Together with significantly higher proportions of 5q and 7q deletions in XP-C leukemia (P = 1.024e−06 for 5q and P = 0.002985 for 7q deletions, Fisher’s exact test, two-sided), this may indicate that the studied leukemia cases are close to TP53 mutated with complex karyotype subgroup according to Papaemmanuil et al.16. Here, TP53 is linked to Xeroderma pigmentosum complementation group C.