been elucidated.