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Biomedical subjects

T Sun

Publications and source records attributed to T Sun.

At least 181 records · Page 10Linked to original sources
PubMed1992

Phenotyping and genotyping of composite lymphoma with Ki-1 component.

A case of composite lymphoma consisting of an anaplastic large-cell Ki-1 lymphoma and a small-cell follicular lymphoma was found in the splenic hilar lymph node of a 66-year-old woman. The Ki-1 lymphoma showed monoclonal IgM-lambda and CD 20, CD 74, and CDw 75 antigens by immunostaining and CD 19, CD 20, CD 22, and lambda antigens by flow cytometry. The follicular lymphoma also showed monoclonal IgM-lambda, and CD 20 and CDw 75 antigens but not CD 74 and CD 30 (Ki-1) by immunostaining. Flow cytometric analysis of the follicular lymphoma component was not conclusive, as it was impossible to separate the neoplastic from the normal small B lymphocytes. Ki-1 lymphoma usually is seen in childhood and is mostly of T cell origin. It is, therefore, unusual to find Ki-1 antigen component in a composite lymphoma of B-cell origin in an adult. However, there has been evidence to suggest that B-cell Ki-1 lymphoma may be related to follicular lymphoma. Thus, our case may represent a follicular lymphoma transforming into a Ki-1 lymphoma. Immunogenotyping in this case revealed that the two components were probably of the same clonal origin, as they seemed to share the same light chain gene. The presence of rearrangement in the switch region of the IgH in our case without the actual occurrence of heavy chain switching may have triggered somatic recombination in the IgH complex. This series of events may have led to the transformation of a low-grade lymphoma into a high-grade lymphoma, accounting for the two morphologic patterns seen in our bimorphic lymphoma.

Aged↗
PubMed1991

Extramedullary blast crisis in chronic myelogenous leukemia. Demonstration of T-cell lineage and Philadelphia chromosome in a paraspinal tumor.

A case of chronic myelogenous leukemia (CML) with penetrance of the Ph1 molecular alteration into the T-cell lineage of a paraspinal tumor is reported. The T-cell nature of the paraspinal tumor was documented by immunochemical study and genotyping. The Philadelphia chromosome was also detected by genotyping in the same tumor cell population. To the authors' knowledge, this is the first case of extramedullary T-cell blast crisis in CML demonstrated in an extranodal tumor. The clinical significance of detecting extramedullary blast crisis, and the theories for the scarcity of T-cell transformation in CML are discussed.

Blast Crisis↗
PubMed1991

Mutational hotspot in the p53 gene in human hepatocellular carcinomas.

Human hepatocellular carcinomas (HCC) from patients in Qidong, an area of high incidence in China, in which both hepatitis B virus and aflatoxin B1 are risk factors, were analysed for mutations in p53, a putative tumour-suppressor gene. Eight of the 16 HCC had a point mutation at the third base position of codon 249. The G----T transversion in seven HCC DNA samples and the G----C transversion in the other HCC are consistent with mutations caused by aflatoxin B1 in mutagenesis experiments. No mutations were found in exons 5,6,8 or the remainder of exon 7. These results contrast with p53 mutations previously reported in carcinomas and sarcomas of human lung, colon, oesophagus and breast; these are primarily scattered over four of the five evolutionarily conserved domains, which include codon 249 (refs 4-9). We suggest that the mutant p53 protein may be responsible for a selective clonal expansion of hepatocytes during carcinogenesis.

Base Sequence↗
PubMed1991

CD3+, CD4-, CD8- large granular T-cell lymphoproliferative disorder.

Large granular T-cell lymphoproliferative disorder (LGTLD) is a heterogeneous disorder covering a broad spectrum of diseases and requiring further subdivision. Most reported cases emphasized its suppressor phenotype (T gamma cell or CD8+), but we encountered two cases of CD3+, CD4-, CD8- LGTLD. Both cases had a benign clinical course and required no chemotherapy despite persistent lymphocytosis. This unique phenotype has been reported in a few cases of acute lymphoblastic leukemia expressing the T-cell receptor (TcR) gamma chain gene and is considered the counterpart of thymocytes at the intermediate stage between early precursors and mature thymocytes. Our case 1 provides further evidence that the CD3+, CD4-, CD8- phenotype, indeed, expresses the TcR gamma chain gene. However, the negative reaction to terminal deoxynucleotidyl transferase in our case 1 indicates that this phenotype represents proliferation of peripheral T-cells, in which about 2% bear the CD3+, CD4-, CD8- phenotype in the normal population. The selective use of CD3, CD4, CD8, HNK-1 monoclonal antibodies and of cytochemical stains (acid phosphatase and alpha-naphthyl butyrate esterase) for characterization of this disorder is discussed.

