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1.
Nat Chem Biol ; 15(3): 232-240, 2019 03.
Artículo en Inglés | MEDLINE | ID: mdl-30692684

RESUMEN

The Bruton tyrosine kinase (BTK) inhibitor ibrutinib has substantially improved therapeutic options for chronic lymphocytic leukemia (CLL). Although ibrutinib is not curative, it has a profound effect on CLL cells and may create new pharmacologically exploitable vulnerabilities. To identify such vulnerabilities, we developed a systematic approach that combines epigenome profiling (charting the gene-regulatory basis of cell state) with single-cell chemosensitivity profiling (quantifying cell-type-specific drug response) and bioinformatic data integration. By applying our method to a cohort of matched patient samples collected before and during ibrutinib therapy, we identified characteristic ibrutinib-induced changes that provide a starting point for the rational design of ibrutinib combination therapies. Specifically, we observed and validated preferential sensitivity to proteasome, PLK1, and mTOR inhibitors during ibrutinib treatment. More generally, our study establishes a broadly applicable method for investigating treatment-specific vulnerabilities by integrating the complementary perspectives of epigenetic cell states and phenotypic drug responses in primary patient samples.


Asunto(s)
Agammaglobulinemia Tirosina Quinasa/metabolismo , Leucemia Linfocítica Crónica de Células B/tratamiento farmacológico , Adenina/análogos & derivados , Agammaglobulinemia Tirosina Quinasa/antagonistas & inhibidores , Proteínas de Ciclo Celular/metabolismo , Cromatina/fisiología , Combinación de Medicamentos , Resistencia a Antineoplásicos/genética , Epigénesis Genética/genética , Epigenómica/métodos , Humanos , Leucemia Linfocítica Crónica de Células B/genética , Piperidinas , Inhibidores de Proteínas Quinasas , Proteínas Serina-Treonina Quinasas/metabolismo , Proteínas Tirosina Quinasas/metabolismo , Proteínas Tirosina Quinasas/fisiología , Proteínas Proto-Oncogénicas/metabolismo , Pirazoles/farmacología , Pirimidinas/farmacología , Transducción de Señal , Análisis de la Célula Individual/métodos , Serina-Treonina Quinasas TOR/metabolismo , Quinasa Tipo Polo 1
2.
Br J Cancer ; 123(2): 240-251, 2020 07.
Artículo en Inglés | MEDLINE | ID: mdl-32418995

RESUMEN

BACKGROUND: High UGT2B17 is associated with poor prognosis in untreated chronic lymphocytic leukaemia (CLL) patients and its expression is induced in non-responders to fludarabine-containing regimens. We examined whether UGT2B17, the predominant lymphoid glucuronosyltransferase, affects leukaemic drug response and is involved in the metabolic inactivation of anti-leukaemic agents. METHODS: Functional enzymatic assays and patients' plasma samples were analysed by mass-spectrometry to evaluate drug inactivation by UGT2B17. Cytotoxicity assays and RNA sequencing were used to assess drug response and transcriptome changes associated with high UGT2B17 levels. RESULTS: High UGT2B17 in B-cell models led to reduced sensitivity to fludarabine, ibrutinib and idelalisib. UGT2B17 expression in leukaemic cells involved a non-canonical promoter and was induced by short-term treatment with these anti-leukaemics. Glucuronides of both fludarabine and ibrutinib were detected in CLL patients on respective treatment, however UGT2B17 conjugated fludarabine but not ibrutinib. AMP-activated protein kinase emerges as a pathway associated with high UGT2B17 in fludarabine-treated patients and drug-treated cell models. The expression changes linked to UGT2B17 exposed nuclear factor kappa B as a key regulatory hub. CONCLUSIONS: Data imply that UGT2B17 represents a mechanism altering drug response in CLL through direct inactivation but would also involve additional mechanisms for drugs not inactivated by UGT2B17.


