RESUMO
Monosomy 7 arises as a recurrent chromosome aberration in donor cell leukemia after hematopoietic stem cell transplantation. We report a new case of donor cell leukemia with monosomy 7 following HLA-identical allogenic bone marrow transplantation for severe aplastic anemia (SAA). The male patient received a bone marrow graft from his sister, and monosomy 7 was detected only in the XX donor cells, 34 months after transplantation. The patient's bone marrow microenvironment may have played a role in the leukemic transformation of the donor hematopoietic cells.
RESUMO
We report the case of a five-month-old black male infant who had recurrent episodes of respiratory infections and also presented anemia and enlargements of the spleen, liver and lymphnodes. Hematological analysis revealed morphological abnormalities with megaloblastic dyserythropoiesis, while fetal hemoglobin assaying showed normal levels. Conventional and molecular cytogenetic analysis revealed monosomy of chromosome 7. Despite all therapeutic efforts during allogenic bone marrow transplantation, the child died due to generalized infection. The clinical and genetic distinctions between monosomy 7 syndrome and myelodysplastic disorders in childhood are discussed.(AU)
Assuntos
Humanos , Masculino , Lactente , Síndromes Mielodisplásicas , Transtornos Mieloproliferativos , Monossomia , Cromossomos Humanos Par 7 , Análise Citogenética , LeucemiaRESUMO
CONTEXT AND OBJECTIVE: Following hematopoietic stem cell transplantation (HSCT), karyotypingis a valuable tool for monitoring engraftment and disease status. Few studies have examined the prognostic signifi cance of karyotypes in patientswho underwent HSCT for chronic myeloid leukemia (CML). The objective of this study was to evaluate the signifi cance of pretransplantationcytogenetic status in relation to outcomes following HSCT in CML patients.DESIGN AND SETTING: Case series study at Instituto Nacional do Cncer (INCA), Rio de Janeiro, Brazil.METHODS: Cytogenetic analysis was performed by G banding on 39 patients treated with HSCT.RESULTS: Thirty-one patients were in the chronic phase and eight were in the accelerated phase. Prior to HSCT, additional chromosomal abnormalitieson the Philadelphia (Ph) chromosomewere found in 11 patients. The most frequent additional abnormality was a double Ph, which was observed in four cases. Following HSCT, full chimeras were observed in 31 patients (79.5%).Among these, 23 (82.3%) had presented Ph as the sole abnormality. Mixed chimeras were observed in seven patients, of which three hadadditional abnormalities. Only one case did not present any cytogenetic response. Five patients presented cytogenetic relapse associated withclinical relapse following HSCT. Twenty-seven patients are still alive and present complete hematological and cytogenetic remission.CONCLUSION: In our study, the presence of additional abnormalities was not associated with worse outcome and relapse risk. Also, nodifferences in survival rates were observed. Our study supports the view that classical cytogenetic analysis remains an important tool regardingHSCT outcome.(AU)
CONTEXTO E OBJETIVO: Ap¢s o transplante de clulas tronco-hematopoticas (TCTH), o cari¢tipo uma ferramenta valiosa para monitorar o status do enxerto e da doena. Poucos estudos investigaram osignifi cado progn¢stico do cari¢tipo nos pacientes que se submeteram ao TCTH para leucemia miel¢idecrnica (LMC). O objetivo desse estudo foi verifi car o signifi cado dos achados citogenticos pr-TCTH empacientes portadores de LMC.TIPO DE ESTUDO E LOCAL: Srie de casos. Instituto Nacional do Cncer (INCA), Rio de Janeiro, Brasil.METODOLOGIA: Foram realizados estudos citogenticos por bandeamento G em 39 pacientes submetidos ao TCTH.RESULTADOS: Trinta e um pacientes estavam em fase crnica e oito em fase acelerada. Pr-TCTH, alteraäescromossmicas adicionais ao cromossomo Philadelphia (Ph) foram observadas em 11 pacientes. A maisfreqente foi o duplo Ph observado em quatro casos. Ap¢s o TCTH, quimerismo total foi observado em31 pacientes (79,5%). Desses, 23 (82,3%) apresentavam somente o cromossomo Ph. Quimerismo mistofoi observado em sete pacientes, sendo trs com alteraäes adicionais ao Ph. Um caso nÆo apresentouresposta ao TCTH. Reca¡da citogentica associada com reca¡da cl¡nica foi observada em cinco pacientes. Ap¢s o TCTH, 27 pacientes permanecem vivos e com remissÆo cl¡nica e citogentica.CONCLUSÇO: Em nosso estudo a presena de alteraäes cromossmicas adicionais ao Ph, prvias ao TCTH, nÆo foi associada com pior evoluÆo, com risco de reca¡da, bem como nÆo foi observada diferena entre as taxas de sobrevida. Nosso estudo sugere que a citogentica cl ssica permanece uma grande ferramenta no monitoramento do TCTH.(AU)
