However, among infants diagnosed with KMT2A-rearranged ALL, the presence of p53 mutations is rare: Agraz-Doblas et al. [10] identified p53 mutations in 2 out of 49 patient samples, and Andersson et al. [11], found 2 out of 47 primary KMT2A-rearranged infant ALL samples to carry a mutation in p53. The gene discussed is TP53; the disease is acute lymphoblastic leukemia.