Expression of dendritic cell phenotypic antigens in cervical lymph nodes of patients with hypopharyngeal and laryngeal carcinoma.

Background: The purpose of this study was to assess the presence of dendritic cell phenotypic antigens in the cervical lymph nodes of patients with hypopharyngeal and laryngeal carcinoma, and to assess the significance of such antigens in the tumour immune reaction. Methods: Immunohistochemical staining of cervical lymph nodes was performed using antibodies against cell surface markers such as S-100 protein and cluster of differentiation 1a and 83 glycoproteins. Two hundred and seventy-four cervical lymph nodes obtained at surgery from 37 patients with hypopharyngeal carcinoma and 31 patients with laryngeal carcinoma were thus evaluated. Results: The number of dendritic cells positive for each phenotypic antigen was significantly greater in non-metastatic lymph nodes than in metastatic lymph nodes. In the metastatic lymph nodes, cluster of differentiation 1a glycoprotein positive dendritic cells were predominantly detected in the cancer ‘nest’, whereas mature dendritic cells staining for cluster of differentiation 83 glycoprotein were prominent in the peritumour area. In the metastatic lymph nodes, in contrast to the cluster of differentiation 1a glycoprotein positive dendritic cells, the degree of infiltration of cluster of differentiation 83 glycoprotein positive dendritic cells was significantly higher in the peritumour area than in the cancer nest. There was a significant difference in survival status, comparing patients with different degrees of dendritic cell infiltration for each type of phenotypic antigen. Conclusions: Dendritic cells may play different roles in tumour immunity against hypopharyngeal and laryngeal carcinoma. The phenotypic antigens of dendritic cells may thus constitute important indices with which to predict the prognosis of patients with hypopharyngeal and laryngeal carcinoma.