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Hematol Oncol. 2017 Dec;35(4):608-618. doi: 10.1002/hon.2347. Epub 2016 Sep 19.

Mortality and survival patterns of childhood lymphomas: geographic and age-specific patterns in Southern-Eastern European and SEER/US registration data.

Author information

1
Department of Hygiene, Epidemiology and Medical Statistics, School of Medicine, University of Athens, Athens, Greece.
2
National Cancer Registry of Ukraine, National Institute of Cancer, Kiev, Ukraine.
3
Childhood Cancer Sub-registry of Belarus, Belarusian Research Center for Pediatric Oncology, Hematology and Immunology, Minsk, Belarus.
4
Bulgarian National Cancer Registry, National Oncology Hospital, Sofia, Bulgaria.
5
Institute of Public Health of Serbia, Belgrade, Serbia.
6
Izmir Cancer Registry, Izmir Hub, Izmir & Hacettepe University Institute of Public Health, Izmir, Turkey.
7
North Region Cancer Registry of Portugal (RORENO), Portuguese Oncology Institute of Porto, Porto, Portugal.
8
Croatian National Cancer Registry, Croatian National Institute of Public Health, Zagreb, Croatia.
9
Cancer Registry of Republic of Slovenia, Institute of Oncology, Ljubljana, Slovenia.
10
Central Region Cancer Registry of Portugal (ROR-Centro), Portuguese Oncology Institute of Coimbra, Coimbra, Portugal.
11
Cyprus Cancer Registry-Health Monitoring Unit, Ministry of Health, Nicosia, Cyprus.
12
Department of Health Information and Research, Malta National Cancer Registry, Pieta, Malta.
13
Regional Cancer Registry of Iasi, National Institute of Public Health, Iasi, Romania.
14
Regional Cancer Registry of Cluj, Oncological Institute "Ion Chiricuta", Cluj-Napoca, Romania.
15
Oncology Department, "Mitera" Children's Hospital, Athens, Greece.
16
Second Department of Pediatrics, Aristotelian University of Thessaloniki, AHEPA General Hospital, Thessaloniki, Greece.
17
Department of Pediatric Hematology and Oncology, Hippokration Hospital, Thessaloniki, Greece.
18
Haematology-Oncology Unit, First Department of Pediatrics, Athens University Medical School, "Aghia Sophia" Children's Hospital, Athens, Greece.
19
Department of Pediatric Haematology-Oncology, "Aghia Sophia" Children's Hospital, Athens, Greece.
20
Department of Pediatric Hematology-Oncology, University of Crete, University Hospital of Heraklion, Heraklion, Greece.
21
Department of Pediatric Hematology-Oncology, "Pan. & Agl. Kyriakou" Children's Hospital, Athens, Greece.

Abstract

Childhood (0-14 years) lymphomas, nowadays, present a highly curable malignancy compared with other types of cancer. We used readily available cancer registration data to assess mortality and survival disparities among children residing in Southern-Eastern European (SEE) countries and those in the United States. Average age-standardized mortality rates and time trends of Hodgkin (HL) and non-Hodgkin (NHL; including Burkitt [BL]) lymphomas in 14 SEE cancer registries (1990-2014) and the Surveillance, Epidemiology, and End Results Program (SEER, United States; 1990-2012) were calculated. Survival patterns in a total of 8918 cases distinguishing also BL were assessed through Kaplan-Meier curves and multivariate Cox regression models. Variable, rather decreasing, mortality trends were noted among SEE. Rates were overall higher than that in SEER (1.02/106 ), which presented a sizeable (-4.8%, P = .0001) annual change. Additionally, remarkable survival improvements were manifested in SEER (10 years: 96%, 86%, and 90% for HL, NHL, and BL, respectively), whereas diverse, still lower, rates were noted in SEE. Non-HL was associated with a poorer outcome and an amphi-directional age-specific pattern; specifically, prognosis was inferior in children younger than 5 years than in those who are 10 to 14 years old from SEE (hazard ratio 1.58, 95% confidence interval 1.28-1.96) and superior in children who are 5 to 9 years old from SEER/United States (hazard ratio 0.63, 95% confidence interval 0.46-0.88) than in those who are 10 to 14 years old. In conclusion, higher SEE lymphoma mortality rates than those in SEER, but overall decreasing trends, were found. Despite significant survival gains among developed countries, there are still substantial geographic, disease subtype-specific, and age-specific outcome disparities pointing to persisting gaps in the implementation of new treatment modalities and indicating further research needs.

KEYWORDS:

SEER; Southern-Eastern Europe; cancer registration; childhood lymphoma; mortality; survival

PMID:
27641612
DOI:
10.1002/hon.2347
[Indexed for MEDLINE]

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