Pair-wise correlation of log-transormed LC50 values of prednisolone (PRD), vincristine (VCR), asparaginase (ASP) and daunorubicin (DNR) with corresponding rho by Spearman's Rank correlation (*P<0.0001). Cross-sensitive (green) and cross-resistant (red) patients correspond to the top and bottom quartile by first component of the PCA; illustrated in black are the patients categorized as intermediates.
