Myeloproliferative Neoplasm Symptom Assessment Form - Total Symptom Score (MPN-SAF TSS) questionnaire: translation, cultural adaptation and validation to Brazilian Portuguese

ABSTRACT Introduction: Constitutional symptoms and thrombohemorrhagic events are common in patients with myeloproliferative neoplasms (MPNs). Hence, the treatment's primary goal is to control symptoms and improve the quality of life (QoL). In order to assess response to therapy, symptom burden, and QoL among patients with MPN, the "Myeloproliferative Neoplasm Symptom Assessment Form - Total Symptom Score (MPN-SAF TSS)" questionnaire was developed in the USA in 2012. Herein, we translated and validated the MPN-SAF TSS questionnaire to Brazilian Portuguese. Methods: The ten-item questionnaire was translated from the English language and its psychometric properties (reliability, convergent and construct validities) were evaluated in 101 MPN patients. Results: There were 41 patients with essential thrombocythemia, 39 with myelofibrosis and 21 with polycythemia vera. The median age of all patients at diagnosis was 68 years and 59% were female. The Cronbach's alpha coefficient for the overall questionnaire was 0.78, ranging from 0.73 to 0.79, if each item was deleted. Validity analyses showed that the strongest item-item correlation were between early satiety and abdominal discomfort. Strong correlations were also found between physician and patient perceptions of itching (r = 0.81) and fatigue (r = 0.70). The Pearson coefficient correlation between the MPN-SAF TSS global score and the EORTC QLQ-C30 functional scales ranged from 0.51 to 0.64. The exploratory factor analysis showed that seven of the ten symptoms loaded into one single factor. Conclusion: The Brazilian Portuguese version of the MPN-SAF-TSS showed good psychometric properties and can be an available tool to assess symptom burden in this group of patients.

Estudio de mutaciones en neoplasias mieloproliferativas Philadelphia negativas en un hospital público chileno / Search for mutations in patients with Philadelphia negative myeloproliferative neoplasms in a public hospital in Chile

BACKGROUND: Philadelphia negative myeloproliferative neoplasms (Ph-MPN) are clonal disorders whose pathogenesis has been elucidated in recent years, creating diagnostic and prognostic algorithms. AIM: To study JAK2, CALR y MPL gene mutations in patients with Ph-MPN. MATERIALS AND METHODS: Descriptive cross-sectional observational study of patients with MPN (2015-2019), reviewing clinical, demographic and laboratory data. JAK2, CALR and MPL gene mutations were analyzed by RT-PCR. Results: We studied 72 patients. Fifty percent had essential thrombocythemia (ET), 26.4% had polycythemia vera (PV) and 23.6% had primary myelofibrosis (PM). Bone marrow biopsy was available in 76.5%. At diagnosis, the mean age was 65.5 years and 61% were symptomatic. A thrombotic event was the most frequent problem in 20% and 25% had splenomegaly. There were statistically significant differences in hematological parameters between the different MPNs. JAK2 V617F mutation was detected in 61.1%. Only 19 JAK2 V617F negative patients were available for CALR and MPL mutation studies, identifying 10 triple negative cases. Kaplan Meier curves showed a median survival of 88 months, being similar in the three MPNs. Causes of death in 20 patients were thrombotic complications in 30%, disease progression in 25%, infection in 20%, other neoplasms in 15% and other causes in 10%. CONCLUSIONS: The presentation and frequency of JAK2 V617F, CALR and MPL mutations in our cohort was similar to those reported in other studies for ET and PM. JAK2 V617F mutation was lower for PV. No significant differences between the three MPNs were observed for overall survival. We could not assess the prognostic value of the mutations.

Splanchnic vein thrombosis as a manifestation of latent myeloproliferative neoplasm associated with sticky platelet syndrome / Trombosis esplácnica como presentación de neoplasia mieloproliferativa latente asociada con síndrome de plaqueta pegajosa

Abstract Vein thrombosis of unusual sites such as the splanchnic region continues to be not only a diagnostic but also a therapeutic challenge for the clinician due to its manifestation and associated pathologies. Latent JAK2 (Janus kinase 2) positive myeloproliferative neoplasm associated with sticky platelet syndrome is unusual. We present a clinical case of a 38-year-old female patient who presented with sudden onset abdominal pain of a possible vascular origin. Splanchnic thrombosis was diagnosed in latent myeloproliferative neoplasm by identifying the JAK2V617F mutation and sticky platelet syndrome via platelet aggregometry. Off-label anticoagulation with rivaroxaban 20 mg/day was administered. During her outpatient follow-up, she did not suffer any new thrombotic episodes.

Resumen La trombosis venosa de sitios inusuales como la esplácnica continúa siendo un reto no solo diagnóstico sino también terapéutico para el clínico debido a su forma de presentación y las patologías asociadas. La neoplasia mieloproliferativa latente JAK2 (cinasa de Janus 2) positiva asociada con síndrome de plaqueta pegajosa es inusual. Se presenta un caso clínico de una paciente de 38 años de edad que debutó con dolor abdominal de inicio súbito que sugirió un posible origen vascular. Se diagnosticó trombosis esplácnica en relación con neoplasia mieloproliferativa latente por la identificación de la mutación de la JAK2V617F y síndrome de plaqueta pegajosa mediante agregometría plaquetaria. Se administró de manera off-label anticoagulación con rivaroxabán 20 mg/día. Durante su seguimiento ambulatorio no ha presentado nuevos episodios trombóticos.

