Cancer-related Problem/Condition Clinical Trial
Official title:
Integrative Molecular Analysis of Individual Radiosensitivity Among a Population of Pediatric Patients Treated With Radiation in Eastern France.
This study aims to explore prospectively the distribution of individual radiosensitivity in the pediatric population and to determine the predictive power of individual radiosensitivity biomarkers from an immunofluorescence technique on primary dermal fibroblasts
900 children and adolescents benefit from radiation each year in France. The mean age at diagnosis is 5 years; life expectancy for the 80% of them who could cure is long, and the incidence of radiation-related acute and mainly late complications - not evaluated to date - could exceed that of adults. Dysfunction of irradiated organs and growth disorders are specific to the pediatric subpopulation. Individual radiosensitivity of children and adolescents is unknown at this time, probably with large variability depending on the age when considering the changes in metabolic functions throughout growth. These complications are largely attributable to inter individual constitutional variations of cellular response to DNA damage. Subject to radiation-induced DNA damages such as double-strand breaks (DSB), cells reacts by triggering a whole series of phosphorylation events coordinated within multi protein complexes whose interplay is still misknown (DNA damage response i.e. DDR). Indirect Immunofluorescence cell scanning has revolutionized radiation biology research by permitting the detection of individual DSB in each cell nucleus in a dose range from 1 mGy to 10 Gy. This technique has notably confirmed that yield of unrepaired DSB is correlated with cell RS. From a broad spectrum of human radiosensitive skin fibroblast cell lines, the Inserm CRU 1052 team proposed a general model of DSB signaling and repair and a molecular assay to stratify patients according to their individual RS. ARPEGE biomarqueurs is a prospective multicenter study to prospectively evaluate with this assay the RS of children and adolescents treated over a year in all pediatric oncology departments of the Region Grand Est and set thresholds in this population. 150 children are thus potentially includable in different centers. The assay will be performed on primary fibroblasts cultured from a skin biopsy taken at diagnosis. The RS of patients will be measured in blind. Confusion factors such as irradiated volume, skin phototype, previous chemotherapy regimen, smoking, comorbities (diabetes, immunodeficiency, chronic inflammatory disease ...) will be reported. In parallel the RT-acute toxicity will be reported according to NCI-CTCAE v4.0 reference scale three months of the completion of RT then periodically during 15 years. Screening hypersensitive patients would be a major step forward in the management of cancers, opening a view to personalized medicine. ;
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