KLK3 and digestive system cancer: Among these 19 patients (17.9%) presented as squamous cell carcinoma of the cervical lymph nodes, 4 patients presented as poorly differentiated carcinoma with neuroendocrine characteristics proven by immunohistochemistry, 6 patients with adenocarcinoma with colon-cancer profile and 2 male patients with blastic bone metastases and elevated prostate-specific antigen.