Markedly negative correlation between miR-17-5p and NTN4 mRNA in BC lesions in a database analysis. A. An analysis of NTN4 mRNA expression in 113 normal breast tissues and 1109 BC tissues in the TCGA database. B. miR-17-5p expression in 104 normal breast specimens and 1103 BC samples from the data in TCGA. C. Serum miR-17-5p expression in GSE73002, including 2686 noncancer controls and 1280 BC samples, ***P < 0.001. D, E. Correlations between miR-17-5p and NTN4 mRNA in TCGA (1066 pairs of samples, P < 0.0001) and GSE22220 (207 pairs of tissues, P = 0.010). F, G. Survival analysis of miR-17-5p and NTN4 in BC with a Kaplan-Meier plotter. H, I. Progression-free survival of miR-17-5p and NTN4 in GSE22220.