Bibliothek

feed icon rss

Ihre E-Mail wurde erfolgreich gesendet. Bitte prüfen Sie Ihren Maileingang.

Leider ist ein Fehler beim E-Mail-Versand aufgetreten. Bitte versuchen Sie es erneut.

Vorgang fortführen?

Exportieren
  • 1
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Histopathology 26 (1995), S. 0 
    ISSN: 1365-2559
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: The morphology, phenotype, genotype and clinical behaviour of four cases of mantle cell lymphoma (centrocytic lymphoma) presenting primarily in mucosa (two gastric, one in large bowel and one tonsillar) are reviewed. Their relationship with the broader group of mantle cell and mucosa-associated lymphoid tissue (MALT) lymphomas is also discussed. All four tumours showed a monomorphic picture of mantle cells (centrocytes) arranged in a diffuse, or vaguely nodular, pattern. Scattered non-neoplastic germinal centres were entrapped within the tumour cells, although there was no follicular colonization. In two cases distinct epithelial infiltration by tumour cells was observed. All four tumours had a CD19, CD20, CDS, IgD, Leu8 immunophenotype, whereas KiM1P and CD10 expression were absent. DRC antibody showed loose aggregates of dendritic cells in three of four cases. Three cases showed PRAD-1/Cyclin D1 overexpression by Northern blot analysis. Although we were not able to detect bcl-1 rearrangement in the major translocation cluster (MTC) breakpoint, the possibility of bcl-1 rearrangement involving other cluster breakpoints cannot be ruled out. The four cases evolved as a disseminated disease, involving either peripheral lymph nodes, spleen or bone marrow. The biological behaviour of mantle cell lymphoma presenting in mucosa appears, irrespective of localization or macroscopic presentation, similar to that of nodal mantle cell lymphoma. Their tendency to dissemination contrasts with MALT lymphomas, which tend to remain localized, and from which mucosa mantle cell lymphoma must be distinguished. The presence of lymphoepithelial lesions does not seem to be a useful differential feature, since occasional epithelial infiltration was seen in two cases. Reactivity with CD5 appears to be especially useful in distinguishing these, since all four cases were clearly positive, in contrast with what is usually found in MALT lymphomas.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 2
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 44 (1995), S. 0 
    ISSN: 1365-3059
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Radial expansion of foci in mixtures of susceptible and resistant bean cultivars was studied at two sites in Ethiopia. The foci expanded in a wave-like fashion. At Ambo (1990), radial expansion velocity ranged from 6 cm per day in mixtures with 20% susceptible plants to 15 cm per day in plots with the susceptible plants only. At Debre Zeit, the velocity ranged from 3 cm per day in a mixture with 20% susceptible plants to 16 cm per day in plots with 100% susceptible plants. At both sites the radial expansion velocity of foci correlated linearly with the logarithm of the fraction of susceptible plants in the mixture. Velocities of focus expansion at Ambo and Debre Zeit were approximately equal in plots consisting of susceptible plants only. At lower proportions of susceptible plants the velocities at Debre Zeit were lower than at Ambo. Indications were given as to the environmental factors responsible for the observed difference between sites. At each site, the variation between plots showed a clear spatial pattern, probably due to environmental factors.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 3
    ISSN: 1569-8041
    Schlagwort(e): chronic lymphocytic leukemia ; hematopoietic stem cell transplantation ; minimal residual disease ; molecular remissions
