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Results about CLL are partly consistent with a previous hospital-based case�Ccontrol investigation by Montella et al.[18] who reported a protective effect of measles on the risk of developing non-Hodgkin's lymphoma in an adult population https://www.selleckchem.com/products/BI-2536.html in Italy diagnosed between 1999 and 2002. Cases included the small cell lymphoma subtype that, according to the adopted classification system (Working Formulation[19]), also included CLL. However, the authors did not report any analysis for this specific subgroup. Moreover, a clear association with the number of infections was not found. A recent pooled analysis of more than 12,000 cases and 15,000 controls from 17 datasets in Europe and Northern America (including that of Montella et al.[18] and part of the present database) has confirmed the protective role of childhood infectious diseases on the risk of developing non-Hodgkin's lymphomas in subjects aged 16 years or more.[20] Previous studies that specifically addressed the risk of adult AML in association with https://www.selleckchem.com/products/Cyclopamine.html childhood infectious diseases are rare and generally reported a higher risk for subjects with some infection, but with conflicting results. A large population-based case�Ccontrol study, carried out in the USA and in Canada at the end of the 1980s, reported an excess risk of AML in association with childhood infections, especially measles.[21] The risk increased when the analyses were restricted to infections occurred in early childhood (i.e., https://www.selleck.cn/products/gsk126.html a very large register-based case�Ccontrol investigation in Sweden including 9,129 cases with AML, diagnosed between 1965 and 2004, 1,662 with myelodisplastic syndromes, diagnosed between 1993 and 2004, and 42,878 population-based controls reported a small statistically significant association between the risk of both diseases and a previous history of infections (OR = 1.3 for both malignancies).[23] These results are suggestive of a potential role of immunostimulation by infectious agent in the aetiology of myeloid leukaemia. Unfortunately, childhood diseases were not included among the considered diseases. Conversely, Larfors et al.[24] in another large register-based investigation in Sweden reported a negative association between the risk of adult AML, diagnosed between 1962 and 2008, and the number of siblings, which could represent an indirect measure of exposure to infectious agents.