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W N Rezuke

Publications and source records attributed to W N Rezuke.

At least 19 recordsLinked to original sources
PubMed2001

Laboratory, morphologic, and immunophenotypic correlates of surface immunoglobulin heavy chain isotype expression in B-cell chronic lymphocytic leukemia.

We compared surface immunoglobulin heavy chain isotype expression with a number of laboratory, morphologic, and immunophenotypic features in a series of 76 cases of B-cell chronic lymphocytic leukemia (B-CLL). Fifty-five cases were IgM+/IgD+, a phenotype associated with antigenically naïve B cells; 16 cases expressed IgD without IgM, a phenotype seen in a subset of normal B cells with extensive somatic immunoglobulin variable region (IgV) gene mutations; and 5 cases were IgD-, a phenotype associated with memory B cells. WBC count, atypical morphologic features, atypical immunophenotypic characteristics, and CD38 expression were nonrandomly distributed among the 3 categories of heavy chain isotype expression. Moreover, a WBC count more than 30,000/microL (30 x 10(9)/L), atypical morphologic features, and CD38 expression in more than 30% of neoplastic cells (all adverse prognostic factors in B-CLL) were less common among IgD-only cases than among IgM+/IgD+ and IgD- cases. These data demonstrate that surface immunoglobulin heavy chain isotype expression is associated with several laboratory, morphologic, and immunophenotypic features in B-CLL. The subset of B-CLL with the IgD-only phenotype is associated with several favorable prognostic factors, suggesting the possibility that IgD-only B-CLL may be associated with a favorable prognosis.

ADP-ribosyl Cyclase↗
PubMed2000

Unusual presentation of a Merkel cell carcinoma.

Merkel cell carcinoma (MCC) is an uncommon, potentially lethal, cutaneous tumor that mainly occurs in sun-exposed skin of the head and neck area of the elderly. We report a case of MCC presenting as a 2-mm crusted erosion on the nose of an elderly patient, the smallest MCC reported thus far in the literature. The optimal management of MCC has not been clearly established. In view of its high local recurrence rate, predilection to metastasis, and significant mortality, aggressive treatment has been advocated. Identification of this tumor at such a small size posed a management dilemma because of lack of prospective treatment data involving biologic markers of prognostic significance for MCC.

Aged↗
PubMed2000

Kaposi's sarcoma following allogeneic hematopoietic stem cell transplantation for chronic myelogenous leukemia.

Unlike solid organ transplantation, Kaposi's sarcoma (KS) occurs rarely following hematopoietic stem cell transplantation (HSCT). In fact, only 5 cases of KS have been reported after allogeneic or autologous HSCT. The usual treatment combines a substantial decrease in, or elimination of, immunosuppressive therapy along with local measures such as surgical excision, cryotherapy or radiation therapy. A 46-year-old woman with chronic myelogenous leukemia who had received an allogeneic HSCT previously from an HLA-identical sibling, presented on day +814 with human herpes virus-8-associated KS involving her left lower extremity. She had been on continuous immunosuppressive therapy since her transplant because of chronic graft-versus-host disease. The intensity of immunosuppressive therapy was decreased once a diagnosis of KS had been established. However, the nodular lesions continued to progress in size and number. Therefore, a course of irradiation was administered to sites of bulk disease on her legs. Furthermore, thalidomide was initiated along with a topical retinoid, alitretinoin 0.1% gel applied twice daily to the nonirradiated lesions. This approach yielded a partial response in both irradiated and nonirradiated lesions over the course of the following 7 months. Both thalidomide and alitretinoin 0.1% gel appear to be beneficial in HSCT-associated KS and exhibit tolerable side effects.

Administration, Oral↗
PubMed2000

Concurrent factor V Leiden and prothrombin G20210A gene mutations in a patient with a history of recurrent thrombosis.

We report a case of a 35-year-old male with a history of recurrent thromboembolic events, who presented to the emergency room with right sided weakness and difficulty with speech. The patient's past medical history included two myocardial infarctions, two deep vein thromboses, and a pulmonary embolism. Subsequent laboratory evaluation indicated that the patient was heterozygous for both the factor V Leiden and prothrombin G20210A mutations. This case report emphasizes the importance of evaluating patients with suspected hereditary thrombophilia for both of these mutations.

Adult↗
PubMed1999

Proliferative fraction, bcl-1 gene translocation, and p53 mutation status as markers in mantle cell lymphoma.

