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1.
Acta Clin Belg ; 77(2): 368-376, 2022 Apr.
Article in English | MEDLINE | ID: mdl-33586631

ABSTRACT

INTRODUCTION: We present the results of the COVID-19 rule-out protocol at Ghent University Hospital, a step-wise testing approach which included repeat NFS SARS-CoV-2 rRT-PCR, respiratory multiplex RT-PCR, low-dose chest CT and bronchoscopy with BAL to confirm or rule-out SARS-CoV-2 infection in patients admitted with symptoms suggestive of COVID-19. RESULTS: Between 19 March 2020 and 30 April 2020, 455 non-critically ill patients with symptoms suspect for COVID-19 were admitted. The initial NFS for SARS-CoV-2 rRT-PCR yielded 66.9%, the second NFS 25.4% and bronchoscopy with BAL 5.9% of total COVID-19 diagnoses. In the BAL fluid, other respiratory pathogens were detected in 65% (13/20) of the COVID-19 negative patients and only in 1/7 COVID-19 positive patients. Retrospective antibody testing at the time around BAL sampling showed a positive IgA or IgG in 42.9 % of the COVID-19 positive and 10.5% of the COVID-19 negative group. Follow-up serology showed 100% COVID-19 positivity in the COVID-19 positive group and 100% IgG negativity in the COVID-19 negative group. CONCLUSION: In our experience, bronchoscopy with BAL can have an added value to rule-in or rule-out COVID-19 in patients with clinical and radiographical high-likelihood of COVID-19 and repeated negative NFS testing. Furthermore, culture and respiratory multiplex PCR on BAL fluid can aid to identify alternative microbial etiological agents in this group. Retrospective analysis of antibody development in this selected group of patients suggests that the implementation of serological assays in the routine testing protocol will decrease the need for invasive procedures like bronchoscopy.


Subject(s)
COVID-19 , Bronchoscopy , COVID-19/diagnosis , Humans , Retrospective Studies , SARS-CoV-2 , Tomography, X-Ray Computed
2.
Cytotherapy ; 20(9): 1164-1181, 2018 09.
Article in English | MEDLINE | ID: mdl-30122654

ABSTRACT

BACKGROUND: Many efforts have been devoted to improve the performance of dendritic cell (DC)-based cancer vaccines. Ideally, a DC vaccine should induce robust type 1-polarized T-cell responses and efficiently expand antigen (Ag)-specific cytotoxic T-cells, while being applicable regardless of patient human leukocyte antigen (HLA) type. Production time should be short, while maximally being good manufacturing practice (GMP)-compliant. We developed a method that caters to all of these demands and demonstrated the superiority of the resulting product compared with DCs generated using a well-established "classical" protocol. METHODS: Immunomagnetically purified monocytes were cultured in a closed system for 3 days in GMP-compliant serum-free medium and cytokines, and matured for 24 h using monophosphoryl lipid A (MPLA)+ interferon-gamma (IFN-γ). Mature DCs were electroporated with messenger RNA (mRNA) encoding full-length antigen and cryopreserved. "Classical" DCs were cultured for 8 days in flasks, with one round of medium and cytokine supplementation, and matured with tumor necrosis factor alpha (TNF-α) + prostaglandin E2 (PGE2) during the last 2 days. RESULTS: Four-day MPLA/IFN-γ-matured DCs were superior to 8-day TNF-α/PGE2-matured DCs in terms of yield, co-stimulatory/co-inhibitory molecule expression, resilience to electroporation and cryopreservation and type 1-polarizing cytokine and chemokine release after cell thawing. Electroporated and cryopreserved DCs according to our protocol efficiently present epitopes from tumor antigen-encoding mRNA, inducing a strong expansion of antigen-specific CD8+ T-cells with full cytolytic capacity. CONCLUSION: We demonstrate using a GMP-compliant culture protocol the feasibility of generating high yields of mature DCs in a short time, with a superior immunogenic profile compared with 8-day TNF-α/PGE2-matured DCs, and capable of inducing vigorous cytotoxic T-cell responses to antigen from electroporated mRNA. This method is now being applied in our clinical trial program.


