CRLF2 and acute lymphoblastic leukemia: In contrast with ALL Hispanic children from Los Angeles [20], in the present study, the P2RY8::CRLF2 deletion was more frequent than the IGH::CRLF2 rearrangement; whereas, our IGH::CRLF2 frequency was close to the one reported by the mentioned group (9.6% vs. 12%, respectively), and it might be higher, considering that 21 patients with CRLF2 overexpression could not be included due to the lack of cell samples available for an additional FISH analysis.