Asunto(s)
Protocolos de Quimioterapia Combinada Antineoplásica/farmacología , Biomarcadores Farmacológicos/metabolismo , Glucuronosiltransferasa/genética , Leucemia Linfocítica Crónica de Células B/tratamiento farmacológico , Antígenos de Histocompatibilidad Menor/genética , Adenina/efectos adversos , Adenina/análogos & derivados , Adenina/farmacología , Protocolos de Quimioterapia Combinada Antineoplásica/efectos adversos , Linfocitos B/efectos de los fármacos , Linfocitos B/patología , Femenino , Regulación Neoplásica de la Expresión Génica/efectos de los fármacos , Humanos , Leucemia Linfocítica Crónica de Células B/sangre , Leucemia Linfocítica Crónica de Células B/genética , Leucemia Linfocítica Crónica de Células B/patología , Masculino , Espectrometría de Masas , Persona de Mediana Edad , FN-kappa B/genética , Piperidinas/efectos adversos , Piperidinas/farmacología , Purinas/efectos adversos , Purinas/farmacología , Quinazolinonas/efectos adversos , Quinazolinonas/farmacología , Vidarabina/efectos adversos , Vidarabina/análogos & derivados , Vidarabina/farmacología
3.
Br J Haematol ; 160(5): 618-29, 2013 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-23278106

RESUMEN

Chronic lymphocytic leukaemia (CLL) cells express constitutively activated NOTCH2 in a protein kinase C (PKC)- dependent manner. The transcriptional activity of NOTCH2 correlates not only with the expression of its target gene FCER2 (CD23) but is also functionally linked with CLL cell viability. In the majority of CLL cases, DNA-bound NOTCH2 complexes are less sensitive to the γ-secretase inhibitor (GSI) DAPT. Therefore, we searched for compounds that interfere with NOTCH2 signalling at the transcription factor level. Using electrophoretic mobility shift assays (EMSA), we identified the Aspergillum-derived secondary metabolite gliotoxin as a potent NOTCH2 transactivation inhibitor. Gliotoxin completely blocked the formation of DNA-bound NOTCH2 complexes in CLL cells independent of their sensitivity to DAPT. The inhibition of NOTCH2 signalling by gliotoxin was associated with down regulation of CD23 (FCER) expression and induction of apoptosis. Short time exposure of CLL cells indicated that the early apoptotic effect of gliotoxin is independent of proteasome regulated nuclear factor κB activity, and is associated with up regulation of NOTCH3 and NR4A1 expression. Gliotoxin could overcome the supportive effect of primary bone marrow stromal cells in an ex vivo CLL microenvironment model. In conclusion, we identified gliotoxin as a potent NOTCH2 inhibitor with a promising therapeutic potential in CLL.


Asunto(s)
Apoptosis/efectos de los fármacos , Regulación Leucémica de la Expresión Génica/efectos de los fármacos , Gliotoxina/farmacología , Leucemia Linfocítica Crónica de Células B/patología , Proteínas de Neoplasias/antagonistas & inhibidores , Receptor Notch2/antagonistas & inhibidores , Activación Transcripcional/efectos de los fármacos , Anciano , Anciano de 80 o más Años , Línea Celular Tumoral/efectos de los fármacos , Línea Celular Tumoral/patología , Técnicas de Cocultivo , Análisis Mutacional de ADN , Depresión Química , Femenino , Humanos , Cadenas Pesadas de Inmunoglobulina/genética , Concentración 50 Inhibidora , Leucemia Linfocítica Crónica de Células B/sangre , Masculino , Persona de Mediana Edad , FN-kappa B/metabolismo , Proteínas de Neoplasias/biosíntesis , Proteínas de Neoplasias/genética , Miembro 1 del Grupo A de la Subfamilia 4 de Receptores Nucleares/biosíntesis , Miembro 1 del Grupo A de la Subfamilia 4 de Receptores Nucleares/genética , Complejo de la Endopetidasa Proteasomal/metabolismo , Receptor Notch3 , Receptores Notch/biosíntesis , Receptores Notch/genética , Células del Estroma/fisiología , Factores de Transcripción/fisiología , Células Tumorales Cultivadas/efectos de los fármacos , Células Tumorales Cultivadas/patología
4.
Blood ; 116(14): 2513-21, 2010 Oct 07.
Artículo en Inglés | MEDLINE | ID: mdl-20576813

