Significance of KAI1 protein expression in tissues of papillary thyroid cancer and follicular thyroid cancer

Abstract

Objective To investigate the expression of KAI1 protein in tissues of papillary thyroid cancer (PTC) and follicular thyroid cancer,and the effect of KAI1 protein in invasion and metastasis of PTC.Methods The clinical data of 58 patients with PTC (PTC group),17 patients with follicular thyroid cancer (follicular cancer group) and 30 patients with benign thyroid tumor (control group) were retrospectively analyzed from January 2006 to August 2009.The expression of KAI1 protein in PTC tissues,follicular thyroid cancer tissues and benign thyroid tumor tiasues were detected by immunohistochemistry method.Results The positive expression rate of KAI1 protein in PTC group was 48.3％(28/58),in follicular cancer group was 47.1％(8/17),in control group was 86.7 ％(26/30).There was significant difference between PTC group,follicular cancer group and control group (P＜ 0.01).There was no significant difference between PTC group and follicular cancer group (P ＞ 0.05).There was no significant difference in the positive expression rate of KAI1 protein of PTC tissues among the different sex,age and size of the primary lesion (P＞ 0.05).The positive expression rate of KAI1 protein in the TNM Ⅰ was 88.9％(8/9),the TNM Ⅱ was 60.9％(14/23)and the TNM Ⅲ-Ⅳ was 23.1％ (6/26),there was significant difference in the positive expression rate of KAI1 protein among the different TNM stage (P ＜ 0.01).The positive expression rate of KAI1 protein in the lymph node metastasis patients was 32.3％ (10/31),the non-lymph node metastasis patients was 66.7％ (18/27),there was significant difference (P ＜ 0.05).Conclusion The expression of KAI1 protein may reflect the PTC metastasis and the clinical evolution of tumors,the KAI1 protein may inhibit the invasion and metastasis of PTC. Key words: Thyroid neoplasms; Kangai-1 protein; Immunohistochemistry