Assuntos
Humanos , Masculino , Feminino , Transplante de Células-Tronco Hematopoéticas , Leucemia Mielogênica Crônica BCR-ABL Positiva , Aberrações Cromossômicas , Cromossomo Filadélfia , PrognósticoRESUMO
Alterations involving the short arm of chromosome 17 (17p) during the progression of chronic myeloid leukemia(CML) have been described. This chromosomal region contains the tumor suppressor gene TP53 that may be animportant factor in the evolution of this disease. In this study, we used flow cytometry and western blotting to assessp53 protein expression and single stranded conformational polymorphism to examine TP53 gene alterations in three patients with CML who showed alterations in 17p. Only the case with del(17)(p11) had p53 expression positive by flow cytometry and an abnormal migration pattern by SSCP analysis. The importance of the correlation between the results obtained with these techniques, as well as the clinical course of the patients, are discussed (AU)
Assuntos
Humanos , Leucemia Mieloide Crônica Atípica BCR-ABL Negativa , Cromossomos Humanos Par 17 , Genes p53 , Proteína Supressora de Tumor p53RESUMO
CONTEXT AND OBJECTIVE: Following hematopoietic stem cell transplantation (HSCT), karyotyping is a valuable tool for monitoring engraftment and disease status. Few studies have examined the prognostic significance of karyotypes in patients who underwent HSCT for chronic myeloid leukemia (CML). The objective of this study was to evaluate the significance of pretransplantation cytogenetic status in relation to outcomes following HSCT in CML patients. DESIGN AND SETTING: Case series study at Instituto Nacional do Câncer (INCA), Rio de Janeiro, Brazil. METHODS: Cytogenetic analysis was performed by G banding on 39 patients treated with HSCT. RESULTS: Thirty-one patients were in the chronic phase and eight were in the accelerated phase. Prior to HSCT, additional chromosomal abnormalities on the Philadelphia (Ph) chromosome were found in 11 patients. The most frequent additional abnormality was a double Ph, which was observed in four cases. Following HSCT, full chimeras were observed in 31 patients (79.5%). Among these, 23 (82.3%) had presented Ph as the sole abnormality. Mixed chimeras were observed in seven patients, of which three had additional abnormalities. Only one case did not present any cytogenetic response. Five patients presented cytogenetic relapse associated with clinical relapse following HSCT. Twenty-seven patients are still alive and present complete hematological and cytogenetic remission. CONCLUSION: In our study, the presence of additional abnormalities was not associated with worse outcome and relapse risk. Also, no differences in survival rates were observed. Our study supports the view that classical cytogenetic analysis remains an important tool regarding HSCT outcome.
Assuntos
Aberrações Cromossômicas , Transplante de Células-Tronco Hematopoéticas , Leucemia Mielogênica Crônica BCR-ABL Positiva/genética , Cromossomo Filadélfia , Adolescente , Adulto , Brasil/epidemiologia , Feminino , Humanos , Cariotipagem , Leucemia Mielogênica Crônica BCR-ABL Positiva/mortalidade , Masculino , Pessoa de Meia-Idade , Prognóstico , Análise de Sobrevida , Condicionamento Pré-TransplanteRESUMO
We report a new case of therapy-related acute myeloid leukemia in a child with Langerhans cell histiocytosis. This patient was previously treated with a protocol of multidrug chemotherapy, containing a relatively low dose of etoposide (total dose of 900/m(2)). Twenty-six months after the end of the therapy, the patient returned to the hospital with fever and anemia. The white blood cell count was 53 x 10(9)/L. The bone marrow examination showed massive infiltration with French-American-British acute myeloid leukemia classification M4 blast cells. The patient did not respond to an intensive treatment with high dose ARA-C and idarubicin. He died 6 months later. The cytogenetic abnormality of the blast cells was a t(11;11)(p13 -15;q23), that has not been described before in a secondary leukemia case.
