Cytological findings of ROS1‐rearranged lung adenocarcinoma

ROS1‐rearranged lung adenocarcinoma has been recently identified. We report a case of ROS1‐rearranged lung adenocarcinoma with special emphasis on cytological findings. Here, we report a case of young woman with ROS1‐rearranged lung adenocarcinoma diagnosed by cytology and discuss the clinical, cytological, and molecular findings. Cytologically, the tumor consisted of small tight clusters of cells with high nuclear/cytoplasmic ratio. Nuclei were enlarged and small nucleoli were occasionally observed. Signet‐ring cells were focally identified. Neoplastic cells were positive for ROS1 immunocytochemistry. Subsequently, the translocation of ROS1 gene was confirmed in a histological specimen. In conclusion, the specific histology of adenocarcinoma on cytological materials should promote testing for ROS1 immunohistochemistry. Immunocytochemical detection of ROS1 protein helps identify patients suitable for molecular targeted therapy.     

螺旋CT血管造影及CT仿真内窥镜技术对主动脉夹层的诊断与评价

目的：探讨螺旋CT血管造影（SCTA）及CT仿真内镜（CTVE）技术对主动脉夹层诊断的临床应用价值。材料与方法；12例主动脉夹层行螺旋CT血管造影及二维和三维重建，二维重建包括多平面重建（MPR）及曲面重建（CRI）。三维重建包括表面遮盖成像（SSD）及最大密度投影（MIP），其中6例行主动脉CTVE成像。结果：SCTA横断面CT，MPR及CRI均显示12例主动脉夹层真腔与假腔，剥离内膜，瘤壁钙化及血栓，械断面CT显示4例内膜破裂口，MPR及CRI显示5例内膜破裂口，SSD及MIR显示12例真腔与假腔及剥离内膜，2例主动脉弓分支血管，SSD及MIP图像直观，立体感强，但均不能显示夹层动脉瘤内部结构情况及内膜破口，CTVE显示5例主动脉夹层真腔与假腔及其内壁，剥离内膜。结论：以主动脉SCTA的横断面CT图像为基础。结论其MPR，CRI，SSD，MIP及CTVE图像是诊断与评价主动脉夹层最有效无创伤性检查方法之一。     

喉癌的CT诊断

目的:进一步提高喉癌CT诊断的正确性。材料和方法:回顾分析了40例经手术病理证实的喉癌的CT表现,声门上癌13例,声门癌20例,贯声门癌7例。结果:CT清晰地显示了喉部深浅结构。包括喉旁间隙,会厌前间隙,及声门下区全貌,亦能准确显示肿瘤的大小,位置、浸润范围.软骨侵犯和颈部转移淋巴结。结论:CT诊断明显提高了喉癌T分期的准确性,为保存喉功能手术的选择提供了重要依据,但研究还表明CT诊断喉癌尚有一定的局限性。     

Evidence for limited exchange of avian influenza viruses between seaducks and dabbling ducks at Alaska Peninsula coastal lagoons

Avian influenza virus (AIV) prevalence and sequence data were analyzed for Steller’s eiders (Polysticta stelleri) to assess the role of this species in transporting virus genes between continents and maintaining a regional viral reservoir with sympatric northern pintails (Anas acuta). AIV prevalence was 0.2% at Izembek Lagoon and 3.9% at Nelson Lagoon for Steller’s eiders and 11.2% for northern pintails at Izembek Lagoon. Phylogenetic analysis of 13 AIVs from Steller’s eiders revealed that 4.9% of genes were of Eurasian origin. Seven subtypes were detected, including two also observed in northern pintails. No AIV strains were highly similar (> 99%) at all gene segments between species; however, highly similar individual genes were detected. The proportion of highly similar genes was greater within rather than between species. Steller’s eiders likely transport AIV genes between continents through long-distance migratory movements. Differences in AIV prevalence, subtype distribution, and the proportion of highly similar genes suggest limited AIV exchange between Steller’s eiders and northern pintails at Alaska Peninsula coastal lagoons during autumn.     

Preclinical PK and PD Studies on 2��-O-Methyl-phosphorothioate RNA Antisense Oligonucleotides in the mdx Mouse Model

Antisense oligonucleotides (AONs) are being developed as RNA therapeutic molecules for Duchenne muscular dystrophy. For oligonucleotides with the 2′-O-methyl-phosphorothioate (2OMePS) RNA chemistry, proof of concept has been obtained in patient-specific muscle cell cultures, the mouse and dog disease models, and recently by local administration in Duchenne patients. To further explore the pharmacokinetic (PK)/pharmacodynamic (PD) properties of this chemical class of oligonucleotides, we performed a series of preclinical studies in mice. The results demonstrate that the levels of oligonucleotides in dystrophin-deficient muscle fibers are much higher than in healthy fibers, leading to higher exon-skipping levels. Oligonucleotide levels and half-life differed for specific muscle groups, with heart muscle showing the lowest levels but longest half-life (~46 days). Intravenous (i.v.), subcutaneous (s.c.), and intraperitoneal (i.p.) delivery methods were directly compared. For each method, exon-skipping and novel dystrophin expression were observed in all muscles, including arrector pili smooth muscle in skin biopsies. After i.v. administration, the oligonucleotide peak levels in plasma, liver, and kidney were higher than after s.c. or i.p. injections. However, as the bioavailability was similar, and the levels of oligonucleotide, exon-skipping, and dystrophin steadily accumulated overtime after s.c. administration, we selected this patient-convenient delivery method for future clinical study protocols.