Purpose To study the clinicopathological features and immunohistochemical characteristics of IgG4-related disease. Meth-ods The microscopic characteristics and immunohistochemical staining (EnVision) of IgG, IgG4, CD138 and CD34 have been per-formed on 12 cases of IgG4-related disease. Results IgG4-related disease were characterized by diffuse fibrosis, accompanied with in-filtrating of dense lymphocytes and plasma cells surrounding neurovascular and occlusive phlebitis. Immunohistochemical staining re-sults showed the ratio of IgG4+/IgG+ cells were over 40%. Conclusions IgG4-related disease is absent of characteristic clinical and radiographic features and is easily misdiagnosed as tumor. Preoperative serum IgG4 detection could be used as the prior examina-tion for the suspected cases.

In view of the problems existing in medical image network teaching, such as redundant and rigid curriculum system, obsolete structure, untimely updates, lack of supervision system and poor stability of network security and so on, we explored how to improve the medical image network teaching from the fusion of traditional teaching, optimizing curriculum system, perfecting the medical imaging system of autonomous learning, encouraging online communication, creating a good atmosphere, increasing invest-ment in software development and multi-sectoral collaboration, in order to complete the transfer of knowl-edge more effectively, and promote the good development of medical imaging teaching.

OBJECTIVE:To explore the genome-wide methylation differences between coronary heart disease (CHD) patients and healthy volunteers,and to investigate the relationsip of DNA methylation with CHD from epigenetics. METHODS:In case-control study,subjects were divided into CHD group(50 cases)and health control group(50 cases). DNA of 2 groups were sequenced with methylated DNA immunoprecipitation sequencing technology. The genome-wide methylation differences were analyzed and compared between 2 groups. RESULTS:The number of methylation peak in CHD group was higher than health group,with statistical signfi-cance(P<0.05). The methylation peak mainly distributed in 5'UTR,Intron functional elements. The number of reads in AQP1,SHB and other gene promoters in CHD group were lower than health group,and its methylation level decreased. The number of reads in GRK5 and serveal gene promoters on chrX in CHD group were higher than helath group,and its methylation level increased,with sta-tistical significance(P<0.01). CONCLUSIONS:The genome-wide methylation level of CHD patients are higher than those of healthy volunteers. The occurence of CHD is possibly associated with the change of methylation level of related gene promoters.

Objective To explore the characteristics of ALK fusion gene in patients with primary lung adenocarcinoma in Gannan region, with hopes of scientifically guiding such patients towards selecting targeted drugs. Methods 5′/3′ imbalance strategy for qRT-PCR was used to detect the expression of ALK fusion gene in 233 cases of primary pulmonary adenocarcinoma and the clinical pathological characteristics were analyzed. Results The expression rate of ALK fusion genes was 9.01% (21/233). The expression rate of ALK fusion gene in female and N1-3 patients was significantly higher than that in male and N0 patients (P < 0.05); The expression rate of ALK fusion gene in patients with no smoking history, age < 55 years, M1 stage and fresh biopsy specimens was relatively high (P > 0.05); The expression of ALK fusion gene was not correlated with TNM stage, T stage, surgical treatment or tumor distribution location (P > 0.05). Moreover, in the subgroup analysis of 153 M1-stage cases, no correlation was found between the expression of ALK fusion gene and the metastasis of common sites of lung cancer (bone, brain, opposite lung, pleural dissemination adrenal glands and liver) (P > 0.05). Conclusion The expression rate of ALK fusion gene in primary lung adenocarcinoma in Gannan region is relatively high, which is common in female patients with lymph node metastasis.