RESUMEN

Evidence suggests that tumor microenvironment is critically involved in supporting survival of chronic lymphocytic leukemia (CLL) cells. However, the molecular mechanisms of this effect and the clinical significance are not fully understood. We applied a microenvironment model to explore the interaction between CLL cells and stromal cells and to elucidate the role of phosphatidylinositol 3 kinase (PI3-K)/Akt/phosphatase and tensin homolog detected on chromosome 10 (PTEN) cascade in this process and its in vivo relevance. Primary human stromal cells from bone marrow, lymph nodes, and spleen significantly inhibited spontaneous apoptosis of CLL cells. Pan-PI3-K inhibitors (LY294002, wortmannin, PI-103), isotype-specific inhibitors of p110α, p110ß, p110γ, and small interfering RNA against PI3-K and Akt1 counteracted the antiapoptotic effect of the stromal cells. Induction of apoptosis was associated with a decrease in phosphatidylinositol-3,4,5-triphosphate, PI3-K-p85, and dephosphorylation of phosphatidylinositol-dependent kinase-1 (PDK-1), Akt1, and PTEN. Freshly isolated peripheral blood mononuclear cells from patients with CLL (n = 44) showed significantly higher levels of phosphorylated Akt1, PDK-1, PTEN, and CK2 than healthy persons (n = 8). CK2 inhibitors (4,5,6,7-tetrabromo-1H-benzotriazole, apigenin, and 5,6-dichloro-1-ß-D-ribofuranosylbenzimidazol) decreased phosphorylation of PTEN and Akt, induced apoptosis in CLL cells, and enhanced the response to fludarabine. In conclusion, bone marrow microenvironment modulates the PI3-K/Akt/PTEN cascade and prevents apoptosis of CLL cells. Combined inhibition of PI3-K/Akt and recovery of PTEN activity may represent a novel therapeutic concept for CLL.


Asunto(s)
Apoptosis , Células de la Médula Ósea/metabolismo , Leucemia Linfocítica Crónica de Células B/metabolismo , Fosfohidrolasa PTEN/metabolismo , Fosfatidilinositol 3-Quinasa/metabolismo , Proteínas Proto-Oncogénicas c-akt/metabolismo , Células de la Médula Ósea/patología , Quinasa de la Caseína II/metabolismo , Células Cultivadas , Humanos , Leucemia Linfocítica Crónica de Células B/patología , Células del Estroma/metabolismo , Células del Estroma/patología
5.
Br J Haematol ; 148(6): 868-78, 2010 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-19995395

RESUMEN

One characteristic of chronic lymphocytic leukaemia (CLL) lymphocytes is high expression of CD23, which has previously been identified as a downstream target for NOTCH2 signalling. The mechanisms regulating NOTCH2-dependent CD23 expression, however, are largely unknown. This study showed that peripheral CLL cells overexpressed transcriptionally active NOTCH2 (N2(IC)), irrespective of their prognostic marker profile. When placed in culture, NOTCH2 activity was spontaneously decreased in 25 out of 31 CLL cases (81%) within 24 h. DNA-bound N2(IC) complexes could be maintained by the protein kinase C (PKC) activator phorbol 12-myristate 13-acetate (PMA) or by gamma-interferon (IFN-gamma), two CLL characteristic inducers of CD23 expression. Inhibition of PKC-delta by RNA interference or by rottlerin antagonised PMA-induced NOTCH2 activation and also suppressed NOTCH2 activity in CLL cases with constitutively activated NOTCH2 signalling. In 23 out of 29 CLL cases tested (79%), DNA-bound N2(IC) complexes were found to be resistant to the gamma-secretase inhibitor (GSI) DAPT, suggesting that GSIs will be only effective in a subset of CLL cases. These data suggest that deregulation of NOTCH2 signalling is critically involved in maintaining the malignant phenotype of CLL lymphocytes and point to a link between PKC-delta and NOTCH2 signalling in the leukemic cells.


