MTHFR and Decreased total leukocyte count: This finding aligns with those of a study conducted in 2014 in Slovenia on a cohort of 30 European children with NHL, which reported an association between the MTHFR rs1801133 AA/AG genotypes (A vs. GG) and leukopenia (p = 0.006), as well thrombocytopenia (p = 0.041) [19].