CDX1 and mesenchymal chondrosarcoma: As demonstrated by Nyquist et al, the chromosomal translocation t(1;5)(q42;q32) resulted in fusion of IRF2BP2 (located on 1q42) with CDX1 (on 5q32) to generate an IRF2BP2-CDX1 fusion gene in the mesenchymal chondrosarcoma they studied (12).