Assuntos
Cromossomos Humanos Par 11/genética , Inibidores Enzimáticos/efeitos adversos , Etoposídeo/efeitos adversos , Histiocitose de Células de Langerhans/tratamento farmacológico , Leucemia Mielomonocítica Aguda/genética , Segunda Neoplasia Primária/genética , Inibidores da Topoisomerase II , Translocação Genética , Protocolos de Quimioterapia Combinada Antineoplásica/uso terapêutico , Pré-Escolar , Citarabina/administração & dosagem , Quimioterapia Combinada , Etoposídeo/administração & dosagem , Evolução Fatal , Humanos , Idarubicina/administração & dosagem , Cariotipagem , Leucemia Mielomonocítica Aguda/induzido quimicamente , Leucemia Mielomonocítica Aguda/tratamento farmacológico , Masculino , Segunda Neoplasia Primária/induzido quimicamente , Complexo de Proteínas Formadoras de Poros Nucleares/genética , Prednisolona/administração & dosagem , Prednisolona/uso terapêutico , Vimblastina/administração & dosagem , Vimblastina/uso terapêuticoRESUMO
We report the cytogenetic analysis of newly diagnosed Brazilian children with acute lymphocytic leukemia (ALL). We investigated 100 ALL cases from four different institutions in Rio de Janeiro. The frequency of chromosomal abnormalities was 92.3%. The karyotype profile and recurrent abnormalities found in this study do not differ essentially from those described by other groups. Although the Brazilian population is usually the product of different ethnic groups, our results show that the frequency of each recurrent abnormality is similar to that found in populations without our degree of diverse ethnic composition. Hence, our results suggest that childhood ALL in Brazil has the same biological features as that in developed countries, supporting the use of similar treatment protocols. We can therefore expect to reach the same survival rates in the coming years, depending possibly on the efficacy of the support therapy and extent of social assistance.
Assuntos
Aberrações Cromossômicas , Leucemia-Linfoma Linfoblástico de Células Precursoras/diagnóstico , Leucemia-Linfoma Linfoblástico de Células Precursoras/genética , Adolescente , Brasil , Criança , Pré-Escolar , Análise Citogenética , Feminino , Humanos , Imunofenotipagem , Lactente , Masculino , Ploidias , Leucemia-Linfoma Linfoblástico de Células Precursoras/patologiaRESUMO
We report the cytogenetic analysis of newly diagnosed Brazilian children with acute lymphocytic leukemia(ALL). We investigated 100 ALL cases from four different institutions in Rio de Janeiro. The frequencyof chromosomal abnormalities was 92.3%. The karyotype profile and recurrent abnormalitiesfound in this study do not differ essentially from those described by other groups. Although the Brazilianpopulation is usually the product of different ethnic groups, our results show that the frequency of each recurrentabnormality is similar to that found in populations without our degree of diverse ethnic composition.Hence, our results suggest that childhood ALL in Brazil has the same biological features as that indeveloped countries, supporting the use of similar treatment protocols. We can therefore expect to reachthe same survival rates in the coming years, depending possibly on the efficacy of the support therapy andextent of social assistance.(AU)
Assuntos
Humanos , Masculino , Feminino , Análise Citogenética , Leucemia-Linfoma de Células T do Adulto/diagnóstico , Leucemia-Linfoma de Células T do Adulto/epidemiologia , Leucemia Aguda Bifenotípica/diagnóstico , Leucemia Aguda Bifenotípica/epidemiologia , /epidemiologia , RIO DE JANEIRORESUMO
Imatinib induces a complete cytogenetic response in more than 80% of newly diagnosed patients with chronicmyeloid leukemia (CML) in the chronic phase (CP) and in 41% of patients in the first chronic phase after failureof interferon- treatment. However, some patients do not respond completely. Therefore, according to moststudies, drug resistance in CML patients treated with imatinib is correlated with cytogenetic abnormalities acquiredduring treatment. In this study we analyzed 48 CML patients treated with imatinib mesylate after interferon- resistance in order to elucidate the impact of additional chromosomal abnormalities prior to imatinib in response to therapy. Cytogenetic abnormalities in addition to the Philadelphia chromosome (Ph) were detected in 33.3% of patients. Patients with Ph as the sole cytogenetic abnormality prior to imatinib therapy presented a major cytogeneticresponse and significantly longer median overall survival (p=0.006) than patients with additional chromosomalabnormalities. Therefore, in this group of patients, another choice of treatment should be considered, such as stemcell transplantation or combination regimens as appropriate. The present study indicates the importance of detecting a double Ph chromosome prior to imatinib therapy. Patients showing this abnormality did not respond to imatinib, thus indicating the abnormality's association with resistance. Our study suggests that classical cytogenetic analysisis still an important tool prior to and during follow-up of CML patients treated with imatinib.(AU)
