Regression analysis showed no association between the percentage of ABCG2-positive tumor cells and patient survival, overall (R2 = 0.003, p = 0.52, r = 0.06) as well as in patients who underwent chemotherapy (R2 = 0.03, p = 0.16, r = 0.16) or radiotherapy (R2 = 0.002, p = 0.65, r = 0.05) (Figure 2). The gene discussed is ABCG2; the disease is neoplasm.