Subject(s)
Cancer Vaccines , Cell Culture Techniques/methods , Dendritic Cells/cytology , RNA, Messenger , Antigens, Neoplasm/genetics , Antigens, Neoplasm/immunology , Cell Differentiation , Cryopreservation , Dendritic Cells/immunology , Dinoprostone/pharmacology , Electroporation , Epitopes , Humans , Interferon-gamma/pharmacology , Lipid A/analogs & derivatives , Lipid A/pharmacology , Monocytes/cytology , RNA, Messenger/genetics , T-Lymphocytes, Cytotoxic/immunology , Tumor Necrosis Factor-alpha/pharmacology
3.
Semin Cancer Biol ; 52(Pt 2): 166-177, 2018 10.
Article in English | MEDLINE | ID: mdl-29170067

ABSTRACT

Immunotherapies, specifically checkpoint inhibitors, are becoming an important component in cancer care with the most application now in melanoma and lung cancer patients. Some drawbacks that converge with this new evolution are the rather low response rates to these drugs and their high cost with a significant economic impact on the health care system. These major challenges can likely be circumvented by implementing a "personalized immuno-oncology" approach to accomplish a selection of optimal responders based on biomarkers. In this paper we first discuss the legal framework for the development of valuable in vitro diagnostics. Based on a case study in lung cancer, the clinical validity and utility requirements of predictive immuno-oncology biomarkers is highlighted and an overview is given on the evolution towards multiplex or omics-based assays together with its challenges and pitfalls. Finally, some initiatives between the public and private sector are pinpointed to sustain the future access to innovative medicines in cancer therapy at a reasonable cost.


Subject(s)
Biomarkers, Tumor/immunology , Neoplasms/immunology , Neoplasms/therapy , Antineoplastic Agents/economics , Antineoplastic Agents/immunology , Antineoplastic Agents/therapeutic use , Biomarkers, Tumor/economics , Delivery of Health Care/economics , Humans , Immunotherapy/economics , Medical Oncology/economics , Neoplasms/economics
4.
Pulm Pharmacol Ther ; 26(5): 544-54, 2013 Oct.
Article in English | MEDLINE | ID: mdl-23701918

ABSTRACT

Chronic obstructive pulmonary disease (COPD) affects more than 200 million people worldwide and is expected to become the third leading cause of death in 2020. COPD is characterized by progressive airflow limitation, due to a combination of chronic inflammation and remodeling of the small airways (bronchiolitis) and loss of elastic recoil caused by destruction of the alveolar walls (emphysema). Lung cancer is the most important cause of cancer-related death in the world. (Cigarette) smoking is the principal culprit causing both COPD and lung cancer; in addition, exposure to environmental tobacco smoke, biomass fuel smoke, coal smoke and outdoor air pollution have also been associated with an increased incidence of both diseases. Importantly, smokers with COPD--defined as either not fully reversible airflow limitation or emphysema--have a two- to four-fold increased risk to develop lung cancer. In this review, we highlight several of the genetic, epigenetic and inflammatory mechanisms, which link COPD and carcinogenesis in the lungs. Elucidating the biological pathways and networks, which underlie the increased susceptibility of lung cancer in patients with COPD, has important implications for screening, prevention, diagnosis and treatment of these two devastating pulmonary diseases.


Subject(s)
Lung Neoplasms/etiology , Pulmonary Disease, Chronic Obstructive/etiology , Smoking/adverse effects , Animals , Environmental Exposure/adverse effects , Epigenesis, Genetic , Humans , Inflammation/epidemiology , Inflammation/etiology , Inflammation/therapy , Lung Neoplasms/epidemiology , Lung Neoplasms/therapy , Mass Screening/methods , Pulmonary Disease, Chronic Obstructive/physiopathology , Pulmonary Disease, Chronic Obstructive/therapy , Smoking/epidemiology
5.
Pigment Cell Melanoma Res ; 24(2): 334-44, 2011 Apr.
Article in English | MEDLINE | ID: mdl-21029398

ABSTRACT

Spontaneous regression of benign and malignant melanocytic lesions can be a visible sign of immunosurveillance. In this review, we discuss different immune reactions against melanocytic lesions: halo nevus, Meyerson's nevus, regression in melanoma and melanoma-associated depigmentation. These entities present with particular clinical aspects, histology and evolution. In all entities, a melanocyte-specific T-cell reaction has been assumed but a different degree of melanocyte destruction is present. A focus on the immune responses in melanocytic lesions reveals several aspects of an adequate skin immunity and may help to identify the key points in the immune destruction of melanocytes. These insights can add to the knowledge of how to optimize immunotherapeutic strategies in melanoma.


