Using statistical analysis, correlation between five factors (the expression of EGFR in the cellular membranes, the expression of ER, PR, and PCNA in the nucleus and the size of the tumor [Fig. 4]) was detected using nonparametric correlation analysis (Spearman’s rank correlation) on 10 combined paired comparisons (5C2=10). The gene discussed is EGFR; the disease is neoplasm.