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Background: Stem-cell transplantation is a reasonable therapeutic approach for younger patients with high-risk CLL. Patients and methods: Twelve patients (seven males; median age 47 years, range 29–51) with high-risk CLL underwent transplantation (allo, n = 7; auto, n = 5). The conditioning regimen consisted of cyclophosphamide and total body irradiation in 11 patients, and BEAC in the remaining one. Minimal residual disease (MRD) was assessed by cytofluorometry and PCR. Results: All 11 evaluable patients engrafted. Of the seven allografted patients, two died of treatment-related causes; three patients developed acute GVHD. No transplant-related mortality was observed in autografted patients. After transplantation, 10 of 11 patients evaluable for response achieved CR (91%; 95% CI 59%–100%) which was molecular in nine patients (82%; 95% CI 48%–98%). One patient in CR but MRD+ relapsed nine months after transplantation and died. Seven patients remain in molecular CR for a median of 16 months (range 1–58). Estimated actuarial survival and disease-free survival at two years is 81% (95% CI 43%–100%) and 71% (95% CI 43%–99%), respectively. Relapse risk at two years is 12.5% (95% CI 0%–35.5%). Conclusions: Patients with high-risk CLL can achieve long-lasting molecular CR after SCT. The role of transplants in CLL management deserves investigation in controlled trials.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 4
    Digitale Medien
    Digitale Medien
    Springer
    The European physical journal 268 (1974), S. 145-156 
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Attenuation coefficients of perturbed gamma-ray angular correlations are calculated for classical extranuclear fields which fluctuate at random both in direction and in magnitude. Explicit expressions are given for time-integral attenuation coefficients. Time-differential attenuation coefficients have been calculated numerically. The theory applies to any correlation time.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 5
    Digitale Medien
    Digitale Medien
    Springer
    The European physical journal 253 (1972), S. 257-268 
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Perturbed angular correlation attenuation coefficients are given for randomly fluctuating extranuclear fields in the, what we call, “Fixed Orientation Gaussian Approximation” (FOGA). The fluctuating field is regarded as a stochastic Markov process with Gaussian probability distribution of the field strengths. The results are applicable to any correlation time.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 6
    Digitale Medien
    Digitale Medien
    Springer
    The European physical journal 240 (1970), S. 153-162 
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The magnetic hyperfine field acting on19F nuclei in a cubic cobalt lattice at a temperature of 450 °C has been investigated. Time dependent spin rotation has been observed following the excitation and recoil implantation with a pulsed α-particle beam using the reaction19F(α,α′)19F*. The hyperfine field isH hf (450 °C)=31.4 ± 0.5 kG. The measured amplitude of the spin rotation is only 18% of the amplitude expected for the case where all19F* nuclei are assumed to be subject to the same hyperfine field without any further perturbation. This was established by means of other implantation experiments with a copper backing using first the pulsed beam technique followed by a γ-ray angular distribution measurement in coincidence with backscattered α-particles. In copper a fast perturbation was found, which reduces the anisotropy to about 80% within a short time interval immediately after the excitation.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 7
    ISSN: 1569-8041
