In the ALL group, patients with ETV6/RUNX1 gene fusion (also known as TEL/AML1) had higher levels of analyzed modifications in urine, and for 5-hmdC, 5-hmCyt, 5-fCyt and 5-hmUra, the differences were significant (Table S3 in Supplementary Materials). Here, ETV6 is linked to acute lymphoblastic leukemia.