CGA and benign neoplasm: The study showed that the differences in lymph node metastasis rate were statistically significance in age (p < 0.001), tumour size (p < 0.001), tumour location (p < 0.001), lymphovascular invasion (p < 0.001), muscularis propria invasion (p < 0.001), Ki 67 index (p < 0.001) and CgA (p < 0.001).