Thus, t(4; 11) nearly always occurs in ALL, t(9; 11) is mostly associated with AML, as are t(11; 19)(q23;p13.1), t(6;11), t(10;11) and the partial duplications. t(11; 19)(q23;p13.3) occurs in both AML and ALL. ALL1-associated ALLs are characterised as CD10???, CD19+ and by B-cell precursor phenotype (pro B), with a high frequency of myeloid-associated (CD15 and/or CD65) antigen expression.