PRIMARY THERAPY AND SURVIVAL OF FOLLICULAR LYMPHOMA IN THE NETHERLANDS: A POPULATION-BASED ANALYSIS AMONG 12,008 PATIENTS DIAGNOSED FROM 1989 TO 2016
Author(s): ,
Manette Dinnessen
Affiliations:
Department of Research,Netherlands Comprehensive Cancer Organisation,Utrecht,Netherlands
,
Marjolein van der Poel
Affiliations:
Department of Internal Medical,Maastricht University Medical Center,Maastricht,Netherlands
,
Sanne Tonino
Affiliations:
Department of Hematology,Amsterdam UMC,Amsterdam,Netherlands
,
Otto Visser
Affiliations:
Department of Registration,Netherlands Comprehensive Cancer Organisation,Utrecht,Netherlands
,
Nicole Blijlevens
Affiliations:
Department of Hematology,Radboud University Medical Center,Nijmegen,Netherlands
,
Marie José Kersten
Affiliations:
Department of Hematology,Amsterdam UMC,Amsterdam,Netherlands
,
Pieternella Lugtenburg
Affiliations:
Department of Hematology,Erasmus MC Cancer Institute,Rotterdam,Netherlands
Avinash Dinmohamed
Affiliations:
Department of Research,Netherlands Comprehensive Cancer Organisation,Utrecht,Netherlands;Department of Registration,Netherlands Comprehensive Cancer Organisation,Utrecht,Netherlands;Department of Public Health,Erasmus University Medical Center,Rotterdam,Netherlands;Department of Hematology,Amsterdam UMC,Amsterdam,Netherlands
EHA Library. Dinnessen M. Jun 15, 2019; 266867; PS1250
Manette Dinnessen
Manette Dinnessen
Contributions
Abstract

Abstract: PS1250

Type: Poster Presentation

Presentation during EHA24: On Saturday, June 15, 2019 from 17:30 - 19:00

Location: Poster area

Background

Follicular lymphoma (FL) is a heterogenous malignancy, reflected, in part, by the highly variable clinical course. Major advances over the past decades in diagnosis, classification, and management—especially the introduction of rituximab—have significantly contributed to improved survival among patients with FL. At present, however, population-based studies that comprehensively assessed the contribution of these advances on survival according to disease stage are scarce.

Aims

The aim of this nationwide population-based study was to assess trends in primary therapy and survival among patients with FL in the Netherlands during a 28-year period.

Methods
We selected all adult (≥18 years) FL patients diagnosed between 1989-2016 from the nationwide Netherlands Cancer Registry (NCR), with survival follow-up till January 1, 2018. Data on primary therapy—i.e. no anti-neoplastic therapy, treatment with a chemotherapeutic backbone (CT), radiotherapy (RT) only, and other/unknown therapy—started within one year after diagnosis were available in the NCR. Information on the use of rituximab was available for patients diagnosed from 2007. We calculated relative survival (RS) and the relative excess risk of mortality up to five years after diagnosis to estimate disease-specific survival. All analyses were performed separately for stages I-II (i.e. limited stage; n=4,350; median age, 63 years) and stages III-IV (i.e. advanced stage; n=7,658; median age, 61 years) disease, and stratified by calendar period (1989-1995, 1996-2002, 2003-2008, and 2009-2016) and age (18-60, 61-70, and >70 years). The periods were selected based on the availability of rituximab in the Netherlands, which was introduced in the Netherlands in 2003

Results

In limited-stage FL the use of CT decreased with each calendar period, following an increased proportion of patients that did not receive anti-neoplastic therapy within one year after diagnosis (Fig 1A). Throughout the entire study period, around one-third of patients across the three age groups received RT alone (Fig 1A). Trends in therapy among patients with advanced-stage FL followed patterns akin to limited-stage FL. However, in advanced-stage FL, RT only was rarely applied, whereas CT was commonly applied (Fig 1A). During 2007-2016, ≥95% of the CT-treated patients in the three age groups across both stages received rituximab.

Five-year RS improved significantly over time across the three age groups and both stage groups (Fig 1B-C). Overall, when adjusted for age, sex, and year of follow-up, patients with limited- and advanced-stage FL diagnosed in 2009-2016 had 49% and 61% lower excess mortality, as compared with patients diagnosed in 1996-2002, respectively (P<.05). The survival improvement was generally greater among patients with advanced-stage FL and patients aged >70 years. Of note, 5-year RS was ~90% among patients with limited-stage FL diagnosed in 2009-2016. This was independent of age.

Conclusion

In summary, in this nationwide population-based study, survival among patients with FL improved considerably over time, particularly among patients with advanced-stage FL and older age groups. Most notably, patients with limited-stage FL diagnosed in 2009-2016 rarely experience excess mortality within five years after diagnosis. Collectively, the improvements in survival may be accounted for by changes and advances in therapy over time¾particularly the introduction of rituximab in 2003¾and improvements in supportive care, staging techniques, and risk-adapted therapy.

Session topic: 18. Indolent and mantle-cell non-Hodgkin lymphoma - Clinical

Keyword(s): Epidemiology, Follicular lymphoma, Survival, Therapy

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