Testicular cellular fibroma: a clinicopathological observation / 中华男科学杂志

<p><b>OBJECTIVE</b>To investigate the clinicopathological characteristics, differential diagnosis and prognosis of testicular cellular fibroma.</p><p><b>METHODS</b>We comprehensively analyzed the clinical presentation, histomorphology and immunohistochemistry of a case of testicular cellular fibroma, reviewed the relevant literature, and discussed its pathological features and differential diagnosis.</p><p><b>RESULTS</b>A 30-year-old man presented with complaint of discomfort and painless enlargement in the right testis. The tumor was found to be a testicular fibroma characterized by a solid, thickly or thinly encapsulated, circumscribed and gray-white mass. Microscopically, fusiform cells were arranged into a storiform and herringbone pattern or fascicles. The tumor exhibited a great deal of cellularity and no nuclear polymorphisms, with a mitotic rate of 0-1/10 HP. Immunohistochemistry showed that the tumor cells were positive for Vimentin, patchily positive for S-100 and SMA, but negative for Desmin, alpha-inhibin, CD34 and CD99. The positive rate of Ki-67 was less than 1%.</p><p><b>CONCLUSION</b>Testicular cellular fibroma is a rare testicular sex cord stromal tumor, pathologically resembling its ovarian counterpart. It can be distinguished from other testicular spindle cell tumors by morphology and immunohistochemical staining. For the treatment of testicular cellular fibroma, surgical resection often has a good prognosis.</p>

Construction and identification of a recombinant lentivirus harboring small interfering RNA targeting mouse CD99 antigen-like 2 gene / 南方医科大学学报

<p><b>OBJECTIVE</b>To construct a recombinant lentivirus harboring RNA interference sequence targeting mouse CD99 antigen-like 2 (mCD99L2) gene and observe its infection efficiency of 293FT cells.</p><p><b>METHODS</b>Four pairs of small interfering RNAs (siRNAs) targeting mCD99L2 cDNA were designed, synthesized and linked to the lentivirus vector SD1259 to construct the lentivirus shuttle plasmids. After sequencing, the 4 lentivirus shuttle plasmids were transfected into 293FT cells in the presence of packaging plasmids. Forty-eight hours later, the supernatant was collected and the titer and infection efficiency of the recombinant lentivirus were determined according to the expression of the reporter gene enhanced green fluorescent protein (EGFP) under fluorescent microscope.</p><p><b>RESULTS</b>DNA sequencing demonstrated that mCD99L2 siRNAs were successfully cloned to the lentiviral vector SD1259. The titer of concentrated virus was 1x10(7)/ml in the supernatant of the infected cells.</p><p><b>CONCLUSION</b>The recombinant lentivirus containing siRNA targeting mCD99L2 gene has been successfully constructed, which provide the basis for future establishment of visualized cell model and animal model of Hodgkin's lymphoma.</p>

Nuclear microarray combined with fluorescence in situ hybridization for detecting ALK gene translocation in paraffin-embedded anaplastic large cell lymphoma and its significance / 南方医科大学学报

<p><b>OBJECTIVE</b>To compare the efficacy of nuclear microarray combined with fluorescence in situ hybridization (FISH) and immunohistochemistry in detecting ALK gene translocation and ALK fusion protein in anaplastic large cell lymphoma (ALCL).</p><p><b>METHODS</b>ALK gene translocation and ALK fusion protein in 17 paraffin-embedded ALCL specimens were detected using nuclear microarray combined with FISH and immunohistochemical straining, respectively.</p><p><b>RESULTS</b>The expression of ALK fusion protein was detected immunohistochemically with ALK antibody in 8 of the 17 specimens of systemic ALCL, including 4 with both nuclear and cytoplasmic positivity and 4 with only cytoplasmic positivity. Dual-color FISH identified 6 positive specimens, including the 4 specimens with both nuclear and cytoplasmic positivity as identified immunohistochemically, and 2 with immunohistochemical cytoplasmic positivity. FISH yielded negative results for the 2 specimens with immunohistochemical cytoplasmic positivity.</p><p><b>CONCLUSION</b>Nuclear microarray combined with FISH eliminated the cytoplasmic interference of the results of conventional FISH and provides a high-throughput platform for clinical detection with greater specificity than immunohistochemistry.</p>