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Effects of decreased PSA on tumorigenesis and metastasis of C4‐2 cells in vivo. A, Inhibited PSA expression obviously slowed down tumorigenesis (P < .001). n = 7. Scale bar = 1 cm. B, Interfered PSA shrank metastatic tumour area in mice lungs (P < .001), with treatment of HE staining. n = 7. Scale bar = 200 μm. ** shows P < .01
