Funnel plot for publication bias in an association analysis of SK1 expression among cancer, adjacent non-cancer, and benign tissues.

<p>Begg’s linear regression test was used, and P = 0.059, 0.009, 0.040, and 0.176 in a subgroup analysis of SK1 positivity and high expression in cancer and non-cancer tissues, respectively (<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0090362#pone-0090362-g002" target="_blank">Figure 2</a>).