Micro RNA (miRNA) expression levels of predictive miRs in the prophylactic CLND subgroup (n = 237). Tukey boxplots showing medians, interquartile range (IQR), and whiskers extending to 1.5 × IQR showing the inverse dCt values of (a) miR-146-3p, (b) miR-146-5p, and (c) miR-222 relative to miR-16. Outliers are represented by circles. CLND, central lymph node dissection; LN(+), lymph node–positive group; LN(–), lymph node–negative group.