E-cadherin expression in lymph nodes of three patients with non-Hodgkin's lymphoma

The E-cadherins are a family of cell-cell adhesion molecules. These molecules exhibit Ca2+ dependent cell adhesion and are expressed on epithelial cells. E-cadherin levels in serum are known to be significantly elevated in patients with epithelial carcinomas. We determined serum E-cadherin levels in 30 patients with non-Hodgkin's lymphoma (NHL) using an enzyme immunoassay and then investigated whether E-cadherin is expressed on lymphoma cells in lymph nodes of three cases selected to analyze from 15 cases of serum E-cadherin levels over mean + 2SD with monoclonal antibody immunohistochemistry. Results indicated that E-cadherin antigen is expressed on the lymphoma cells in these three patients with NHL, and that soluble E-cadherin might be released into blood from lymphoma cells. Expression of E-cadherin may contribute to the morphological appearance of some malignant lymphoma, although no conclusion can be drawn based on such small number of patients analyzed.

Urinary trypsin inhibitor levels in the urine of patients with haematological malignancies

The urinary trypsin inhibitor (UTI) levels in the urine of patients with various haematological malignancies were determined, using automated latex agglutination immunoturbidimetry. The mean UTI levels in urine in acute non-lymphocytic leukaemia, myelodysplastic syndrome, non-Hodgkin's lymphoma, and multiple myeloma groups were significantly elevated, compared with the normal control group. It was found that the UTI level in urine changed from an elevated value to a normal value with haematological improvement by chemotherapy in a patient with myelodysplastic syndrome included in a previous study. These results suggest tha

Analysis of IL-18 bioactivity and IL-18 mRNA in three patients with adult T-cell leukaemia, acute mixed lineage leukaemia, and acute lymphocytic leukaemia accompanied with high serum IL-18 levels

Interleukin-18 (IL-18) bioactivity in sera and IL-18 mRNA expression in leukaemia cells of three patients with adult T-cell leukaemia (ATL), acute mixed lineage leukaemia (AMLL) and acute lymphocytic leukaemia (ALL) accompanied with high serum IL-18 levels have been analysed. There was little serum IL-18 bioactivity in the three patients with ATL, AMLL and ALL, while IL-18 mRNA expression was detected in leukaemia cells of all three patients.

Clinical significance of serum E-cadherin levels in patients with haematological malignancies

E-cadherin is a transmembrane glycoprotein that mediates Ca2+-dependent intracellular adhesion in normal epithelial cells. E-cadherin levels in serum are known to be significantly elevated in patients with epithelial carcinomas. However, the role of E-cadherin in haematopoietic cells is less clear. In this study, serum E-cadherin levels were therefore determined in patients with acute or chronic leukaemia, malignant lymphoma or myelodysplastic syndromes. Significant elevation of serum E-cadherin levels was detected in patients with haematological malignancies, and between types of acute leukaemias or subtypes of myelodysplastic syndromes, stages of malignant lymphoma, and phases of chronic leukaemia, respectively, compared with those in healthy adult volunteers. These findings suggest that E-cadherin might be expressed in malignant haematopoietic cells and might be useful as a diagnostic indicator in haematological malignancies.

[Requirements for early discharge after allogeneic bone marrow transplantation]

To assess the requirements for early discharge after allogeneic bone marrow transplantation (BMT), we evaluated infectious complications and transplantation-related toxicity (TRT) among 46 recipients who underwent allogeneic BMT between January 1997 and August 1999 at our institute. Acute graft-versus-host disease (GVHD) and cytomegalovirus (CMV) antigenemia developed in 29 and 26 patients, respectively. More than 95% of the episodes occurred before day 70. Among the patients without CMV antigenemia and without prednisolone (PSL) therapy for acute GVHD (n = 15), only 3 developed TRT or infections (pneumonia, varicella zoster virus infection and hemolytic uremic syndrome), but all of these episodes were cured without fatality. On the other hand, in patients with CMV antigenemia and/or PSL therapy for acute GVHD, a high incidence of TRT and infectious complications was observed until day 180, and some of these episodes were fatal. In conclusion, discharge on day 70 after allogeneic BMT seems to be safe for patients who do not develop CMV antigenemia or receive PSL therapy for acute GVHD.

[CD13- and CD33-negative acute myelocytic leukemia (FAB classification; M2) with morphological changes and CD13 expression on recurrence]

A 42-year-old man was diagnosed as having acute myelocytic leukemia in July 1998. The leukemic cells tended to be differentiated, and on the basis of positive peroxidase staining, this case was considered to be AML (M2) according to the FAB classification. t(8;21)(q22;q22) chromosomal abnormality was observed, but surface antigen analysis revealed no expression of either CD13 or CD33, a finding characteristic of myelocytic leukemia. Combination chemotherapy resulted in complete remission, and allogeneic bone marrow transplantation was performed with donor cells from the patient's sister. Unfortunately, however, the patient died about 18 months after the onset of leukemia. Comparison of the findings at recurrence with those at initial diagnosis revealed morphological changes in non-differentiated immature cells (AML-M1) and CD13 surface antigen expression. This was considered to be a rare case of AML with neither CD13 nor CD33 expression at onset, but with CD13 expression at recurrence.

[Evaluation of polymerase chain reaction method for monitoring of fungal infection in compromised hosts]

Diagnosis of fungal infections in compromised hosts has been difficult because of insufficient sensitivity and specificity of conventional methods such as culturing and serum testing. Therefore, antifungal agents are usually started in febrile patients who are resistant to antibiotics even if these monitoring tests were negative. In this study, therefore, in order to increase the reliability of these monitoring, polymerase chain reaction (PCR) methods for detection of blood fungus were also performed in compromised hosts including 14 patients with hematological malignancies and one with solid tumor who were undergoing chemotherapies. From these patients, total of 56 peripheral blood samples was collected periodically, irrespective of the presence of infectious signs. At each time point of venopuncture, status of the patient was allocated to one of the followings: A, receiving an intravenous antifungal therapy because of sustaining fever which had not responded to prior antibiotic therapies and also positive for culturing and/or serum beta-D-glucan tests; B, receiving an additional intravenous antifungal therapy but negative for culturing and serum-tests; C, febrile but not yet receiving any intravenous fungal therapy; D, afebrile status. During the study, 10 blood samples from 3 patients were allocated in group A, and one sample of them was positive while remaining 9 were all negative for PCR. Six samples from 4 patients were in group B, and one was PCR positive while remaining 5 were negative. Fifteen samples from 7 patients were in group C, and 3 were positive and 12 were negative for PCR. Twenty-five samples were in group D, and 5 were positive and 20 were negative for PCR. Thus, the results from fungal PCR in these patients were in some case showed discrepancies from those expected from the clinical course and/or conventional monitoring tests. Further evaluation of fungal PCR may gain insight into the more precise diagnosis of fungal infection in these patients.