IL7 and neoplasm: Variables found significantly associated with fold change in IL-7 concentration (dependent variable), that is, dichotomized tumor location (GC encoded as 1, and EC and CRC encoded as 0), dichotomized stage (Stages 1 and 2 encoded as 0, and Stages 3 and 4 encoded as 1), and lymph-node involvement were entered into analysis as explanatory variables.