ERBB2 and metastatic malignant neoplasm in the lymph nodes: In addition, a significant correlation was not found at TNM stage (OR = 1.27, 95% CI = 0.56‒2.87, P=0.57, random-effects model), tumor size (OR = 0.95, 95% CI = 0.69–1.31, P=0.75, fixed-effects model), distant metastasis (OR = 1.17, 95% CI = 0.27– 5.15, P=0.83, random-effects model), lymph node metastasis (OR = 0.86, 95% CI = 0.41– 1.82, P=0.7, random-effects model), histological grade (OR = 0.90, 95% CI = 0.47–1.71, P=0.74, random-effects model), and HER2 status (OR = 1.10, 95% CI = 0.81–1.48, P=0.56, fixed-effects model).