Leukemia, the most common childhood cancer, remains poorly understood despite extensive research. This project utilizes Finnish national registry data to investigate factors influencing risk and survival of the disease. Data includes 1496 childhood leukemia cases diagnosed in Finland in 1990–2019, matched with 4488 controls by sex and age. Conditional logistic regression analyses will estimate the associations between childhood leukemia and the concerned factors, adjusting for confounders.