CD10蛋白在结直肠癌组织中的表达及其临床意义

目的：研究CD10蛋白在结直肠癌组织中的表达及其与结直肠癌的各临床病理指标之间的关系，探讨其在结直肠癌发生、发展中的作用。方法：收集78例结直肠癌组织标本及22例癌旁正常组织样本，运用免疫组化EliVision法检测CD10蛋白的表达，并采用卡方检验分析其表达强度及分布比例与结直肠癌临床病理指标的关系。结果：CD10蛋白在结直肠癌组织和正常结肠黏膜组织中的阳性表达率分别为46.2%（36/78）和0，差异有统计学意义（P < 0.01）。结直肠癌组织中CD10蛋白表达比例与各临床病理指标均无明显相关（P > 0.05）。结直肠癌组织中CD10蛋白表达强度与患者性别、年龄、肿瘤部位、分化程度、浸润深度无明显相关（P > 0.05），而与肿瘤的临床分期、有无脉管侵犯及淋巴结转移有关（P < 0.05），中晚期结直肠癌CD10蛋白表达强度高于早期肿瘤（P=0.033），周围淋巴结转移阳性的结直肠癌CD10蛋白表达强度高于淋巴结阴性病例（P=0.023），存在脉管受侵犯的结直肠癌CD10蛋白表达强度高于无脉管受侵病例（P=0.004）。结论：CD10蛋白在结直肠癌组织中呈高表达，且表达强度与肿瘤的临床分期、有无脉管侵犯及淋巴结转移有关，可能有促进结直肠癌发展和浸润转移的作用。     

Prognostic and clinicopathological utility of programmed death-ligand 1 in malignant pleural mesothelioma: A meta-analysis

ObjectiveProgrammed death ligand 1 (PD-L1) has been reported to be connected to prognosis in individuals with malignant pleural mesothelioma (MPM), although there is no consensus based on data from previous studies. Accordingly, this quantitative meta-analysis investigated prognostic and clinicopathological utility of PD-L1 in patients with MPM.MethodsA comprehensive search of the PubMed, Web of Science, Embase, and Cochrane Library databases for articles published up to October 4, 2019 was performed. Studies using immunohistochemical techniques to detect/quantify the expression of PD-L1 in MPM tissue were enrolled in the analysis. The combined hazard ratio (HR) and corresponding 95% confidence interval (CI) was applied to assess the association between PD-L1 expression and overall survival (OS).ResultsA total of 11 studies comprising 1606 patients was included in the present meta-analysis. For OS, pooled data revealed an HR of 1.50 (95% CI 1.32–1.70; p < 0.001), suggesting that patients with PD-L1 overexpression experience inferior OS. Subgroup analysis revealed that elevated PD-L1 remained a significant prognostic indicator for worse OS, irrespective of sample size, cut-off value, ethnicity, and Newcastle-Ottawa Scale score. Moreover, PD-L1 overexpression was associated with non-epithelioid histology (odds ratio 4.30 [95% CI 1.89–9.74]; p < 0.001).ConclusionsResults of this meta-analysis show that elevated expression of PD-L1 could be a factor predicting poorer survival in patients with MPM.     

Optimization of immunohistochemical detection of collagen type II in osteochondral sections by comparing decalcification and antigen retrieval agent combinations

Bone containing tissues such as osteochondral joint are resistant to routine tissue processing, therefore require decalcification. This technique causes removal of mineral salts, but in the process may macerate the organic tissue, hence the need for tissue fixation. Such severe processing demands careful antigen retrieval to necessitate optimal staining. The aim of our study was to compare five different antigen retrieval protocols (heat retrieval and protein digestion) following decalcification of rabbit knee joints using two different techniques (20% formic acid and 10% ethylenediamine-tetra acetic acid: EDTA). Osteochondral sections were compared based on time required for decalcification, ease of sectioning, morphological integrity using HE staining and antigen preservation (Collagen type II) using immunohistochemistry. The two decalcification solutions did not impair the tissue morphology and ease of sectioning. Joints processed with formic acid decalcified four times faster than EDTA. Among the five antigen retrieval approaches, maximal collagen II uptake with minimal nonspecific staining was found with protein digestion (pronase and hyaluronidase) in both formic acid and EDTA sections. For osteo-chondral sections, we recommend using 10% EDTA for decalcification and pronase plus hyaluronidase for antigen retrieval if maintaining tissue morphology is crucial, whereas if time is of the essence, 20% FA with pronase plus hyaluronidase is the faster option while still preserving structural integrity. Clin. Anat. 33:343–349, 2020. © 2019 Wiley Periodicals, Inc.