Asunto(s)
Leucemia Linfocítica Crónica de Células B/inmunología , Proteínas de Neoplasias/metabolismo , Proteína Quinasa C-delta/metabolismo , Receptor Notch2/metabolismo , Receptores de IgE/metabolismo , Antígenos de Neoplasias/metabolismo , Biomarcadores de Tumor/metabolismo , Humanos , Interferón gamma/inmunología , Leucemia Linfocítica Crónica de Células B/genética , Pronóstico , Proteína Quinasa C-delta/antagonistas & inhibidores , Interferencia de ARN , Receptor Notch2/genética , Transducción de Señal , Acetato de Tetradecanoilforbol/inmunología , Células Tumorales Cultivadas
6.
Cells ; 9(6)2020 06 18.
Artículo en Inglés | MEDLINE | ID: mdl-32570839

RESUMEN

NOTCH signaling represents a promising therapeutic target in chronic lymphocytic leukemia (CLL). We compared the anti-neoplastic effects of the nuclear NOTCH2 inhibitor gliotoxin and the pan-NOTCH γ-secretase inhibitor RO4929097 in primary CLL cells with special emphasis on the individual roles of the different NOTCH receptors. Gliotoxin rapidly induced apoptosis in all CLL cases tested, whereas RO4929097 exerted a variable and delayed effect on CLL cell viability. Gliotoxin-induced apoptosis was associated with inhibition of the NOTCH2/FCER2 (CD23) axis together with concomitant upregulation of the NOTCH3/NR4A1 axis. In contrast, RO4929097 downregulated the NOTCH3/NR4A1 axis and counteracted the spontaneous and gliotoxin-induced apoptosis. On the cell surface, NOTCH3 and CD23 expression were mutually exclusive, suggesting that downregulation of NOTCH2 signaling is a prerequisite for NOTCH3 expression in CLL cells. ATAC-seq confirmed that gliotoxin targeted the canonical NOTCH signaling, as indicated by the loss of chromatin accessibility at the potential NOTCH/CSL site containing the gene regulatory elements. This was accompanied by a gain in accessibility at the NR4A1, NFκB, and ATF3 motifs close to the genes involved in B-cell activation, differentiation, and apoptosis. In summary, these data show that gliotoxin recovers a non-canonical tumor-suppressing NOTCH3 activity, indicating that nuclear NOTCH2 inhibitors might be beneficial compared to pan-NOTCH inhibitors in the treatment of CLL.


Asunto(s)
Gliotoxina/farmacología , Leucemia Linfocítica Crónica de Células B/tratamiento farmacológico , Leucemia Linfocítica Crónica de Células B/metabolismo , Receptor Notch2/antagonistas & inhibidores , Receptor Notch3/agonistas , Adulto , Anciano , Anciano de 80 o más Años , Secretasas de la Proteína Precursora del Amiloide/antagonistas & inhibidores , Antineoplásicos/administración & dosificación , Antineoplásicos/farmacología , Apoptosis/efectos de los fármacos , Benzazepinas/administración & dosificación , Benzazepinas/farmacología , Supervivencia Celular/efectos de los fármacos , Relación Dosis-Respuesta a Droga , Regulación hacia Abajo/efectos de los fármacos , Femenino , Gliotoxina/administración & dosificación , Humanos , Lectinas Tipo C/antagonistas & inhibidores , Leucemia Linfocítica Crónica de Células B/patología , Masculino , Persona de Mediana Edad , Miembro 1 del Grupo A de la Subfamilia 4 de Receptores Nucleares/agonistas , Miembro 1 del Grupo A de la Subfamilia 4 de Receptores Nucleares/genética , Miembro 1 del Grupo A de la Subfamilia 4 de Receptores Nucleares/metabolismo , ARN Mensajero/genética , ARN Mensajero/metabolismo , Receptor Notch2/genética , Receptor Notch2/metabolismo , Receptor Notch3/genética , Receptor Notch3/metabolismo , Receptores de IgE/antagonistas & inhibidores , Elementos Reguladores de la Transcripción , Transducción de Señal/efectos de los fármacos , Células Tumorales Cultivadas
7.
Front Pharmacol ; 8: 319, 2017.
Artículo en Inglés | MEDLINE | ID: mdl-28736522