The molecular genetic hallmark of mantle cell lymphomas (MCL) is the reciprocal translocation t(11;14)(q13;q32) which juxtaposes the bcl-1 proto-oncogene to one of the joining segments of the immunoglobulin heavy chain gene. This translocation is very common in MCL and occurs in up to 70% of these malignancies. Due to the aggressive nature of MCL, markers identifying tumor progression and clinical outcomes are necessary. In this study we examined whether a corroborative relation exists between p53 mutations, bcl-1 translocation, and the proliferative fraction in MCL. We evaluated the proliferative fraction, p53 gene status, and bcl-1 translocation in 21 patients with confirmed MCL. Controls consisted of normal DNA and 7 B-cell lymphomas. Immunohistochemical detection of Ki-67 was used to assess proliferative activity while molecular techniques were used to detect p53 mutations and the bcl-1 gene translocation. Reactivity to the monoclonal antibody Ki-67 on neoplastic cells ranged from 5% to 40% in typical MCL cases. The bcl-1 gene translocation was detected by PCR in 48% (10/21) of MCLs while no rearrangements were detected by PCR in case control DNA. Screening exons 5-8 of the p53 gene for mutations did not identify a single mutation in any of the MCL cases. No correlation was found between p53 mutations, the presence of a bcl-1 translocation, and the proliferative activity of neoplastic MCL cells. We conclude that these markers may demonstrate independent events which occur during the pathogenesis of MCL.

Aged↗
PubMed1999

The use of monoclonal antibody R92F6 and polymerase chain reaction to confirm the presence of parvovirus B19 in bone marrow specimens of patients with acquired immunodeficiency syndrome.

BACKGROUND: Parvovirus B19 infection is a cause of chronic anemia and red cell aplasia in patients with acquired immunodeficiency syndrome (AIDS) and in other immunocompromised hosts. Anemia in AIDS patients has a multifactorial etiology, with parvovirus B19 infection being an infrequent but nevertheless treatable cause. Therapy with intravenous immune globulin can result in rapid improvement of parvovirus-induced anemia. This treatment is expensive, therefore accurate and rapid confirmation of parvovirus infection is important in providing appropriate and cost-effective therapy. METHODS: Bone marrow samples from 2 AIDS patients with severe anemia and reticulocytopenia were studied. Bone marrow morphology and serologic studies were evaluated for parvovirus B19 infection. An immunohistochemical method using a monoclonal antibody, R92F6, to B19 capsid proteins was utilized on decalcified, B5-fixed, paraffin-embedded bone marrow biopsies. Bone marrow aspirate cells were examined by electron microscopy for evidence of viral particles. In addition, polymerase chain reaction (PCR) studies using a nested PCR assay to the parvovirus B19 viral genome were performed in a case for which fresh cells were available. RESULTS: Bone marrow findings included marked erythroid hypoplasia with characteristic giant pronormoblasts and intranuclear inclusions. Serologic studies were negative in one case, while the second case showed positive parvovirus B19 immunoglobulin M antibody. Immunohistochemical studies for parvovirus B19 were positive in both cases. The presence of intranuclear virions was demonstrated by electron microscopy and was confirmed by PCR analysis. Both patients were treated with intravenous immune globulin, and subsequent improvement was noted. CONCLUSIONS: Both immunohistochemistry and PCR studies on bone marrow specimens from AIDS patients with anemia are rapid and sensitive methods for the confirmation of parvovirus B19 infection. They are valuable tools, particularly when serologic studies are negative. When PCR is not available, immunohistochemical methods can be useful. The rapid confirmation of parvovirus B19 infection will allow for early and cost-effective therapy.

Acquired Immunodeficiency Syndrome↗
PubMed1998

Rapid multiplex analysis for the factor V Leiden and prothrombin G20210A mutations associated with hereditary thrombophilia.

Thromboembolic episodes are common events and affect approximately one in 1,000 persons annually. Pulmonary embolism alone accounts for 50,000 to 100,000 deaths per year in the United States with > 50% of those being elderly persons. Resistance to activated protein C is the most common inherited disorder associated with hereditary thrombophilia. A missense mutation has been identified in the gene coding for coagulation factor V (codon 506) which renders this procoagulant factor resistant to inactivation by activated protein C resulting in an increased risk for venous thrombosis. Recently, a second polymorphism was identified in the prothrombin gene (factor II) which is also associated with increased risk for venous thrombosis. Because of the high prevalence of these two mutations in the general population as well as in specific patient populations, the ability readily to detect these two mutations must be feasible. In this study, we evaluated 303 patients for the prothrombin mutatin (G20210A) which were previously tested for the factor V mutation using established polymerase chain reaction-mediated restriction fragment length polymorphism assays. In these patients, 30 (9.9%) were found to be heterozygous for the factor V Leiden mutation with no homozygous mutants identified. Twenty individuals (6.6%) were heterozygous for the prothrombin G20210A mutation, and we identified two individuals (0.66%) who were homozygous for the 20210A allele. Of the total 303 individuals screened, two were double heterozygotes for both the factor V Leiden and the prothrombin gene mutations. We also describe a multiplex polymerase chain reaction-mediated restriction fragment length polymorphism assay for detecting both mutations in a single-tube double-enzyme digestion reaction making identification of these two mutations easily achievable.

