[Preconceptional and prenatal exposure to tobacco smoke and risk of childhood cancer].

The aim of the paper was to evaluate the association between preconceptional and prenatal exposure to tobacco smoke and the risk of all cancers combined and separately, for brain tumors, leukemias, lymphomas and other childhood cancers. We conducted systematic search of the literature using PUBMED, MEDLINE and EBSCO database to identify all publications dealing with environmental tobacco smoke exposure and childhood cancer.