RESUMEN

Deregulation of NOTCH2 signaling is implicated in a wide variety of human neoplasias. The current concept of targeting NOTCH is based on using gamma secretase inhibitors (GSI) to regulate the release of the active NOTCH intracellular domain. However, the clinical outcome of GSI remains unsatisfactory. Therefore we analyzed human solid tumor derived cell lines for their nuclear NOTCH activity and evaluated the therapeutic potential of the NOTCH2 transactivation inhibitor gliotoxin in comparison to the representative GSI DAPT. Electrophoretic mobility shift assays (EMSA) were used as a surrogate method for the detection of NOTCH/CSL transcription factor complexes. The effect of gliotoxin on cell viability and its clinical relevance was evaluated in vitro and in a melanoma xenograft mouse model. Cell lines derived from melanoma (518A2), hepatocellular carcinoma (SNU398, HCC-3, Hep3B), and pancreas carcinoma (PANC1) express high amounts of nuclear NOTCH2. Gliotoxin efficiently induced apoptosis in these cell lines whereas the GSI DAPT was ineffective. The specificity of gliotoxin was demonstrated in the well differentiated nuclear NOTCH negative cell line Huh7, which was resistant to gliotoxin treatment in vitro. In xenotransplanted 518A2 melanomas, a single day dosing schedule of gliotoxin was well tolerated without any study limiting side effects. Gliotoxin significantly reduced the tumor volume in early (83 mm3 vs. 115 mm3, p = 0.008) as well as in late stage (218 mm3 vs. 576 mm3, p = 0.005) tumor models. In conclusion, NOTCH2 appears to be a key target of gliotoxin in human neoplasias and gliotoxin deserves further evaluation as a potential therapeutic agent in cancer management.

8.
Wien Klin Wochenschr ; 118(9-10): 266-72, 2006 May.
Artículo en Inglés | MEDLINE | ID: mdl-16810484

RESUMEN

BACKGROUND: Ankylosing spondylitis (AS) is a chronic inflammatory disease of the axial joints with no satisfactory therapy. Reduction of joint pain has been reported after a course of therapy at a spa, Gasteiner Heilstollen, in Badgastein in Austria. The mechanism underlying this beneficial effect is not clearly understood and objective evidence for the biological response to therapy is lacking. The aim of this study was to find evidence for a biological response to speleotherapy in patients with AS and to study the involvement of the antiinflammatory cytokine TGF-beta1 in this response. PATIENTS AND METHODS: 83 patients with AS were treated in Badgastein for 3-4 weeks. Therapy included active exercises, hyperthermia and exposure to low doses of radon in a former mine. Response to therapy was assessed from measurement of morning pain and immunoassay of serum levels of TGF-beta1 before and after therapy. Ten AS patients who received conventional therapy and 10 patients with low back pain (LBP) served as controls. RESULTS: A significant increase in TGF-beta1 (total and active) was found in AS patients after spa therapy. Mean concentration of total TGF-beta1 increased from 28,715 pg/ml to 43,136 pg/ml, (P<0.01) and active TGF-beta1 increased from 77 pg/ml to 1096 pg/ml (P<0.001). When the AS patients were divided into two groups according to pain reduction, group 1 (decrease in morning pain, responders: n=46) exhibited a 17-fold increase of active TGF-beta1 levels (96 pg/ml to 1654 pg/ml, P<0.0001) whereas group 2 (no change or an increase in morning pain: nonresponders: n=37), showed only 7-fold increase (53 pg/ml to 402 pg/ml, P<0.01). There was a moderate increase in active TGF-beta1 from 31 pg/ml to 42 pg/ml (P<0.05) in patients with LBP and no significant change was observed in the patients treated with conventional therapy. CONCLUSION: These results demonstrate a significant increase in circulating TGF-beta1 in patients with AS after the combined spa-exercise therapy in Badgastein. The results also provide evidence for a biological response to speleotherapy and suggest that TGF-beta, through its antiinflammatory function, may play a role in this response.