Factor V↗
PubMed1998

Case report: an autopsy study of a rare T-cell lymphoma clinically misdiagnosed as fulminant hepatic disease.

We describe a case of a 73-year-old male with a rare T-cell lymphoma that presented deceptively as progressive hepatic failure with fever, weight loss, pancytopenia, mental confusion, splenomegaly, and no lymphadenopathy. An alcoholic history supported the diagnosis of cirrhosis, but a liver biopsy was not performed. A bone marrow biopsy was considered unremarkable. Death occurred after a course of four months. Postmortem examination showed hepatic, splenic, lymph node, and marrow infiltration by characteristically sparse, isolated, bizarre, medium-to-large sized neoplastic cells with extensive hepatic centrilobular necrosis, steatosis, and predominant splenic involvement. Immunohistochemical markers indicated a T-cell lymphoma consistent with either an alpha/beta peripheral T-cell lymphoma or a gamma/delta lymphoma. Definitive immunotyping was not available. However, the pathologic features are most consistent with a gamma/delta T-cell lymphoma. This case is an example of a rare, rapidly progressive lymphoma, which is a recognized clinical entity, easily missed, and treatable. Its diagnostic consideration must be explicitly communicated to pathologists, because the isolated or sparse tumor cells in a lymph node, liver, or bone marrow biopsy may easily be mistaken for variants of megakaryocytes or histiocytes.

Aged↗
PubMed1997

Molecular diagnosis of B- and T-cell lymphomas: fundamental principles and clinical applications.

Molecular diagnostic assays have become routine in the evaluation of lymphoid malignancies. Both Southern transfer and polymerase chain reaction (PCR) technologies are used to assess for B- and T-cell clonality, the presence of rearrangements involving protooncogenes such as bcl-1 and bcl-2, and the monitoring of minimal residual disease. We review the fundamentals of B- and T-cell ontogeny as well as the basic principles of the Southern transfer and PCR assays and their applications to the diagnosis of lymphoid malignancies.

Blotting, Southern↗
PubMed1993

An acute form of T gamma lymphoproliferative disease presenting with massive splenomegaly--importance of immunophenotyping for diagnosis.

We describe a case of T gamma lymphoproliferative disease (T gamma LPD) which presented in an uncustomary acute onset in an adult with massive splenomegaly. Morphologically the cells represented monocytic leukemia. Karyotyping and equivocol special stain results suggested hairy cell leukemia. Gene rearrangement indicated a T lymphocytic malignancy. Immunocytochemistry stains were not definitive. Immunophenotyping by flow cytometry defined the cells as consistent with T gamma LPD (CD45+, CD56+, CD2+, CD3+, CD11b+, and CD38+; some cells CD8+; and CD57-). Although the cells did not have spontaneous activity, which is often the situation for most cases of T gamma LPD, the cells could be partially induced with exogenous interleukin 2 to exhibit in vitro cytotoxicity against a natural killer lymphocyte-susceptible target cell line (K562) but not a lymphocyte-activated killer target cell line (HEPG2). This report hopefully continues to increase the awareness of T gamma LPD as well as demonstrates an unusual acute form which could have been misdiagnosed unless a multidisciplinary approach, especially including flow cytometric immunophenotyping, was used to evaluate the patient.

Acute Disease↗
PubMed1991

Arsenic intoxication presenting as a myelodysplastic syndrome: a case report.

A case of arsenic intoxication presenting as a myelodysplastic syndrome is reported. A 41-year-old woman with a 6-month history of gastrointestinal and neurological symptoms was noted to be pancytopenic at presentation. A bone marrow aspirate revealed dysmyelopoietic changes involving all three marrow cell lines. Subsequent analysis of urine for heavy metals demonstrated very high levels of arsenic. Treatment with British anti-Lewisite (BAL) resulted in the resolution of gastrointestinal symptoms and hematological abnormalities although the neurological complications progressed. This case emphasizes that heavy metal intoxication should be considered in the differential diagnosis of any individual presenting with the hematological features of myelodysplasia especially when accompanied by clinical features considered atypical for primary or secondary myelodysplasia.