Subject(s)
Immune System/immunology , Immunotherapy , Melanocytes/immunology , Melanocytes/pathology , Melanoma/immunology , Melanoma/pathology , Melanoma/therapy , Diagnosis, Differential , Humans , Melanoma/physiopathology , Nevus/immunology , Nevus/pathology , Nevus/physiopathology , Skin Neoplasms/immunology , Skin Neoplasms/pathology , Skin Neoplasms/therapy
6.
J Innate Immun ; 2(2): 96-106, 2010.
Article in English | MEDLINE | ID: mdl-20375628

ABSTRACT

The pulmonary innate immune system has evolved over millions of years to provide swift detection of inhaled microbial agents and trigger well-balanced protective responses. Much more recent on the evolutionary scale is human activity, which has resulted in the release of a new class of potentially harmful, non-microbial compounds into the air. These xenobiotics include combustion by-products such as reactive oxygen species and polycyclic aromatic hydrocarbons. This review will summarize evidence showing how airborne xenobiotics can engage pulmonary innate immunity components at many levels. We will focus on potential effects of xenobiotics on airway dendritic cells, as these constitute key innate immune sensors in the lung, with the unique ability to initiate adaptive immunity. We propose that the aberrant processing of inhaled xenobiotics by an innate immune system that is now evolutionarily maladapted underlies the increase in chronic inflammatory lung diseases in modern times.


Subject(s)
Air Pollutants/immunology , Immunity, Innate , Lung/immunology , Xenobiotics/immunology , Dendritic Cells/immunology , Humans , Polycyclic Aromatic Hydrocarbons/immunology , Reactive Oxygen Species/immunology
7.
Eur Respir J ; 35(1): 202-15, 2010 Jan.
Article in English | MEDLINE | ID: mdl-20044461

ABSTRACT

Small cell lung cancer (SCLC) is an aggressive lung tumour strongly associated with cigarette smoking, with patients often presenting with metastatic disease at the time of diagnosis. Although SCLC is very chemoradiosensitive and high response rates are obtained with treatment, relapse rates are high and the prognosis remains very poor. In limited-stage SCLC, the overall survival rate has been significantly improved by adding dose-hyperfractionated thoracic radiotherapy and prophylactic cranial irradiation to systemic chemotherapy. In contrast, little progress has been made in the treatment of extensive-stage SCLC (ES-SCLC), apart from the recently documented survival gain by the addition of prophylactic cranial irradiation. First-line therapy in ES-SCLC currently consists of chemotherapy, combining a platinum drug with either etoposide or irinotecan as a possible alternative. New treatments are needed in order to improve the prognosis of ES-SCLC, as median survival with current standard treatment is still only 9-10 months from diagnosis. The present review focuses on the management of ES-SCLC, with special attention to the development of new treatment options.


Subject(s)
Lung Neoplasms/therapy , Small Cell Lung Carcinoma/therapy , Antineoplastic Agents/therapeutic use , Combined Modality Therapy , Forecasting , Humans , Lung Neoplasms/pathology , Neoplasm Staging , Small Cell Lung Carcinoma/pathology
9.
Rehabil Res Pract ; 2010: 481546, 2010.
Article in English | MEDLINE | ID: mdl-22110966

ABSTRACT

Introduction. Respiratory cancer and its treatment are known to contribute to muscle weakness and functional impairment. Aim. To assess the effects of rehabilitation in patients with respiratory cancer. Methods. Radically treated respiratory cancer patients were included in a 12-week multidisciplinary rehabilitation program. Results. 16 patients (age: 61 ± 7 years; FEV(1): 57 ± 16% pred.) showed a reduced exercise tolerance (VO(2)max: 56 ± 15% pred.; 6 MWD: 67 ± 11% pred.), muscle force (PImax: 54 ± 22% pred.; QF: 67 ± 16% pred.), and quality of life (CRDQd: 17 ± 5 points; CRDQf: 16 ± 5 points). Exercise tolerance, muscle force, and quality of life improved significantly after rehabilitation. Conclusion. Radically treated patients with respiratory cancer have a decreased exercise capacity, muscle force, and quality of life. 12 weeks of rehabilitation leads to a significant improvement in exercise capacity, respiratory muscle force, and quality of life.