Asunto(s)
Balneología/métodos , Terapia por Ejercicio/métodos , Espondilitis Anquilosante/sangre , Espondilitis Anquilosante/terapia , Factor de Crecimiento Transformador beta/sangre , Adulto , Anciano , Biomarcadores/sangre , Terapia Combinada , Femenino , Humanos , Factores Inmunológicos/sangre , Masculino , Persona de Mediana Edad , Estudios Retrospectivos , Factor de Crecimiento Transformador beta1 , Resultado del Tratamiento
9.
Acute Card Care ; 16(4): 115-7, 2014 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-25101654

RESUMEN

OBJECTIVES: Stress-induced cardiomyopathy (takotsubo-syndrome, TTS) and its recurrence have not been described in myotonic dystrophy-1. CASE REPORT: The patient was a 47-year-old female who was suspected to suffer from myotonic dystrophy-1 at 20 years of age, upon the typical clinical presentation and the electrophysiological findings. During weaning from general anesthesia for resectioning of a pelvic tumour she developed ventricular fibrillation, but was successfully resuscitated. During coronary angiography two days later she experienced recurrent QT-prolongation, torsades de pointes, and ventricular fibrillation, but was successfully resuscitated again each time. Echocardiography and electrocardiography were indicative of TTS, which was confirmed by normal findings on echocardiography and electrocardiography two months later. Ten months after the first TTS she developed dyspnea, leg edema, and anginal chest pain. Recurrence of TTS was diagnosed upon a typical electrocardiography and echocardiography findings. Shortly after onset of the second TTS, she unexpectedly died from sepsis. CONCLUSIONS: TTS may also occur in patients with myotonic dystrophy-1 induced by stress from surgery, respiratory insufficiency, or infection. In patients with myotonic dystrophy-1, takotsubo-syndrome may recur and may represent a previously unreported feature of cardiac involvement in myotonic dystrophy-1.


Asunto(s)
Distrofia Miotónica/complicaciones , Cardiomiopatía de Takotsubo/complicaciones , Cardiomiopatía de Takotsubo/diagnóstico , Ecocardiografía Transesofágica , Electrocardiografía , Femenino , Humanos , Persona de Mediana Edad , Neoplasias Pélvicas/cirugía , Recurrencia , Estrés Fisiológico
10.
Int J Cancer ; 121(9): 1984-1993, 2007 Nov 01.
Artículo en Inglés | MEDLINE | ID: mdl-17621626

RESUMEN

We report high expression of the maternally imprinted gene PEG10 in high-risk B-CLL defined by high LPL mRNA expression. Differential expression was initially identified by microarray analysis and confirmed by real time PCR in 42 B-CLL patients. mRNA expression ranged from 0.3- to 375.4-fold compared to normal peripheral blood mononuclear cells (PBMNC). Expression levels in CD19+ B-CLL cells were 100-fold higher than in B-cells from healthy donors. PEG10 expression levels in B-CLL patient samples remained stable over time even after chemotherapy. High PEG10 expression correlated with high LPL expression (p=0.001) and a positive Coombs' test (p=0.04). Interestingly, similar expression patterns were observed for the neighbouring imprinted gene sarcoglycan-epsilon (SGCE). Monoallelic expression and maintained imprinting of PEG10 were found by allele- or methylation-specific PCR. The intensity of intracellular staining of PEG10 protein corresponded to mRNA levels as confirmed by immunofluorescence staining. Short term knock-down of PEG10 in B-CLL cells and HepG2 cells was not associated with changes in cell survival but resulted in a significant change in the expression of 80 genes. However, long term inhibition of PEG10 led to induction of apoptosis in B-CLL cells. Our data indicate (i) a prognostic value of PEG10 in B-CLL patients; (ii) specific deregulation of the imprinted locus at 7q21 in high-risk B-CLL; (iii) a potential functional and biological role of PEG10 protein expression. Altogether, PEG10 represents a novel marker in B-CLL.


