Figure 7: Verification of the validity of the penalized Cox’s proportional hazards model using actual microarray survival data. Three actual microarray data sets for ovarian cancer were used. A. The cancer genome atlas (TCGA) data set [6] was used as the training data set; B. Tothill’s data set [7] was used as a validation data set; and C. Bonome’s data set [8] was used as a validation data set.