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1.
Artigo em Inglês | MEDLINE | ID: mdl-33829352

RESUMO

BACKGROUND: Several studies have addressed the potential seasonality of childhood acute leukaemia (AL) without conclusive results. Using data from the National Registry of Childhood Cancers over 1990-2014 in mainland France, we investigated the seasonal variations in childhood AL taken together, and lymphoblastic (ALL) and myeloid (AML) leukaemia separately. METHODS: Assuming constant variations over 1990-2014, we used a Poisson regression model to evaluate variations in standardized incidence ratios (SIRs) by month of birth or diagnosis. A scan method for temporal cluster detection was used to identify windows of several consecutive months with high or low SIR. The yearly reproducibility of the observed monthly variations was then evaluated. RESULTS: We included 11,528 AL, of which 9493 ALL and 1,843 AML. No seasonal variation was detected for ALL. With a clear seasonal pattern, differences in AML incidence rates were evidenced between January-April and May-December birth periods (SIR = 0.85, 95% CI 0.77-0.94 and SIR = 1.07, 95% CI 1.01-1.14, respectively). AML incidence variations by month of diagnosis were less clear-cut. CONCLUSION: Based on a large number of cases from a high-quality registry, we did not evidence any seasonality in ALL incidence rates but evidenced seasonal variations in AML incidence rates by month of birth.

2.
Cancer Epidemiol ; 68: 101797, 2020 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-32882568

RESUMO

BACKGROUND: Few studies have assessed the relation between maternal prenatal pesticides use and childhood lymphoma risk, some reporting a positive association with non-Hodgkin lymphoma (NHL). We investigated the association between maternal exposure to pesticides during pregnancy and childhood Hodgkin (HL) and non-Hodgkin lymphoma. METHODS: We pooled data from the two French national population-based case-control studies ESCALE (2003-2004) and ESTELLE (2010-2011). Data on domestic and occupational exposures to pesticides during pregnancy were obtained through standardised maternal interviews. Logistic regression models were used to compute odds ratios (OR) and 95% confidence intervals (CI) for HL and NHL, by pesticide category adjusted for potential confounders. Analyses by histological subtypes were also performed. RESULTS: We included 328 H L, 305 non-Hodgkin NHL and 2,415 controls. Around 40% of control mothers reported having used pesticides during index pregnancy, of whom 95% reported insecticides use. Maternal use of herbicides and fungicides occurred mostly in combination with insecticides. Insecticides use was more frequently reported in cases than controls (ORNHL = 1.6 [95%CI 1.3-2.1], p = 0.0001; ORHL = 1.3 [95%CI 1.0-1.7], p = 0.03). This association appeared more marked for Burkitt lymphoma and mixed cellularity classical HL. No obvious association was observed with occupational pesticides exposure during pregnancy. CONCLUSION: These results suggest that maternal domestic use of insecticides during pregnancy might be related to both childhood NHL and HL. Further larger studies are urgently needed.

4.
Environ Res ; 187: 109517, 2020 08.
Artigo em Inglês | MEDLINE | ID: mdl-32438101

RESUMO

BACKGROUND: Pesticide exposure is suspected to play a role in the etiology of childhood leukemia (AL). Various sources of exposure have been explored, but few studies have investigated the risk of childhood AL in relation to residential exposure to agricultural pesticides. Since around 50% of France is agricultural land, with marked pesticide use, France is a suitable location to investigate for an association. We aimed to analyze the association between the agricultural crop density in the municipalities of France and the incidence of childhood AL between 1990 and 2014. METHODS: 11,487 cases of AL diagnosed in children aged 0-14 years were registered by the French National Registry of Childhood Hematological Malignancies over 1990-2014. National agricultural census data for 1990, 2000 and 2010 were used to estimate the densities of the most common crops in France. The incidence of AL was estimated in the 35,512 municipalities, by age and gender, and 3 observation periods, and expressed as the standardized incidence ratio (SIR). RESULTS: We observed a moderate log-linear association between viticulture density and the incidence of AL, with a 3% increase in SIR for a 10% increase in viticulture density (SIRR = 1.03; 95%CI [1.00-1.06]). The association remained for lymphoblastic AL but not for myeloid AL. The association was stable after stratification by geographic area, age and period, and after adjustment on UV radiation and a French deprivation index. No consistent association was observed for other crop types. DISCUSSION: This nationwide study shows a moderate increase in incidence of childhood AL in municipalities where viticulture is common. Future individual studies are needed to know whether this observation is confirmed and related to particular use of pesticides.


