Complications of anterior approach to the cervical spine ara encountered during exposure,spinal procedure, interbody fusion and the postoperative period. 200 cases of such operative procedure observed by the authors are analyzed, and they are divided into following two types:1.Operative injuries: Include the following:(1)Recurrent laryngeal nerve palsy;(2) Homer's syndrome; (3) spinal cord and nerve root injury; (4) cere-brospinal fluid fistula; (5) sleepinduced apnea, and others.2. Postoperative complications include: (1) postoperative hematoma; (2) failure of bony fusion, nonunion and anterior angulation deformity; (3) laryngo-spasm; (4) infection of the operative wound; (5) persistent pain of the iliac donor site.It is the opinion of the authors that the anterior approach to the cervical spine invites less serious complications than the posterior approach, and It should be employed more extensively for degenerative and traumatic disorders of the cervical spine.

The transferrrin(Tf)and the transferrin receptor(TfR)are effective anti tumor agents which exist widely in human body .The Tf takes an important role in iron metabolism ,while the TfR disturbs iron metab-olism and controls the iron absorbing .The compound of Tf and TfR can induce tumor cells apoptosis .Therefore , the combination of Tf and TfR can inhibit tumor growth efficiently .In addition,it is also good for anti tumor indi-rectly by taking Tf/TfR as target and using artemisinin .This article will review and summarize the anti tumor effect of transferrin and transferrin receptor .

Objective: To prepare an inactivated hepatitis A vaccine using a attenuated strain of hepatitis A virus (HAV) H2 and to analyze its immunizing dose, so as to provide the reference for development and production of inactivated hepatitis A vaccines. Methods: Human embryonic lung diploid cells (KMB17) were infected with attenuated HAV H2 strain to proliferate the virus, then the cells containing viruses were harvested, extracted and purified. The obtained virus concentrate was prepared into vaccine bulk and test vaccines with 1 280 EU/mL antigen content. Vaccine testing was carried out according to the inactivated hepatitis A vaccine standards specified in the Part Ⅲ of the Pharmacopoeia of the People's Republic of China (2020 edition). A total of 110 mice were randomly divided into 11 groups, including 5 dose groups (80, 160, 320, 640 and 1 280 EU/dose) of the test vaccine and the reference vaccine, as well as the adjuvant control group. Mice were immunized twice by intraperitoneal injection, their serum HAV antibodies were detected, and the geometric mean titer (GMT) and positive conversion rate of antibodies were analyzed to evaluate the immunising dose of the vaccine. Results: The antigen content and viral titer of the virus harvest solution were 5 120 EU/mL and 8.33 lgCCID50/mL, respectively. The removal rate of foreign protein reached 98.05% and the recovery rate of antigen was 66.25%. The test vaccine met the requirements of Part Ⅲ of the Pharmacopoeia of the People's Republic of China (2020 edition). The GMTs of HAV antibodies in the test vaccine and the reference vaccine dose groups after the second immunization were more than twice higher than those after the first immunization. Regardless of primary immunization or secondary immunization, the GMTs (log2) of HAV antibodies in the test vaccine groups with doses of 160 EU/dose and above were higher than those in the 80 EU/dose group (all P<0.05), while there was no statistically significant differences between the dose groups of 160 EU/dose and above (all P>0.05). The antibody positive conversion rate of 160 EU/dose and above of the test vaccine was 100.00% after the secondary immunization. Conclusions The inactivated hepatitis A vaccine of attenuated H2 strain tested in this study demonstrates strong immunogenicity in mice, suggesting its potential as a candidate vaccine. The preliminary analysis indicates an immunizing dose of 320 EU/dose for children and 640 EU/dose for adults.