Adult↗
PubMed1991

Methods in pathology. Identification of T-cell lymphomas in paraffin-embedded tissues using polyclonal anti-CD3 antibody: comparison with frozen section immunophenotyping and genotypic analysis.

While L26 (CD20) is now well established as a B-cell marker of high specificity for use in paraffin-embedded tissues, paraffin-reactive T-cell antibodies (UCHL1, MT1, Leu-22, DF-T1, and MT2) have not shown comparable lineage specificity. A new commercially available polyclonal antibody directed against a synthetic peptide sequence of the CD3 (T-cell) antigen has recently become available for use on paraffin sections. In order to evaluate the utility of this antibody, we studied CD3 expression in conjunction with L26 and leukocyte common antigen (LCA) in 15 T-cell and 20 B-cell non-Hodgkin's lymphomas (NHL), all genotypically confirmed by DNA hybridization and immunophenotyped by immunoperoxidase studies in frozen tissue. Ten of 15 T-cell NHLs (67%) showed unequivocal immunolabeling of neoplastic cells with anti-CD3 in paraffin-embedded tissue. Of the five negative cases, three were lymphoblastic lymphomas, and two were peripheral (postthymic) lymphomas (one anaplastic large cell, Ki-1 positive and one large cell, immunoblastic). CD3 expression was identical in paraffin and cryostat sections (100% concordance). Twenty of 20 B-cell NHLs were positive with L26 and LCA but were negative with anti-CD3. Other neoplasms examined, including three granulocytic sarcomas and 45 nonhematopoietic tumors, were similarly negative with anti-CD3. We conclude that polyclonal anti-CD3 is a sensitive and highly specific T-cell marker in paraffin-embedded tissue and, when used in conjunction with LCA and L26, that it can determine cell lineage in the majority of non-Hodgkin's lymphomas.

Antigens, CD↗
PubMed1989

Cobalt, chromium, and nickel concentrations in body fluids of patients with porous-coated knee or hip prostheses.

Co, Cr, and Ni concentrations were determined by electrothermal atomic absorption spectrophotometry in serum and urine specimens collected from a group of 28 patients at intervals of from 1 day to 2.5 years after total knee or hip arthroplasty with porous-coated prostheses fabricated of Co-Cr alloy (ASTM F-75-82). Two control groups were also tested: (a) 42 healthy adults and (b) 16 orthopaedic patients after total knee or hip arthroplasty with porous-coated prostheses fabricated predominantly of Ti-Al-V alloy (ASTM F-136-84). All prostheses contained polyethylene components to avoid metal-to-metal contact. Mean Co concentrations in serum and urine were slightly increased in patients with Co-Cr knee implants at 6-120 weeks after surgery, compared with (a) preoperative values, (b) corresponding values in patients with Co-Cr hip implants, and (c) corresponding values in control patients with Ti-Al-V knee and hip prostheses. Substantially increased Co levels were observed in serum and urine of two patients at 7 weeks and 22 months postarthroplasty, associated with loosening of the prostheses; one of the patients also had elevated Cr levels in serum and urine. Although ASTM F-75-82 and F-136-84 alloys contain very little Ni (less than 1.0 and less than 0.2% Ni, respectively, by wt), mean Ni concentrations in serum and urine were greatly increased at 1-2 days after implantation of Ti-Al-V and Co-Cr prostheses, diminishing by 2 weeks. The postoperative hypernickelemia and nickeluresis may reflect contamination of the operative field with Ni-containing particles from the drills, cutting jigs, and drilling jigs, or it may represent a previously unrecognized pathophysiological response to surgery.

Adult↗
PubMed1988

Pulmonary histopathology of rats following parenteral injections of nickel chloride.

To elucidate the subacute toxic reactions to parenteral administration of Ni2+, male F-344 rats were given daily injections of NiCl2 (62.5 or 125 mumol/kg, sc) for 3 to 6 weeks. Nickel accumulation was greater in lung than in the other major organs, based upon tissue analyses by electrothermal atomic absorption spectrometry. After 5 or 6 weeks of NiCl2 treatment, severe pathological changes developed in the lungs, including a) prominent hydropic and degenerative changes of the endothelium of pulmonary arteries and veins; b) marked proliferation of alveolar lining cells, affecting Type II (granular)pneumocytes; c) thickening of alveolar walls, with proteinaceous alveolar exudate; d) hyperplasia of bronchial epithelium, with cellular atypia and mitoses; and e) focal bronchial pneumonia with intrabronchial exudates. These pulmonary responses to repeated daily injections of NiCl2 were substantially different from the pathological lesions seen 24 to 72 hours after a single sc injection of NiCl2 (500 or 750 mumol/kg), which included perivascular edema, karyorrhexis and pyknosis of mononuclear cells in focal perivascular infiltrates, and mild pulmonary congestion. This study shows that the lung is a primary site of toxicity in rats following parenteral administration of NiCl2; vascular endothelial cells, Type II pneumocytes, bronchial epithelial cells, and mononuclear cells constitute the principal cellular targets for pulmonary toxicity of Ni2+.