Adult↗
PubMed1991

Diagnostic value of lactate dehydrogenase isoenzymes in cerebrospinal fluid.

To evaluate the diagnostic value of lactate dehydrogenase (LD) isoenzymes in cerebrospinal fluid (CSF), 93 consecutive CSF specimens were analyzed. These specimens were from patients of four categories: tumors, infections, hemorrhages, and others. It was found that the isoenzyme patterns overlapped among different categories, but they differed within each category and were thus helpful in differential diagnosis. For instance, metastatic tumors showed prominent LD-5, whereas a primary brain tumor demonstrated an increase in all fractions. Viral encephalitis revealed an increase in the first three isoenzymes and bacterial meningitis, the last two. In acquired immune deficiency syndrome (AIDS) cases, however, LD isoenzyme changes were demonstrated in CSF when only cryptococcal meningitis and not when encephalitis was present. Both subdural and subarachnoid hemorrhages showed elevation of all fractions in our study. Elevation of the first three fractions was usually due to brain tissue damage or hemorrhage, as proven by our isoenzyme study of hemolysate mixed with CSF. The prominence of the last two fractions was related to anaerobic metabolism in the central nervous system or to granulocytic infiltration. In conclusion, LD isoenzyme analysis in CSF is helpful in differential diagnosis of various CNS disorders, although its sensitivity awaits further improvement.

Adult↗
PubMed1991

Enterobius egg granuloma of the vulva and peritoneum: review of the literature.

Two cases of Enterobius granuloma containing eggs only are reported. The first case involved the vulva, where no such granuloma has been reported previously. The coexistence of peritoneal granuloma and rectal adenocarcinoma in the second case suggests the possibility of direct penetration of the damaged colonic wall by the parasite, as emphasized by several previous reports of neoplastic involvement and perforation of the intestinal wall in cases of ectopic infections. The diagnostic criteria of Enterobius eggs granuloma, which might be a diagnostic dilemma for pathologists who are not familiar with such criteria, are described herein.

Adult↗
PubMed1991

Effects of Cordyceps sinensis on murine T lymphocyte subsets.

It was shown by flow cytometry analysis that crystalized preparation of Cordyceps sinensis (Cs-Cr) caused significant elevation of the number of T helper cells and Lyt-1/Lyt-2 (T helper to T suppressor cell) ratio both in peripheral blood and the treated mice spleen. The spleen weight, phagocyte counts and phagocytic activity were also elevated in the treated group. In addition, Cs-Cr could protect T helper cells from the immunosuppressive effects of prednisolone acetate and cyclophosphamide. These results further substantiate the fact that Cs-Cr is an immunoregulator/biological response modifier of cellular immunity and may be potentially useful in handling immunodeficient or immunosuppressed patients.

Animals↗
PubMed1991

[Clinical application of the ophthalmic high frequency ultrasonic B-scan diagnostic equipment].

800 eyes were examined with the ophthalmic high frequency ultrasonic B-scan diagnostic equipment. The results were confirmed by medication, optical examination, CT, surgical operation, or pathology at a rate of 93.3%. The authors discussed the acoustic characteristics of the ultrasonic image of common ocular diseases and its functional characteristics. It was believed that the equipment markedly enhanced the diagnostic capability of ultrasound in ophthalmology.

Adolescent↗
PubMed1991

Hand-mirror variant of microgranular acute promyelocytic leukemia.

We report a case of microgranular acute promyelocytic leukemia (APL, M3 V) presenting with the typical features of disseminated intravascular coagulopathy and cells with irregular, folded, or bilobed nuclei with occasional intracytoplasmic multiple Auer rods in the peripheral blood. A cytogenetic study of the bone marrow and blood showed translocation between chromosomes 15 and 17, characteristic of APL. The flow cytometric study also confirmed this diagnosis. The unusual feature in this case is the existence of 80% hand-mirror cells, which also contain multiple Auer rods, in the bone marrow. The hand-mirror variant of acute leukemia has been frequently encountered in acute lymphoblastic leukemia, but documented in only six cases of acute myelogenous leukemia, including the FAB groups of M1, M2, M4, and M5. This patient is, to our knowledge, the first reported case of a hand-mirror variant in microgranular APL. The mechanism of hand-mirror cell formation and its prognostic implication are discussed.