Asunto(s)
Cromosomas Humanos Par 7/genética , Regulación Neoplásica de la Expresión Génica , Impresión Genómica/genética , Leucemia Linfocítica Crónica de Células B/genética , Leucemia Linfocítica Crónica de Células B/patología , Proteínas/genética , Alelos , Proteínas Reguladoras de la Apoptosis , Biomarcadores de Tumor , Línea Celular Tumoral , Metilación de ADN , Proteínas de Unión al ADN , Regulación hacia Abajo , Salud , Humanos , Leucemia Linfocítica Crónica de Células B/metabolismo , Proteínas Nucleares/genética , Polisacáridos/metabolismo , Proteínas/metabolismo , ARN Mensajero/genética , ARN Interferente Pequeño/genética , Proteínas de Unión al ARN , Factores de Riesgo , Tasa de Supervivencia , Ubiquitina-Proteína Ligasas/genética
11.
Cancer ; 107(10): 2408-16, 2006 Nov 15.
Artículo en Inglés | MEDLINE | ID: mdl-17054106

RESUMEN

BACKGROUND: In previous studies, alemtuzumab demonstrated considerable activity in patients with previously treated B-cell chronic lymphocytic leukemia (CLL), including fludarabine-refractory disease. In this retrospective study, the authors evaluated the benefit of alemtuzumab monotherapy in unselected patients with advanced, previously treated CLL who received treatment in the routine clinical setting. METHODS: Data were collected from 115 consecutive patients who received alemtuzumab therapy at 25 participating centers in Austria. Patients received a median of 3 prior lines of therapy (range, 1-11 prior lines of therapy), and 59% had fludarabine-refractory disease. Alemtuzumab was administered intravenously or subcutaneously with a planned schedule of 30 mg 3 times per week for up to 12 weeks. Patients received valacyclovir and trimethoprim/sulfamethoxazole for antiinfective prophylaxis. RESULTS: The overall response rate was 23%, with complete responses achieved in 5% of patients. Stable disease (SD) was achieved in 36% of patients. After a median follow-up of 17.5 months, the median overall survival (OS) was 20.2 months for all patients. A multivariate Cox regression analysis that included pretreatment baseline characteristics, response to therapy, and cumulative dose of alemtuzumab indicated that bulky lymphadenopathy, the administration of > r =3 previous therapies, and lack of response to alemtuzumab remained significant independent risk factors for inferior OS. The median OS had not been reached for responding patients. The median OS was 29.5 months for patients with SD and 10.8 months for patients with progressive disease. CONCLUSIONS: The broad use of alemtuzumab in the routine clinical practice setting is feasible and active in unselected patients with pretreated CLL, and the current results confirmed the activity and safety of this agent, as reported in previously published clinical studies.


Asunto(s)
Anticuerpos Monoclonales/uso terapéutico , Anticuerpos Antineoplásicos/uso terapéutico , Leucemia Linfocítica Crónica de Células B/tratamiento farmacológico , Anciano , Anciano de 80 o más Años , Alemtuzumab , Anticuerpos Monoclonales/efectos adversos , Anticuerpos Monoclonales Humanizados , Anticuerpos Antineoplásicos/efectos adversos , Antineoplásicos/efectos adversos , Antineoplásicos/uso terapéutico , Austria , Progresión de la Enfermedad , Relación Dosis-Respuesta a Droga , Esquema de Medicación , Femenino , Humanos , Leucemia Linfocítica Crónica de Células B/mortalidad , Masculino , Persona de Mediana Edad , Recurrencia , Estudios Retrospectivos , Terapia Recuperativa/métodos , Análisis de Supervivencia
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