A, change in Ki-67 expression (percent of cells staining positive) over the course of the intervention. A, change in Ki-67 expression (percent of cells staining positive) over the course of the intervention. Baseline aspiration values are shown on the x-axis; repeat aspiration on the y-axis. The line represents no change in value; symbols above the line denote an increase and symbols below the line a decrease. P value via Wilcoxon signed rank test. B, change in Masood semiquantitative cytology index score over the course of the intervention. Baseline aspiration values are shown on the x-axis; repeat aspiration on the y-axis. The line represents no change in value; symbols above the line denote an increase and symbols below the line a decrease. P value via Wilcoxon signed rank test. Carol J. Fabian et al. Cancer Prev Res 2015;8:922-931 ©2015 by American Association for Cancer Research