Specimen adequacy

was determined with on-site cytologic examination performed with a “”touch prep”" technique. Of 1910 liver biopsies, 240 (12.6%) revealed focal lesions, and cytologic and pathologic examination results were available for 208 (86.7%) of these 240 lesions. The number of biopsy passes and concordance between cytologic and pathologic findings were evaluated, and correlation between lesion size, type, and location and the number of passes was assessed. The Pearson correlation Selleckchem CDK inhibitor chi(2) test and the Wilcoxon test were used.

Results: Biopsy specimens were diagnostic in 205 cases (98.6%) and were nondiagnostic in three cases (1.4%); 85.9% of the lesions were malignant. There was a single lesion in 89 patients (42.8%), and there were multiple lesions in 119 patients (57.2%). One biopsy pass was sufficient in 58 patients (27.9%); two passes were sufficient in 75 patients (36.1%); and three, four, five, and six passes were sufficient in 51 (24.5%), 17 (8.2%), five (2.4%), and two (1.0%) patients, respectively. There was no relationship between lesion size or

location and the number of passes, according to the Pearson correlation and chi(2) test (P = .16 and P = .22, respectively). On average, 1.9 passes were required for metastatic lesions, versus LOXO-101 PX-478 clinical trial 2.8 for nonmetastatic lesions (P < .001, Wilcoxon test). Cytologic and histopathologic findings were discordant in 25 cases (12.0%).

Conclusion: The size and location of liver lesions sampled for biopsy do not influence the number of passes needed, while metastatic lesions require fewer passes. Without the on-site cytologic examination service, a predetermined number of three

passes would be diagnostic in almost 90% of all cases. (C) RSNA, 2008″
“Transgenic animals are used extensively in the study of in vivo gene function, as models for human diseases and in the production of biopharmaceuticals. The technology behind obtaining these animals involves molecular biology techniques, cell culture and embryo manipulation; the mouse is the species most widely used as an experimental model. In scientific research, diverse models are available as tools for the elucidation of gene function, such as transgenic animals, knockout and conditional knockout animals, knock-in animals, humanized animals, and knockdown animals. We examined the evolution of the science for the development of these animals, as well as the techniques currently used in obtaining these animal models. We review the phenotypic techniques used for elucidation of alterations caused by genetic modification.