10.
Mucosal Immunol ; 2(3): 206-19, 2009 May.
Article in English | MEDLINE | ID: mdl-19262504

ABSTRACT

Exposure to cigarette smoke represents a major risk factor for the development of asthma. Enhanced sensitization toward allergens has been observed in humans and laboratory animals exposed to cigarette smoke. Pulmonary dendritic cells (DCs) are crucially involved in sensitization toward allergens and play an important role in the development of T helper (Th)2-mediated allergic airway inflammation. We propose the concept that aberrant DC activation forms the basis for the deviation of the lung's default tolerogenic response toward allergic inflammation when harmless antigens are concomittantly inhaled with tobacco smoke. This review will summarize evidence suggesting that tobacco smoke can achieve this effect by providing numerous triggers of innate immunity, which can profoundly modulate airway DC biology. Tobacco smoke can affect the airway DC network either directly or indirectly by causing the release of DC-targeted mediators from the pulmonary tissue environment, resulting in the induction of a Th2-oriented pathological immune response. A thorough knowledge of the molecular pathways involved may open the door to novel approaches in the treatment of asthma.


Subject(s)
Allergens/immunology , Cough/immunology , Dendritic Cells/immunology , Hypersensitivity/immunology , Respiratory Sounds/immunology , Smoke/adverse effects , Animals , Asthma/immunology , Asthma/pathology , Dendritic Cells/pathology , Epigenesis, Genetic , Humans , Hypersensitivity/pathology , Mice , Respiratory System/immunology , Respiratory System/pathology , Th2 Cells/immunology
11.
Rev Mal Respir ; 25(8 Pt 2): 3S173-82, 2008 Oct.
Article in French | MEDLINE | ID: mdl-18971843

ABSTRACT

Small cell lung cancer (SCLC) is an aggressive tumor with a strong association to heavy tobacco smoking. The majority of cases is metastasized at initial clinical presentation. SCLC is an extremely chemosensitive neoplasm and the combination of a platinum-derivative with etoposide represents the chemotherapeutic standard in terms of effectiveness and toxicity profile. Recently, extended stages of SCLC have benefited from the addition of prophylactic pancranial irradiation, resulting in a considerable gain in survival. Unfortunately, with its high rate of relapse, SCLC remains a tumor with a dismal prognosis, while the road towards new effective therapies is paved with failures and disillusion. Nevertheless, new chemotherapeutic agents and several targeted molecular therapies are being evaluated, in an effort to hopefully achieve the "holy Grail" of treatment in SCLC: that is a long term consolidation of a promising initial response.


Subject(s)
Lung Neoplasms/drug therapy , Small Cell Lung Carcinoma/drug therapy , Drug Therapy, Combination , Humans
12.
Eur Respir J ; 26(2): 204-13, 2005 Aug.
Article in English | MEDLINE | ID: mdl-16055867

ABSTRACT

Inflammation of the airways and lung parenchyma plays a major role in the pathogenesis of chronic obstructive pulmonary disease. In the present study a murine model of tobacco smoke-induced emphysema was used to investigate the time course of airway and pulmonary inflammatory response, with a special emphasis on pulmonary dendritic cell (DC) populations. Groups of mice were exposed to either cigarette smoke or to control air for up to 24 weeks. In response to cigarette smoke, inflammatory cells (i.e. neutrophils, macrophages and lymphocytes) progressively accumulated both in the airways and lung parenchyma of mice. Furthermore, a clear infiltration of DCs was observed in airways (10-fold increase) and lung parenchyma (1.5-fold increase) of cigarette-exposed mice at 24 weeks. Flow cytometric analysis of bronchoalveolar lavage (BAL) DCs of smoke-exposed mice showed upregulation of major histocompatability complex II molecules and costimulatory molecules CD40 and CD86, compared with BAL DCs of air-exposed mice. Morphometric analysis of lung histology demonstrated a significant increase in mean linear intercept and alveolar wall destruction after 24 weeks of smoke exposure. In conclusion, the time course of the changes in inflammatory and dendritic cells in both bronchoalveolar lavage and the pulmonary compartment of cigarette smoke-exposed mice was carefully characterised.