    Schlagwort(e): peripheral T-cell lymphomas ; prognosis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Background: Peripheral T-cell lymphomas (PTCL) account for about 10% of all lymphomas in Western countries. The aim of the present study is to analyze the initial characteristics and prognostic factors in a large series of PTCL patients. Patients and methods: 174 patients (105 male/69 female; median age 61 years) were diagnosed with PTCL according to the R.E.A.L. Classification in nine Spanish institutions between 1985 and 1996. Cutaneous lymphomas and T-cell chronic lymphocytic/prolymphocytic leukemia were excluded from the study. Univariate and multivariate analyses were used to assess the prognostic value of the main initial variables. Results: The distribution according to histology subgroup was: PTCL unspecified, 95 cases (54.4%); anaplastic large-cell Ki-1-positive (ALCL), 30 cases (17%); angioimmunoblastic T cell, 22 cases (13%); angiocentric, 14 cases (8%); intestinal T cell, 12 cases (7%), and hepatosplenic γδ T cell, one case (0.6%). As compared to the other types, ALCL presented more frequently in ambulatory performance status, without extranodal involvement, in early stage, normal serum β2-microglobulin (B2M) level and low-risk international prognostic index (IPI). Most patients were treated with adriamycin-containing regimens. The overall CR rate was 49% (69% for ALCL vs. 45% for other PTCL; P 〈 0.02). The risk of relapse was 48% at four years. Median survival of the series was 22 months (65 months for ALCL vs. 20 months for other PTCL; P = 0.03), with a four-year probability of survival of 38% (95% confidence intervals (95% CI): 28–48). In the univariate analysis, in addition to the histology, older age, poor performance status, presence of B-symptoms, extranodal involvement, bone marrow infiltration, advanced Ann Arbor stage, high serum LDH, high serum B2M, and intermediate- or high-risk IPI were related to poor survival. In the multivariate analysis the histologic subgroup (ALCL vs. other PTCL) (P = 0.02; response rate (RR): 4.3), the presence of B-symptoms (P = 0.02, RR: 2.2), and the IPI (low vs. high) (P = 0.04, RR: 2) maintained independent predictive value. When the analysis was restricted to the unspecified subtype, only IPI had independent prognostic value (P = 0.003; RR: 3.5). Conclusions: PTCL have adverse prognostic features at diagnosis, respond poorly to therapy and have short survival, with no sustained remission. ALCL constitutes a subgroup which responds better to therapy and has a longer survival.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 8
    ISSN: 1433-0458
    Schlagwort(e): Schlüsselwörter Kopf-Hals-Tumoren ; Prognostische Faktoren ; Radiochemotherapie ; Zellzyklusproteine ; Key words Head and neck tumors ; Radiochemotherapy ; Prognostic factors ; Cell-cycle regulatory proteins
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Summary Background: Primary radiochemotherapy is gaining increasing importance for the treatment of advanced head and neck squamous cell carcinomas. However, there is a lack of clinical factors concerning prognostic information in relation to treatment. In this pilot study, we examined whether molecular factors can provide such information. Patients and methods: The expression patterns and their possible prognostic relevance of the cell cycle regulatory proteins p53, p21WAF/CIP1, Rb, p16INK4A, CDK4 and Cyclin D1, MIB1 (Ki-67) and BCL-2 were analysed in pretreatment tumor biopsies from 43 patients with advanced carcinomas of the oropharynx (n=26), hypopharynx (n=10) and larynx (n=7) by applying immunohistochemistry to paraffin sections of tumor specimens. All patients were treated by the same method of an accelerated ”concomitant boost” radiochemotherapy with carboplatin in a phase II study. Median followup time was 56 months. Results: No correlation was found between any of the markers and the remission rate, T-stage, N-stage, rate of loco-regional recurrences and distant metastases. However, independent of the tumor stage, patients with CDK4/cyclin-D1 overexpressing tumors had a significantly shortened overall survival (P=0.014 and 0.026, respectively). Conclusion: The results of this pilot study indicate that CDK4 and cyclin D1 over-expression provide useful prognostic information about clinical outcome after primary radiochemotherapy of head and neck cancer patients.
