FISH-negative BCR::ABL1-positive e19a2 chronic myeloid leukaemia: the most cryptic of insertions oleh Philippa C. May, Alistair G. Reid, Mark E. Robinson, Jamshid S. Khorashad, Dragana Milojkovic, Simone Claudiani, Genomics England Research Consortium, Fenella Willis, Jane F. Apperley, Andrew J. Innes