Subject(s)
Pneumonia/etiology , Pneumonia/pathology , Pulmonary Emphysema/etiology , Pulmonary Emphysema/pathology , Smoking/adverse effects , Animals , Bronchoalveolar Lavage Fluid , Cell Count , Dendritic Cells , Disease Models, Animal , Male , Mice , Mice, Inbred C57BL , Time Factors
13.
J Exp Med ; 193(1): 51-60, 2001 Jan 01.
Article in English | MEDLINE | ID: mdl-11136820

ABSTRACT

Antigen transport from the airway mucosa to the thoracic lymph nodes (TLNs) was studied in vivo by intratracheal instillation of fluorescein isothiocyanate (FITC)-conjugated macromolecules. After instillation, FITC(+) cells with stellate morphology were found deep in the TLN T cell area. Using flow cytometry, an FITC signal was exclusively detected in CD11c(med-hi)/major histocompatibility complex class II (MHCII)(hi) cells, representing migratory airway-derived lymph node dendritic cells (AW-LNDCs). No FITC signal accumulated in lymphocytes and in a CD11c(hi)MHCII(med) DC group containing a CD8 alpha(hi) subset (non-airway-derived [NAW]-LNDCs). Sorted AW-LNDCs showed long MHCII(bright) cytoplasmic processes and intracytoplasmatic FITC(+) granules. The fraction of FITC(+) AW-LNDCs peaked after 24 h and had reached baseline by day 7. AW-LNDCs were depleted by 7 d of ganciclovir treatment in thymidine kinase transgenic mice, resulting in a strong reduction of FITC-macromolecule transport into the TLNs. Compared with intrapulmonary DCs, AW-LNDCs had a mature phenotype and upregulated levels of MHCII, B7-2, CD40, and intracellular adhesion molecule (ICAM)-1. In addition, sorted AW-LNDCs from FITC-ovalbumin (OVA)-instilled animals strongly presented OVA to OVA-TCR transgenic T cells. These results validate the unique sentinel role of airway DCs, picking up antigen in the airways and delivering it in an immunogenic form to the T cells in the TLNs.


Subject(s)
Antigen Presentation , Dendritic Cells/immunology , Lung/cytology , Lung/immunology , Lymph Nodes/cytology , Lymph Nodes/immunology , Animals , Biological Transport, Active , Cell Movement , Dendritic Cells/physiology , Fluorescein-5-isothiocyanate , Fluorescent Dyes , Immunophenotyping , Male , Mice , Mice, Inbred BALB C , Mice, Inbred C57BL , Mice, Inbred DBA , Mice, Transgenic , Ovalbumin/immunology
14.
Am J Respir Cell Mol Biol ; 20(6): 1165-74, 1999 Jun.
Article in English | MEDLINE | ID: mdl-10340935

ABSTRACT

Eosinophilic airway inflammation is orchestrated by T-helper (Th)-2 lymphocytes. We have previously demonstrated that dendritic cells (DC) are essential for the presentation of antigen to these Th2 cells leading to airway inflammation. Here, we have examined the presence of DC in the lungs, the kinetics of appearance, and the possible involvement of the bone-marrow progenitor for DC in a rat model of ovalbumin (OVA)-induced airway inflammation. Sensitized rats were exposed to 0, 1, 3, or 7 consecutive daily OVA aerosols. Control rats were sham sensitized and/or exposed to phosphate-buffered saline (PBS), and bronchoalveolar lavage (BAL) was performed 24 h after the last challenge. DC were identified in BAL fluid as low-density, low-autofluorescence, CD3(-), CD45RA-, OX62(+), OX6(+) cells that had long surface extensions and strong costimulatory activity. Low but detectable amounts of BAL DC were seen in sensitized, unexposed animals. After three OVA exposures, the inflammatory infiltrate consisted of CD4(+)-activated T cells, eosinophils, and monocytes. The number of BAL DC was significantly increased in OVA-sensitized/OVA-exposed animals compared with sham-sensitized or PBS-exposed animals. The kinetics of DC increase closely parallelled those in other inflammatory cells. Bone-marrow cells taken from the OVA-sensitized and -exposed group were grown in the DC growth factor granulocyte macrophage colony-stimulating factor for 6 d and the yield of OX62(+)OX6(+) DC was 60% higher compared with PBS-exposed or sham-sensitized animals. We conclude that allergen exposition in sensitized rats increases the number of DC in the airways and the production of progenitors for DC in the bone marrow.