    Notizen: Zusammenfassung Hintergrund: Bei fortgeschrittenen Kopf-Hals-Karzinomen wird in zunehmendem Maße die primäre Radiochemotherapie einer primär operativen Therapie vorgezogen. Klinische prognostische Faktoren für die Krankheitsverläufe nach primärer Radiochemotherapie fehlen jedoch. Die vorliegende Pilotstudie sollte klären, ob molekulare Faktoren prognostische Aussagen liefern können. Patienten und Methoden: In prätherapeutischen Biopsien von 43 Patienten mit fortgeschrittenen Karzinomen wurde die Expression der Zellzykluskomponenten p53, p21WAF/CIP1, Rb, p16INK4A, CDK4 und Cyclin D1, des Proliferationsmarkers MIB1 und des apoptosehemmenden Proteins BCL-2 immunhistochemisch bestimmt. Die Patienten wurden nach dem Protokoll einer akzelerierten „Concomitant-boost-Radiochemotherapie” mit Carboplatin im Rahmen einer Phase-II-Studie behandelt. Die mediane Beobachtungszeit zum Analysezeitpunkt betrug 56 Monate. Ergebnisse: Keiner der Marker korrelierte mit dem Tumorstadium und N-Status, den Remissionsraten nach Therapieende oder dem posttherapeutischen Auftreten von Rezidiven, Metastasen und Zweitkarzinomen. Dahingegen hatten Patienten mit CDK4- und Cyclin D1-überexprimierenden Tumoren unabhängig vom Tumorstadium eine signifikant kürzere Gesamtüberlebenszeit (p=0,014 bzw. 0,026). Schlußfolgerung: Die Ergebnisse der Pilotstudie indizieren eine prognostische Bedeutung der Überexpression von CDK4 und Cyclin D1 nach primärer Radiochemotherapie von fortgeschrittenen Kopf-Hals-Karzinomen.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 9
    ISSN: 1433-0458
    Schlagwort(e): Schüsselwörter Tonsillenkarzinome ; Onkogene humane Papillomaviren (HPV) ; Retinoblastomprotein (pRb) ; Prognose ; Key words Tonsillar squamous cell carcinomas ; Oncogenic human papillomavirus ; Retinoblastoma protein ; Prognosis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Summary In order to identify squamous cell carcinomas of the head and neck (HNSCC) with common biological and clinical features, we investigated the incidence and properties of carcinomas lacking retinoblastoma protein (pR6) cell cycle control. Of 208 HNSCC investigated, 23 (11%) showed a lack of pRb expression. The majority of these tumors (65%) were tonsillar carcinomas. The pRb-negative tonsillar tumors were all stage IV, had metastasized to lymph nodes at the time of diagnosis and were in general poorly differentiated or undifferentiated. Very significantly, the pRb-negative phenotype was strongly associated with the presence of oncogenic human papilloma viruses, implying a viral etiology and functional inactivation of pRb by the viral E7 oncoprotein. Despite the very adverse histopathological factors, patients with pRb-negative tonsillar carcinomas had a better clinical outcome, which was consistent with a uniform favorable responsiveness of these tumors to postoperative radiation therapy.
    Notizen: Zusammenfassung Hinsichtlich biologischer Tumorcharakteristika, Genese und klinischen Eigenschaften von Plattenepithelkarzinomen im Kopf-Hals-Bereich bestehen viele Unklarheiten. Zur besseren Charakterisierung dieser Karzinome wurde geprüft, ob es Tumoren mit Defekten im Retinoblastomstoffwechsel gibt und ob weitere molekulare und klinische Gemeinsamkeiten vorliegen. Bei 11% der untersuchten Plattenepithelkarzinome des Kopf-Hals-Bereichs (23 von 208) lag ein Defekt im Retinoblastomstoffwechsel vor; 15 dieser 23 Tumoren (65%) waren in der Tonsille lokalisiert. Die pRb-negativen Tumoren lagen überwiegend als Stadium IV (UICC) vor, hatten bereits in regionäre Lymphknoten metastasiert und wiesen eine geringgradige Differenzierung auf. Dagegen waren klinische Verläufe und Gesamtüberlebenszeiten nach Operation und Strahlentherapie günstig. Die molekularbiologischen Analysen zeigten folgende Gemeinsamkeiten innerhalb dieser Gruppe der Tonsillenkarzinome: Der Retinoblastom-Protein (pRb)- und Cyclin-D1-Spiegel waren erniedrigt, p16INK4a erhöht. Es zeigte sich eine starke Assoziation mit onkogenen humanen Papillomaviren (HPV), durch deren Onkogen E7 wahrscheinlich die pRb-Inaktivierung erfolgt. Damit kommt den Papillomaviren eine wesentliche Rolle für die Entstehung und besonderen klinischen Eigenschaften dieser Tonsillenkarzinome zu.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 10
    ISSN: 1433-0458
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
Schließen ⊗
Diese Webseite nutzt Cookies und das Analyse-Tool Matomo. Weitere Informationen finden Sie hier...