Bone Marrow↗
PubMed1990

Extranodal T-cell lymphoma mimicking malignant histiocytosis.

We report a case of extranodal T-cell lymphoma with fever, hepatosplenomegaly, pancytopenia, and diffuse sinusoidal infiltration of the spleen, liver, and bone marrow by the tumor cells, mimicking malignant histiocytosis. This is the second case of T-gamma (T-cell suppressor) lymphoma resembling the case reported by Kadin et al. [N Engl J Med 304:648, 1981]. The lack of lymph node involvement in this case supports the theory that this type of lymphoma arises in the spleen. This paper draws attention to the extranodal T-cell lymphoma groups that mimic malignant histiocytosis and the need of immunophenotyping for a correct diagnosis. The causes for the absence of T-cell receptor gene rearrangement in T-cell tumors are discussed.

Adult↗
PubMed1990

The clonal origin of two cell populations in Richter's syndrome.

A case of Richter's syndrome was studied by morphology, immunohistochemistry, flow cytometry, and immunoglobulin gene rearrangement. Flow cytometric study clearly demonstrated two monoclonal populations. The use of double staining with CD 5/CD 19 antibodies accompanied by two-color flow cytometric analysis clearly defined the chronic lymphocytic leukemia population and separated it from the lymphoma population. Immunoglobulin heavy-chain gene analysis of blood and lymph node specimens revealed nonidentical as well as identical nongermline bands in these two populations. However, light-chain gene analysis demonstrated that both populations shared a common clonal origin. This result underscores the unreliability of using heavy chain genotype alone to identify clonal origin. Since post-rearrangement deletion, point mutation, and heavy chain switching occur in heavy chain genes, but are seldom seen in light chain genes, it is important to analyze both heavy and light chain genes to conclusively determine clonal origin.

Antigens, CD↗
PubMed1990

[Dot-ELISA in the diagnosis of neurocysticercosis].

The dot-enzyme-linked immunosorbent assay was used to detect Cysticercus cellulosae antibodies in sera of patients with neurocysticercosis. Among 108 confirmed cases of neurocysticercosis 81.6-96.1% showed positive reactions. Two out of 54 normal control sera reacted at a serum dilution of 1:20, but none at a 1:40 (range 40-640). No cross reactions were observed with sera from cases of paragonimiasis and clonorchiasis, but it did occur to some extent with sera from cases of echinococcosis and cerebrovascular diseases. The results indicated that the dot-ELISA was sensitive, specific and economic for the diagnosis of neurocysticercosis.

Animals↗
PubMed1989

Comparison of phenotyping and genotyping of lymphoid neoplasms.

Comparison of phenotyping (PT) and genotyping (GT) of lymphoid neoplasms was performed on 51 specimens including lymph nodes, bone marrows, and body fluids. PT was performed with a flow cytometer using a large monoclonal antibody panel. GT included the testing for gene rearrangements of heavy chain, kappa and lambda light chains, and T-cell receptor beta-chain genes with DNA probes. The results obtained from these two techniques were generally compatible in terms of clonality and cell lineage. Only one case of B-cell lymphoma was not diagnosed by PT but showed gene rearrangement. For T-cell lymphoma, GT offers a more definitive diagnosis than does PT. Biclonality was demonstrated in one case of hairy cell leukemia by GT only. The rearranged band also offers a definitive clonal identification based on electrophoretic mobility. GT can detect a monoclonal population as small as 5% and can be performed on old or fresh specimens. PT requires 20% abnormal cells and a fresh specimen. It is concluded that GT is superior to PT for lymphoid tumor diagnosis, but it should be reserved as a supplementary test at this stage because of its technical complexity.

Antibodies, Monoclonal↗
PubMed1989

Improved immunohistochemical detection of prostatic acid phosphatase by a monoclonal antibody.

A monoclonal antibody with high affinity to acid phosphatase isoenzyme 2 (Ab-AcP2) was selected to examine its binding to different normal and tumor tissues using the indirect immunohistochemical method. Both mature prostatic epithelial cells in the prostate and the highly dedifferentiated prostatic cancer cells in the bone marrow showed strong binding to the antibody. Among nonprostatic tissues, only bone marrow, breast, and kidney showed trace staining in some specimens. The specificity of Ab-AcP2 was much better than that of the polyclonal antibody to acid phospatase previously reported. When the antibody to the prostate-specific antigen (Ab-PSA) was used, weak background staining was often encountered, and weak to moderate stains were seen in the prostatic stroma, bone marrow, lung, skin, and melanoma.

Acid Phosphatase↗