Subgroup analysis showed that STAT5a expression was significantly associated with favorable overall survival in breast (lnHR = −0.7805 [−1.1394, −0.4215], P-value < 0.000), lung (lnHR = −0.3255 [−0.6427, −0.0083], P-value = 0.0443), and bladder cancer (lnHR = −0.8689 [−1.4087, −0.3292], P-value = 0.0016) (Figure 5). This evidence concerns the gene STAT5A and urinary bladder carcinoma.