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Forest plots of odds ratios for P21 expression and clinicopathological parameters including lymph node metastasis, invasion, and apoptosis index in esophageal cancer patients: (a) lymph node metastasis (OR = 1.691, 95% CIs: 1.165~2.455, P = 0.006); (b) invasion (OR = 1.939, 95% CIs: 1.328-2.830, P = 0.001); (c) apoptosis index (OR = 0.131, 95% CIs: 0.064-0.269, P < 0.05).