Imatinibe induz resposta citogentica completa em cerca de 80 por cento dos pacientes diagnosticados com leucemia miel¢ide crnica (LMC) em fase crnica (FC), e em 41 por cento dos pacientes em primeira FC ap¢s falha do tratamento com interferon-alfa. Alguns pacientes, entretanto, nÆo respondem completamente. Em muitos estudos, a resistncia droga em pacientes tratados com imatinibe correlacionada a alteraäes cromossmicas adquiridas durante o tratamento. No presente estudo, foram analisados 48 pacientes tratados com imatinibe ap¢s resistncia ao interferon-alfa, com o objetivo de verificar o impacto das alteraäes cromossmicas adicionais ao Philadelphia (Ph), prvias terapia com imatinibe. Alteraäes adicionais foram detectadas em 33,3 por cento dos pacientes. Pacientes com somente o cromossomo Ph apresentaram melhor taxa de resposta citogentica e sobrevida global significativa maior quando comparados com os pacientes que apresentavam alteraäes cromossmicas adicionais antes do in¡cio da terapia com imatinibe. Assim, nesse grupo de pacientes, a escolha de outra conduta teraputica, como o transplante de clulas tronco-hematopoticas ou regime de combinaÆo de drogas, pode ser indicada. O presente estudo indica a importncia do duplo Ph antesdo in¡cio da terapia com imatinibe. Todos os pacientes com esta alteraÆo nÆo responderam ao tratamento, sendo a mesma associada resistncia droga. Este estudo sugere que a citogentica cl ssica permanece como uma ferramenta importante no monitoramento de pacientes portadores de LMC tratados com imatinibe.(AU)
Assuntos
Humanos , Masculino , Feminino , Adolescente , Adulto , Pessoa de Meia-Idade , Idoso , Leucemia Mielogênica Crônica BCR-ABL Positiva/tratamento farmacológico , Leucemia Mielogênica Crônica BCR-ABL Positiva/genética , Análise Citogenética , Mesilatos/uso terapêutico , Cromossomo Filadélfia , Aberrações CromossômicasRESUMO
We report the case of a five-month-old black male infant who had recurrent episodes of respiratory infections and also presented anemia and enlargements of the spleen, liver and lymphnodes. Hematological analysis revealed morphological abnormalities with megaloblastic dyserythropoiesis, while fetal hemoglobin assaying showed normal levels. Conventional and molecular cytogenetic analysis revealed monosomy of chromosome 7. Despite all therapeutic efforts during allogenic bone marrow transplantation, the child died due to generalized infection. The clinical and genetic distinctions between monosomy 7 syndrome and myelodysplastic disorders in childhood are discussed.
Assuntos
Humanos , Masculino , Lactente , Monossomia , Síndromes Mielodisplásicas , Transtornos Mieloproliferativos , Análise Citogenética , LeucemiaRESUMO
Imatinib induces a complete cytogenetic response in more than 80% of newly diagnosed patients with chronicmyeloid leukemia (CML) in the chronic phase (CP) and in 41% of patients in the first chronic phase after failureof interferon- treatment. However, some patients do not respond completely. Therefore, according to moststudies, drug resistance in CML patients treated with imatinib is correlated with cytogenetic abnormalities acquiredduring treatment. In this study we analyzed 48 CML patients treated with imatinib mesylate after interferon- resistance in order to elucidate the impact of additional chromosomal abnormalities prior to imatinib in response to therapy. Cytogenetic abnormalities in addition to the Philadelphia chromosome (Ph) were detected in 33.3% of patients. Patients with Ph as the sole cytogenetic abnormality prior to imatinib therapy presented a major cytogeneticresponse and significantly longer median overall survival (p=0.006) than patients with additional chromosomalabnormalities. Therefore, in this group of patients, another choice of treatment should be considered, such as stemcell transplantation or combination regimens as appropriate. The present study indicates the importance of detecting a double Ph chromosome prior to imatinib therapy. Patients showing this abnormality did not respond to imatinib, thus indicating the abnormality's association with resistance. Our study suggests that classical cytogenetic analysisis still an important tool prior to and during follow-up of CML patients treated with imatinib.