Subject(s)
Bone Marrow/immunology , Dendritic Cells/immunology , Pneumonia/immunology , Stem Cells/immunology , Animals , Asthma/immunology , Bronchoalveolar Lavage Fluid , Dose-Response Relationship, Drug , Eosinophils/immunology , Flow Cytometry , Immunoglobulin E/analysis , Kinetics , Male , Ovalbumin/pharmacology , Rats , Serine Proteinase Inhibitors/pharmacology , T-Lymphocytes/immunology , Time Factors , Up-Regulation
15.
Cancer Genet Cytogenet ; 27(1): 39-44, 1987 Jul.
Article in English | MEDLINE | ID: mdl-3472648

ABSTRACT

Nine cases of myelodysplastic syndrome with a deletion of the long arm of chromosome #11 (11q-) showed ringed sideroblasts, and three of which had an acquired sideroblastic anemia according to the criteria of the FAB classification. In contrast, among four cases of myelodysplastic syndromes with translocation of extra material to the long arm of chromosome #11 (11q+), only one showed bone marrow sideroblasts. These results strongly indicate that an 11q- chromosome is a marker of iron overload in myelodysplastic syndromes. Within the cases of 11q- associated with sideroblastosis, two cytogenetically different anomalies (i.e., terminal or interstitial deletions) were delineated.


Subject(s)
Anemia, Sideroblastic/genetics , Chromosome Deletion , Chromosomes, Human, Pair 11 , Iron/metabolism , Adult , Aged , Anemia, Sideroblastic/metabolism , Bone Marrow/metabolism , Bone Marrow/pathology , Chromosome Banding , Female , Genetic Markers , Humans , Karyotyping , Male , Middle Aged
16.
Cancer Genet Cytogenet ; 17(3): 189-255, 1985 Jul.
Article in English | MEDLINE | ID: mdl-3891074

ABSTRACT

A deletion of the long arm of chromosome #5 (5q-) occurs nonrandomly in human malignancies. As a rule, the deletion is interstitial; the distal breakpoint by conventional techniques is usually in band q32, the proximal breakpoints in q12 or q14. Variant breakpoints occur in less than 10% of all cases. As the sole anomaly, 5q- is characteristically found in refractory anemia with or without excess of blasts. It can occur as the sole anomaly in de novo or secondary acute nonlymphocytic leukemia, but is usually accompanied in those disorders by other chromosome changes that are also nonrandomly distributed. In addition, it can be found in lymphoproliferative disorders, and occasionally, also in solid tumors. The 5q- myelodysplastic syndrome typically occurs in older age groups, particularly in females. Characteristic features are macrocytic anemia, normal or elevated platelets in the presence of megakaryocytic anomalies, and a mild clinical course. In cases with 5q- only, transformation into ANLL occurs rarely. Additional chromosome anomalies and male sex are prognostically unfavorable signs. Sex ratio is also at the disadvantage of females in de novo 5q- ANLL, and the latter disorder can occur without being preceded by a myelodysplastic phase. A myelodysplastic phase usually precedes 5q- secondary leukemia, in males as well as in females, and additional chromosome anomalies, especially of chromosome #7, are almost invariably present in those cases. We conclude that 5q- is the most frequently occurring single chromosome anomaly in secondary leukemia. Furthermore, the resemblance between de novo and secondary 5q- MDS and ANLL is striking; clinically, as well as cytogenetically, they are indistinguishable, suggesting that all de novo cases may be due to environmental (chemical) carcinogens. Response to treatment and prognosis are very poor with current therapeutic regimens in de novo as well as in secondary 5q- ANLL. Morphologically, these ANLLs fall into all FAB categories. There is considerable evidence to show that the 5q- anomaly occurs in a myeloid precursor stem cell. The occasional occurrence in lymphoid malignancies, of B cell as well as T cell type, suggests that, as in Ph-positive disorders, a common progenitor stem cell may be affected in 5q- also. The 5q- lymphoid malignancies, however, are much more rare; it is not clear at the present time whether or not a 5q- counterpart of Ph-positive ALL exists, and mixed lymphoid-myeloid 5q- disorders have not yet been documented.(ABSTRACT TRUNCATED AT 400 WORDS)