Assuntos
Leucemia , Praguicidas , Adolescente , Agricultura , Criança , Pré-Escolar , Cidades , Produtos Agrícolas , França/epidemiologia , Humanos , Incidência , Lactente , Recém-Nascido , Praguicidas/toxicidade
5.
Cancer Epidemiol ; 65: 101697, 2020 04.
Artigo em Inglês | MEDLINE | ID: mdl-32155583

RESUMO

BACKGROUND: On average 185 children are diagnosed each year in France with a cancer in their first year of life, representing 11 % of cancers diagnosed in children less than 15 years. METHODS: A retrospective population-based observational study was conducted between 2000 and 2014 of all infants with a diagnosis of cancer using the National Registry of Childhood Cancers Database. RESULTS: Out of 2760 cases of primary cancers in infancy, there were mainly neuroblastomas 30.1 %), central nervous system (CNS) tumors (16.1 %), leukemias (15.3 %), retinoblastomas (11.6 %), and Wilms tumors (6.9 %). Embryonal malignancies accounted for 55.2 % of cases. Most diagnoses showed a male excess, particularly for malignant gonadal germ-cell tumors (GCT) with a 17.5 sex-ratio. The annual incidence rate, 242.9 per million infants overall, was stable over the study period for all types of cancer. Most deaths occurred within the first month of life (70.8 % of deaths). The 5-year overall survival (5-y OS) was 81.0 % (95 %CI, 79.4-82.4) with large contrasts between diagnoses. The best 5-y OS (>85 %) were observed for retinoblastomas, carcinomas, nephroblastomas, GCT, neuroblastomas, and hepatoblastomas. Conversely, the lowest 5-y OS (<65 %) were observed for acute myeloid leukemias, CNS tumors, and lymphoid leukemias. We observed no substantial change over time (80.5 % [95 %CI, 77.7-82.9] in 2000-2004 and 82.6 % [95 %CI, 80.0-84.9] in 2010-2014) for all cancers combined. The same result has been found whatever the diagnostic group. CONCLUSION: Our results contribute to better understand these tumors by quantifying their impact on the French population and assessing the burden of some devastating infant cancers.


Assuntos
Neoplasias/epidemiologia , Feminino , França/epidemiologia , Humanos , Incidência , Lactente , Recém-Nascido , Masculino , Neoplasias/mortalidade , Estudos Retrospectivos , Análise de Sobrevida
6.
Cancer Med ; 7(10): 5299-5314, 2018 10.
Artigo em Inglês | MEDLINE | ID: mdl-30230715

RESUMO

BACKGROUND: Significant increases in childhood cancer incidence since the 1970s have been consistently reported worldwide, but the persistence of the increase on recent periods is discussed. No conclusion can be drawn concerning the spatial variations of childhood cancer, either. This study is an in-depth investigation of the spatial and temporal variations of childhood cancer in France. An extensive review of all the studies published since 2000 on those issues is provided. METHODS: The study included 25 877 cases of childhood cancer registered nationwide over 2000-2014. The spatial heterogeneity (overdispersion, autocorrelation, overall heterogeneity) was tested, on two geographic scales, and two spatial scan methods were used to detect clusters of cases. The annual average percent change (AAPC) in incidence rate was estimated with Poisson regression models, and joinpoint analyses were considered. RESULTS: Glioma and non-Hodgkin lymphoma cases exhibited some spatial heterogeneity and two large clusters were detected. Overall, the incidence rate of childhood cancer was stable over 2000-2014 (AAPC = -0.1% [-0.3%; 0.2%]). A log-linear positive trend was significantly evidenced for gliomas other than pilocytic astrocytomas (AAPC = 1.8% [0.9%; 2.7%]), with some suggestion of a leveling-off at the end of the period, while Burkitt lymphoma and germ cell tumor incidence rates decreased (AAPC = -2.2% [-3.8%; -0.5%] and AAPC = -1.9% [-3.4%; -0.3%], respectively). No spatial heterogeneity or significant time variation was evidenced for other cancers. CONCLUSION: Several types of childhood cancer displayed some spatial heterogeneity and two large clusters were detected, the origins of which are to be investigated and might include differences in case ascertainment. Overall, the results do not support a sustained increase in incidence rates of childhood cancer in recent years.


