Data preprocessing and selection
tumor
TUMOR
Variables for each nonmetastatic CC patient include age at diagnosis, marital status, race, histological type, differentiation grade, stage of the tumor, surgery at the primary site, regional lymph node surgery, use of RT and CT, size of the tumor, as well as the status of survival were retrieved and analyzed. The data extracted from the database were preprocessed to prepare them for modeling based on the classification methods applied in our previous studies.