Graphical illustration of myeloid antigen positivity in childhood B-precursor ALL. For each antigen, positive cases are represented by a colored form. The areas of the forms roughly correspond to the frequency of positive cases (observed numbers of patients are marked in red) while the shapes are constructed to illustrate the respective coexpressions. An arbitrary cutoff value of 20% is used for all antigens. The CD66c positivity correlates with negativity of any of the following: CD33 (p = 0.002), CD13 (p < 0.0001) and CD65 (p = 0.029). There was a significant correlation between CD33 and CD13 positivity (p < 0.0001) and between CD15 and CD65 positivity (p = 0.0002) whereas the positivity of no other two antigens of the ones shown correlated significantly with each other. Total number of B-precursor cases illustrated is 365.