Assuntos
Neoplasias/classificação , Neoplasias/epidemiologia , Criança , Análise por Conglomerados , Feminino , França/epidemiologia , Humanos , Incidência , Masculino , Sistema de Registros , Análise Espaço-Temporal
7.
Cancer Causes Control ; 28(10): 1075-1083, 2017 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-28770363

RESUMO

BACKGROUND: In a previous nationwide ecological study based on 20 years of registration and 7,443 cases of acute lymphoblastic leukemia (ALL), we reported a positive association between residential solar ultraviolet (UV) light at diagnosis and childhood precursor B-cell acute lymphoblastic leukemia (PBC-ALL). OBJECTIVE: The present study investigated the influence of suspected individual risk factors for ALL on the association between UV and PBC-ALL, and evaluated this association at the residence at birth. METHODS: Individual data collected by interviews in the ESCALE (2003-2004) and ESTELLE (2010-2011) nationwide case-control studies, which included 1,511 cases of leukemia aged less than 15 years and 3,102 population controls, were analyzed. Municipalities of residences at birth and at diagnosis/interview were extracted and assigned UV radiation exposure from the EUROSUN database. The potential confounders or effect modifiers considered were strongly suspected risk factors for ALL that were available in the ESCALE and ESTELLE studies. RESULTS: UV exposure at diagnosis was associated with PBC-ALL (OR = 1.27 [1.08-1.48]) for UV > 105.5 J/cm2 compared to UV ≤ 105.5 J/cm2. Considering exposure to UV at birth rather than at diagnosis/inclusion yielded almost identical results as both variables were strongly correlated. Taking into account the suspected ALL risk factors did not affect this association in the pooled study. CONCLUSION: Our findings suggest that our previous observation of an ecological association between residential UV radiation exposure at diagnosis and PBC-ALL was not confounded or modified by individual risk factors, and that the critical exposure time window may be prenatal.


Assuntos
Habitação , Leucemia-Linfoma Linfoblástico de Células Precursoras/epidemiologia , Exposição à Radiação , Raios Ultravioleta , Adolescente , Estudos de Casos e Controles , Criança , Pré-Escolar , Humanos , Lactente , Recém-Nascido , Fatores de Risco
8.
Environ Health Perspect ; 125(4): 714-720, 2017 04.
Artigo em Inglês | MEDLINE | ID: mdl-27483500

RESUMO

BACKGROUND: Exposures to high-dose ionizing radiation and high-dose rate ionizing radiation are established risk factors for childhood acute leukemia (AL). The risk of AL following exposure to lower doses due to natural background radiation (NBR) has yet to be conclusively determined. METHODS: AL cases diagnosed over 1990-2009 (9,056 cases) were identified and their municipality of residence at diagnosis collected by the National Registry of Childhood Cancers. The Geocap study, which included the 2,763 cases in 2002-2007 and 30,000 population controls, was used for complementary analyses. NBR exposures were modeled on a fine scale (36,326 municipalities) based on measurement campaigns and geological data. The power to detect an association between AL and dose to the red bone marrow (RBM) fitting UNSCEAR (United Nations Scientific Committee on the Effects of Atomic Radiation) predictions was 92%, 45% and 99% for exposure to natural gamma radiation, radon and total radiation, respectively. RESULTS: AL risk, irrespective of subtype and age group, was not associated with the exposure of municipalities to radon or gamma radiation in terms of yearly exposure at age reached, cumulative exposure or RBM dose. There was no confounding effect of census-based socio-demographic indicators, or environmental factors (road traffic, high voltage power lines, vicinity of nuclear plants) related to AL in the Geocap study. CONCLUSIONS: Our findings do not support the hypothesis that residential exposure to NBR increases the risk of AL, despite the large size of the study, fine scale exposure estimates and wide range of exposures over France. However, our results at the time of diagnosis do not rule out a slight association with gamma radiation at the time of birth, which would be more in line with the recent findings in the UK and Switzerland.


Assuntos
Radiação de Fundo , Leucemia Induzida por Radiação/epidemiologia , Exposição à Radiação/estatística & dados numéricos , Criança , Feminino , França/epidemiologia , Raios gama , Habitação/estatística & dados numéricos , Humanos , Masculino , Radiação Ionizante , Radônio , Medição de Risco
9.
Paediatr Perinat Epidemiol ; 30(6): 612-622, 2016 11.
Artigo em Inglês | MEDLINE | ID: mdl-27555468

RESUMO

BACKGROUND: Socio-economic status is related to many life style and environmental factors, some of which have been suggested to influence the risk of childhood cancer. Studies requiring subject participation are usually hampered by selection of more educated parents. To prevent such bias, we used unselected nationwide Geographical Information System (GIS)-based registry data, to investigate the influence of socio-economic disparities on the risk of childhood cancer. METHODS: The Geocap study included all French residents diagnosed with cancer aged up to 15 years over the period 2002-2010 (15 111 cases) and 45 000 contemporaneous controls representative of the childhood population. Area socio-economic characteristics used to calculate the European Deprivation Index (EDI) were based on census data collected on the fine scale of the Merged Islet for Statistical Information (IRIS). RESULTS: Overall, the risk of acute lymphoblastic leukaemia (ALL) was lower in the most deprived quintile than in the other quintiles of EDI (ORQ5vs

