Objective To investigate the relationship between circKIF4A expression and clinicopathologic features and prognosis of thyroid cancer patients.Methods A total of 120 patients diagnosed with thyroid cancer in our hospital from April 2016 to April 2017 were selected by random sampling method.Cancer tissues and adjacent tissues were taken during surgery and divided into thyroid cancer group and adjacent cancer group according to surgical pathologic detection.The relative expression level of circKIF4A in thyroid cancer group and paracancer group was detected by qRT-PCR,and the relationship between circKIF4A expression and clini-copathological features of thyroid cancer was analyzed.Kaplan-Meier survival curve was used to analyze the relationship between circKIF4A expression and prognosis of thyroid cancer patients.Cox regression analysis was performed to analyze the factors influencing the poor prognosis of patients with thyroid cancer 5 years af-ter surgery.Results The relative expression level of circKIF4A in thyroid cancer group was higher than that in paracancer group,and the difference was statistically significant(P＜0.05).The expression of circKIF4A was correlated with the degree of capsule invasion,lymph node metastasis and differentiation(P＜0.05).Kap-lan-Meier survival curve analysis showed that the 5-year cumulative survival rate of patients with high cir-cKIF4A expression was lower than those with low circKIF4A expression,and the difference was statistically significant(x2=11.368,P=0.001).Multivariate analysis showed that envelope invasion,degree of differenti-ation,lymph node metastasis and circKIF4A expression level were the influencing factors for poor prognosis of thyroid cancer patients at 5 years after surgery(P＜0.05).Conclusion circKIF4A is highly expressed in thy-roid cancer tissues,which is related to the clinicopathological features and 5-year postoperative survival of thy-roid cancer patients,and may be used as a potential prognostic marker for thyroid cancer.

Xiaoyaosan， a classical prescription for mental disorder recorded in Formulary of the Bureau of Taiping People's Welfare Pharmacy（《太平惠民合剂局方》）， is composed of Bupleuri Radix， Angelicae Sinensis Radix， Paeoniae Radix Alba， Atractylodis Macrocephalae Rhizoma， Poria， Zingiberis Rhizoma Praeparatum， Menthae Haplocalycis Herba， and Glycyrrhizae Radix Et Rhizoma Praeparata Cum Melle. Clinical practices and experiments have proved that it can be used for primary depression， anxiety， as well as the depression induced by various somatic disorders， such as gynecological diseases， internal diseases， and digestive system diseases， as evidenced the improvement of Hamilton depression rating scale score， self-rating depression scale score， etc. Xiaoyaosan has been verified to be remarkably effective， with high compliance and no obvious adverse reactions in patients. Xiaoyaosan mainly acts on monoamine neurotransmitters 5-hydroxytryptamine （5-HT）， norepinephrine （NE）， and dopamine （DA）， adrenocorticotropic hormone （ACTH） and corticosterone （CORT） in hypothalamic-pituitary-adrenal axis， pro-inflammatory cytokines interleukin-1β （IL-1β）， interleukin-6 （IL-6）， and tumor necrosis factored （TNF）-α， and orexin， ghrelin， and leptin in intestinal microecology and brain-gut axis， to regulate the neurobiochemical mechanism， endocrine mechanism， immune mechanism， and abnormal brain structure， thereby preventing and alleviating depression. However， the antidepressant mechanism of Xiaoyaosan needs to be further discussed. Through literature research， this paper analyzes the clinical application and basic mechanism of Xiaoyaosan in the treatment of depression， which is expected to serve as a reference for the application of this prescription in the clinical prevention and treatment of depression and improvement of the quality of life of patients， and further research on the antidepressant mechanism of Xiaoyaosan.