Animals↗
PubMed1987

Reference values for nickel concentrations in human tissues and bile.

Nickel concentrations in human tissues and gallbladder bile were determined by analysis of postmortem specimens from ten consecutive autopsies of adult persons. The tissue samples were collected and homogenized with precautions to avoid nickel contamination and were analyzed by electrothermal atomic absorption spectrophotometry with Zeemann background correction. In decreasing order of mean nickel concentrations, the following results were obtained (mean and range, microgram/kg dry weight, N = 7-10): lung 173 (71-371), thyroid 141 (41-240), adrenal 132 (53-241), kidney 62 (19-171), heart 54 (10-110), liver 50 (11-102), brain 44 (20-65), spleen 37 (9-95), and pancreas 34 (7-71). In five specimens of gallbladder bile, nickel concentrations averaged 2.3 +/- 0.8 micrograms/l (range 1.5-3.3). These data furnish reference values for use in evaluating tissue nickel concentrations in persons with occupational exposures to nickel, provide the first demonstration that nickel concentrations in thyroid and adrenal glands are approximately equal to those in lung and are higher than in other organs, and suggest that biliary excretion may be a significant route for the elimination of nickel in humans.

Adult↗
PubMed1987

Increased nickel concentrations in body fluids of patients with chronic alcoholism during disulfiram therapy.

Nickel concentrations were measured by electrothermal atomic absorption spectrophotometry in body fluids of 61 patients with chronic alcoholism during disulfiram treatment (tetraethylthiuram disulfide, 250 mg/day, po). Nickel concentrations in serum, whole blood, and urine were significantly increased at 12 hours after the initial dose of disulfiram. In serum and whole blood, the Ni concentrations reached a plateau after two weeks of treatment; in urine, the Ni concentrations increased progressively during the initial four months of treatment. During the interval from four months to three years of disulfiram treatment, the median concentrations of nickel in serum, whole blood, and urine were elevated 17-, 15-, and 39-fold, respectively, compared to pretreatment values. The effects of disulfiram on nickel metabolism evidently involve chelation of dietary nickel by diethyldithiocarbamate (DDC), a disulfiram metabolite, and gastrointestinal absorption of the Ni-DDC complex. Since animal studies have demonstrated cerebral uptake of the lipophilic Ni-DDC complex, nickel may possibly accumulate in brain cells of disulfiram-treated patients; physicians should therefore be cautious in administering disulfiram to persons with nickel-containing orthopedic prostheses or occupational exposures to nickel.

Adult↗
PubMed1987

Acute thymic involution and increased lipoperoxides in thymus of nickel chloride-treated rats.

Acute thymic involution occurred in male, Fischer-344 rats following a single injection of nickel chloride (0.5 mmol/kg, sc). In nickel-treated rats, the mean thymic weight became significantly decreased at 24 h, continued to diminish at 48 h, and reached 24% of the control value at 72 h post-injection. The ratio of thymic weight to body weight (mg/g) decreased from 1.24 +/- 0.05 (SD) in control rats to 0.30 +/- 0.05 in nickel-treated rats at 72 h post-injection (p less than 0.01). Concentrations of thymic lipoperoxides were assayed by the thiobarbituric acid reaction, with HPLC separation and spectrophotometric quantitation of the malondialdehyde-thiobarbituric acid complex. The mean concentration of thymic lipoperoxides was unchanged at 24 h, increased 2-fold at 48 h, and reached 8-times the control value at 72 h after nickel chloride injection. On histological examination, sections of thymus from nickel-treated rats showed moderate to profound depletion of cortical lymphocytes at 72 h post-injection. Marked degenerative changes were noted in cortical lymphocytes, with pyknosis and karyorrhexis; swelling and vacuolation were evident in thymic reticular epithelial cells. The time-courses of the biochemical and histopathological responses suggest that the lipid peroxidation may be an end-result, rather than a cause, of thymic involution and injury to thymic lymphocytes in nickel-treated rats.

Animals↗