Assuntos
Neoplasias/epidemiologia , Adolescente , Distribuição por Idade , Estudos de Casos e Controles , Criança , Pré-Escolar , França/epidemiologia , Humanos , Lactente , Recém-Nascido , Estilo de Vida , Leucemia-Linfoma Linfoblástico de Células Precursoras/epidemiologia , Sistema de Registros , Características de Residência/estatística & dados numéricos , Fatores de Risco , Saúde da População Rural/estatística & dados numéricos , Fatores Socioeconômicos , Saúde da População Urbana/estatística & dados numéricos
10.
Am J Epidemiol ; 182(8): 685-93, 2015 Oct 15.
Artigo em Inglês | MEDLINE | ID: mdl-26377958

RESUMO

Childhood leukemia may be associated with traffic-related environmental exposure to benzene, and additional data are needed. The Géolocalisation des Cancers Pédiatriques (GEOCAP) Study, a nationwide French case-control study, was designed to avoid selection bias due to differential participation and misclassification. The study compared the 2,760 childhood leukemia cases diagnosed in France between 2002 and 2007 (including 2,275 cases of acute lymphoblastic leukemia (ALL) and 418 cases of acute myeloblastic leukemia (AML)) with 30,000 contemporaneous child population controls. The residence addresses were precisely geocoded, and 3 indicators of residential proximity to traffic were considered. Estimates of benzene concentrations were also available for the Île-de-France region (including Paris). A 300-m increase in major road length within 150 m of the geocoded address was significantly associated with AML (odds ratio = 1.2, 95% confidence interval: 1.0, 1.4) but not with ALL (odds ratio = 1.0, 95% confidence interval: 0.9, 1.1), and the association was reinforced in the Île-de-France region when this indicator was combined with benzene estimates. These results, which were free from any participation bias and based on objectively determined indices of exposure, showed an increased incidence of AML associated with heavy-traffic road density near a child's home. The results support a role for traffic-related benzene exposure in the etiology of childhood AML.


Assuntos
Poluição do Ar/efeitos adversos , Benzeno/toxicidade , Carcinógenos/toxicidade , Leucemia Mieloide Aguda/epidemiologia , Leucemia-Linfoma Linfoblástico de Células Precursoras/epidemiologia , Características de Residência/estatística & dados numéricos , Emissões de Veículos/toxicidade , Adolescente , Estudos de Casos e Controles , Criança , Pré-Escolar , Feminino , França/epidemiologia , Habitação/estatística & dados numéricos , Humanos , Incidência , Lactente , Leucemia Mieloide Aguda/induzido quimicamente , Masculino , Leucemia-Linfoma Linfoblástico de Células Precursoras/induzido quimicamente , Medição de Risco , Fatores de Risco , População Urbana/estatística & dados numéricos
11.
Cancer Causes Control ; 26(9): 1339-49, 2015 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-26169300

RESUMO

PURPOSE: Few studies have investigated the relationship between solar ultraviolet radiation (UV) and childhood hematological malignancies (CHM). This study addresses the associations between residential UV exposure at diagnosis and the incidence of types and subtypes of CHM, by age and gender, in France, over a long period, on the fine scale of the 36,326 Communes that constitute mainland France. METHODS: The 9,082 cases of acute leukemia and 3,563 cases of lymphoma diagnosed before the age of 15 years from 1990 to 2009 were provided by the French National Registry of Childhood Hematological Malignancies. The incidence of CHM was calculated by Commune, year, age and gender and expressed as the standardized incidence ratio (SIR). UV data from 1988 to 2007 were extracted from the EUROSUN database. RESULTS: The annual daily average UV exposure of the children ranged from 85.5 to 137.8 J/cm(2). For each additional 25 J/cm(2), there was a significant increase in precursor B-cell acute lymphoblastic leukemia (PBC-ALL) in children aged less than 5 years (SIR 1.18; 95% CI 1.10-1.27). Further analysis of PBC-ALL in the young children suggested a better fit of models with a threshold, with the risk increasing above 100 J/cm(2), for which the SIR was 1.24 (95% CI 1.14-1.36) for a 25 J/cm(2) increase. The results remained stable in analyses stratifying by deprivation index or degree of urbanization of the Communes. CONCLUSION: The study suggests that higher residential UV exposure may be positively associated with a higher incidence of PBC-ALL in early childhood.


Assuntos
Leucemia/epidemiologia , Linfoma/epidemiologia , Raios Ultravioleta/efeitos adversos , Adolescente , Criança , Pré-Escolar , Feminino , França/epidemiologia , Humanos , Incidência , Lactente , Recém-Nascido , Leucemia/etiologia , Linfoma/etiologia , Masculino , Sistema de Registros
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