Subject(s)
Chromosome Deletion , Chromosomes, Human, 4-5 , Adult , Age Factors , Aged , Anemia, Aplastic/genetics , Blood Cell Count , Chromosome Aberrations , Female , Humans , Leukemia/genetics , Lymphoproliferative Disorders/genetics , Male , Middle Aged , Myeloproliferative Disorders/genetics , Neoplasms/genetics , Oncogenes , Sex Factors , Stem Cells/pathology
17.
Cancer Genet Cytogenet ; 12(4): 309-19, 1984 Aug.
Article in English | MEDLINE | ID: mdl-6744226

ABSTRACT

Sixteen patients with interstitial deletions of the long arm of chromosome #9 (9q-). were studied. From our observations and the findings of ten other cases in the literature, it can be deduced that the anomaly is almost exclusively found in myeloproliferative disorders and that it rarely occurs as the sole anomaly; however, in more than one-third of the cases, it was associated with a t(8;21) and occurred as a secondary event. The deletion appears to be interstitial, the breakpoints are somewhat variable, and the region carrying the abl oncogene was never involved.


Subject(s)
Chromosome Deletion , Chromosomes, Human, 6-12 and X , Hematologic Diseases/genetics , Leukemia/genetics , Lymphoma/genetics , Acute Disease , Adolescent , Adult , Aged , Chromosomes, Human, 21-22 and Y , Female , Humans , Karyotyping , Male , Middle Aged
19.
Cancer Genet Cytogenet ; 11(4): 381-7, 1984 Apr.
Article in English | MEDLINE | ID: mdl-6704939

ABSTRACT

Chromosomes were studied in 33 untreated myeloma patients, and results were correlated with the class of Ig secreted by the myeloma cells. A high incidence of clonal karyotypic anomalies seemed to be present in IgG3 myeloma patients, in whom the disease was advanced at diagnosis and rapidly progressing. Among the chromosome anomalies, the t(11;14)(q14;q32) was particularly prominent, and this chromosome anomaly, in analogy with the Ph1 chromosome, may characterize a family of lymphoproliferative disorders.


Subject(s)
Chromosome Aberrations , Multiple Myeloma/genetics , Adult , Aged , Chromosomes, Human, 13-15 , Chromosomes, Human, 21-22 and Y , Chromosomes, Human, 6-12 and X , Female , Humans , Immunoglobulin A , Immunoglobulin G , Karyotyping , Male , Middle Aged , Multiple Myeloma/immunology , Translocation, Genetic
20.
Cancer Genet Cytogenet ; 11(4): 425-8, 1984 Apr.
Article in English | MEDLINE | ID: mdl-6608403

ABSTRACT

In a retrospective study of non-Hodgkin's lymphomas, the 14q+ marker was found in at least one of the samples examined from 17 patients with B-cell lymphoproliferative diseases (LPD). In the PHA-stimulated cultures, the marker was found in each sample in 10%-100% of the cells. An indirect stimulation, as indicated by a 3H-thymidine incorporation and IG secretion, of normal B cells by a T-cell mitogen, such as PHA, has been recently documented. This phenomenon is confirmed by our chromosome analysis, which demonstrated characteristic chromosome changes in PHA-stimulated cultures of patients with B-cell malignancies and indicated that the phenomenon can be observed not only in normal B cells but also in malignant B cells.


Subject(s)
B-Lymphocytes/pathology , Lymphocyte Activation , Lymphoma/pathology , T-Lymphocytes/immunology , B-Lymphocytes/immunology , Bone Marrow/pathology , Cells, Cultured , Chromosomes, Human, 13-15 , Genetic Markers , Humans , Karyotyping , Lymph Nodes/pathology , Lymphoma/genetics , Lymphoma/immunology , Phytohemagglutinins/pharmacology
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