Imatinibe induz à resposta citogenética completa em cerca de 80 por cento dos pacientes diagnosticados com leucemia mielóide crônica (LMC) em fase crônica (FC), e em 41 por cento dos pacientes em primeira FC após falha do tratamento com interferon-alfa. Alguns pacientes, entretanto, não respondem completamente. Em muitos estudos, a resistência à droga em pacientes tratados com imatinibe é correlacionada a alterações cromossômicas adquiridas durante o tratamento. No presente estudo, foram analisados 48 pacientes tratados com imatinibe após resistência ao interferon-alfa, com o objetivo de verificar o impacto das alterações cromossômicas adicionais ao Philadelphia (Ph), prévias à terapia com imatinibe. Alterações adicionais foram detectadas em 33,3 por cento dos pacientes. Pacientes com somente o cromossomo Ph apresentaram melhor taxa de resposta citogenética e sobrevida global significativa maior quando comparados com os pacientes que apresentavam alterações cromossômicas adicionais antes do início da terapia com imatinibe. Assim, nesse grupo de pacientes, a escolha de outra conduta terapêutica, como o transplante de células tronco-hematopoéticas ou regime de combinação de drogas, pode ser indicada. O presente estudo indica a importância do duplo Ph antesdo início da terapia com imatinibe. Todos os pacientes com esta alteração não responderam ao tratamento, sendo a mesma associada à resistência à droga. Este estudo sugere que a citogenética clássica permanece como uma ferramenta importante no monitoramento de pacientes portadores de LMC tratados com imatinibe.
Assuntos
Humanos , Masculino , Feminino , Adolescente , Adulto , Pessoa de Meia-Idade , Aberrações Cromossômicas , Análise Citogenética , Leucemia Mielogênica Crônica BCR-ABL Positiva/genética , Leucemia Mielogênica Crônica BCR-ABL Positiva/tratamento farmacológico , Mesilatos , Cromossomo FiladélfiaRESUMO
CONTEXT AND OBJECTIVE: Following hematopoietic stem cell transplantation (HSCT), karyotyping is a valuable tool for monitoring engraftment and disease status. Few studies have examined the prognostic significance of karyotypes in patients who underwent HSCT for chronic myeloid leukemia (CML). The objective of this study was to evaluate the significance of pretransplantation cytogenetic status in relation to outcomes following HSCT in CML patients. DESIGN AND SETTING: Case series study at Instituto Nacional do Câncer (INCA), Rio de Janeiro, Brazil. METHODS: Cytogenetic analysis was performed by G banding on 39 patients treated with HSCT. RESULTS: Thirty-one patients were in the chronic phase and eight were in the accelerated phase. Prior to HSCT, additional chromosomal abnormalities on the Philadelphia (Ph) chromosome were found in 11 patients. The most frequent additional abnormality was a double Ph, which was observed in four cases. Following HSCT, full chimeras were observed in 31 patients (79.5 percent). Among these, 23 (82.3 percent) had presented Ph as the sole abnormality. Mixed chimeras were observed in seven patients, of which three had additional abnormalities. Only one case did not present any cytogenetic response. Five patients presented cytogenetic relapse associated with clinical relapse following HSCT. Twenty-seven patients are still alive and present complete hematological and cytogenetic remission. CONCLUSION: In our study, the presence of additional abnormalities was not associated with worse outcome and relapse risk. Also, no differences in survival rates were observed. Our study supports the view that classical cytogenetic analysis remains an important tool regarding HSCT outcome.
RESUMO CONTEXTO E OBJETIVO: Após o transplante de células tronco-hematopoéticas (TCTH), o cariótipo é uma ferramenta valiosa para monitorar o status do enxerto e da doença. Poucos estudos investigaram o significado prognóstico do cariótipo nos pacientes que se submeteram ao TCTH para leucemia mielóide crônica (LMC). O objetivo desse estudo foi verificar o significado dos achados citogenéticos pré-TCTH em pacientes portadores de LMC. TIPO DE ESTUDO E LOCAL: Série de casos. Instituto Nacional do Câncer (INCA), Rio de Janeiro, Brasil. METODOLOGIA: Foram realizados estudos citogenéticos por bandeamento G em 39 pacientes submetidos ao TCTH. RESULTADOS: Trinta e um pacientes estavam em fase crônica e oito em fase acelerada. Pré-TCTH, alterações cromossômicas adicionais ao cromossomo Philadelphia (Ph) foram observadas em 11 pacientes. A mais freqüente foi o duplo Ph observado em quatro casos. Após o TCTH, quimerismo total foi observado em 31 pacientes (79,5 por cento). Desses, 23 (82,3 por cento) apresentavam somente o cromossomo Ph. Quimerismo misto foi observado em sete pacientes, sendo três com alterações adicionais ao Ph. Um caso não apresentou resposta ao TCTH. Recaída citogenética associada com recaída clínica foi observada em cinco pacientes. Após o TCTH, 27 pacientes permanecem vivos e com remissão clínica e citogenética. CONCLUSÃO: Em nosso estudo a presença de alterações cromossômicas adicionais ao Ph, prévias ao TCTH, não foi associada com pior evolução, com risco de recaída, bem como não foi observada diferença entre as taxas de sobrevida. Nosso estudo sugere que a citogenética clássica permanece uma grande ferramenta no monitoramento do TCTH.