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Up-regulation of PTK7 in metastatic HCC. (A) The evaluation of PTK7 expression in metastatic vs nonmetastatic HCC samples in GSE45114, by Student t test. (B) The expression of PTK7 in primary tumor and portal vein tumor thrombus (PVTT) tissue of HCC patients was evaluated against that of paired normal tissue using the GSE77509 data set, by paired t test. P values (∗P < .05, ∗∗P < .01, ∗∗∗P < .001).