Trastornos mieloproliferativos y leucemia en síndrome de Down. Presentación de dos casos clínicos en el período neonatal / Myeloproliferative disorders and leukemia related to Down syndrome. Report of two clinical cases in neonatal period

ElsíndromedeDownpredisponeatrastornosmieloproliferativos. Se estima que del 5 % al 30 % de los neonatos con esta condición desarrollarán mielopoyesis anormal transitoria. El tratamiento no está estandarizado; la exanguinotransfusión y la citarabina podrían ser efectivos. Se describen dos casos de pacientes con síndrome de Down, quienes durante el período neonatal presentaron leucemia mieloide aguda y mielopoyesis anormal transitoria, los tratamientos utilizados y sus desenlaces. Se considera que la sospecha y el diagnóstico temprano de esta entidad son factores determinantes en el pronóstico.

Down syndrome predisposes to haematological disorders. It is estimated that 5-30% of neonates with this condition will develop transient abnormal myelopoiesis. Treatment is not standardized; exchange transfusion and the use of cytarabine could be effective. We present two clinical cases of patients with Down syndrome, who during the neonatal period showed acute myeloid leukemia and transient abnormal myelopoiesis, the treatments used and their outcomes. Suspicion and early diagnosis of this entity are considered determining factors in prognosis.

Exploring redox vulnerabilities in JAK2V617F-positive cellular models

ABSTRACT Background: In Philadelphia chromosome-negative myeloproliferative neoplasm (MPN) models, reactive oxygen species (ROS) are elevated and have been implicated in genomic instability, JAK2/STAT signaling amplification, and disease progression. Although the potential effects of ROS on the MPN phenotype, the effects of ruxolitinib treatment on ROS regulation have been poorly explored. Herein, we have reported the impact of ruxolitinib on redox signaling transcriptional network, and the effects of diphenyleneiodonium (DPI), a pan NOX inhibitor, in JAK2V617F-driven cellular models. Method: Redox signaling-related genes were investigated in SET2 cells upon ruxolitinib treatment by RNA-seq (GEO accession GSE69827). SET2 and HEL cells, which represent JAK2V617F-positive MPN cellular models with distinct sensitivity to apoptosis induced by ruxolitinib, were used. Cell viability was evaluated by MTT, apoptosis by annexin V/PI and flow cytometry, and cell signaling by quantitative PCR and Western blot. Main results: Ruxolitinib impacted on a network composed of redox signaling-related genes, and DUOX1 and DUOX2 were identified as potential modulators of ruxolitinib response. In SET2 and HEL cells, DPI reduced cell viability and, at low doses, it significantly potentiated ruxolitinib-induced apoptosis. In the molecular scenario, DPI inhibited STAT3, STAT5 and S6 ribosomal protein phosphorylation and induced PARP1 cleavage in JAK2V617F-positive cells. DPI combined with ruxolitinib increased PARP1 cleavage in SET2 cells and potentiated ruxolitinib-reduced STAT3, STAT5 and S6 ribosomal protein in HEL cells. Conclusion: Our study reveals a potential adaptation mechanism for resistance against ruxolitinib by transcriptionally reprogramming redox signaling in JAK2V617F cells and exposes redox vulnerabilities with therapeutic value in MPN cellular models.

Guidelines for therapy of patients with chronic myeloproliferative neoplasms during the novel coronavirus SARS-CoV2 pandemic

ABSTRACT The novel coronavirus has swept across the world in 2020 and ushered a new era. In the current scenario, it is not clear how patients with myeloproliferative neoplasms (including chronic myelogenous leukemia) should be managed, considering the risk of therapy, the need for social distancing and the risk of untimely therapy discontinuation of delay. This guideline aims to give providers a sense of direction in order to better take care of patients and prioritize care.

Clinical and molecular profile of a Brazilian cohort of patients with classical BCR-ABL1-negative myeloproliferative neoplasms

ABSTRACT Background: The classical BCR-ABL1-negative myeloproliferative neoplasms (MPNs) are Polycythemia Vera (PV), Essential Thrombocythemia (ET) and Primary Myelofibrosis (PMF). In developing countries, there are few reports that truly reveal the clinical setting of these patients. Therefore, we aimed to characterize a single center MPN population with a special focus on the correct diagnosis based on the recent review of the WHO criteria for the diagnosis of myeloid neoplasms. Methods: This retrospective study analyzed data from medical records of patients with classical BCR-ABL1-negative MPNs diagnosed from January 1997 to October 2017 and followed at the University Hospital of Ribeirão Preto Medical School. Results: A total of 162 patients were assessed, 61 with PV, 50 with ET, and 51 with PMF. The mutational status analysis revealed that 113 (69.3%) harbored the JAK2V617F mutation, 23 (14.1%), the CALR mutation, and 12 (7.4%) had a triple-negative status. None of the patients were found to have mutations on the thrombopoietin receptor gene (MPL), including some ET and PMF patients who were not tested. Among the PV patients, 57 (93.5%) were positive for the JAK2V617F mutation, one (1.6%) presented an in-frame deletion JAK2 exon 12 mutation and one (1.6%) presented a missense JAK2 exon 9 mutation, not previously described. The overall survival was lower in the triple-negative patients with PMF, when compared to the JAK2V617F or CALR-mutated (p= 0.002). Conclusion: The frequency of somatic mutations and survival in our cohort, stratified according to the respective disease, was consistent with the literature data, despite some limitations. Further prospective epidemiological studies of MPN cohorts are encouraged in developing countries.

Utilidad diagnóstica de la biopsia de médula ósea en pediatría / Diagnostic utility of biopsy of bone marrow in Pediatry

La biopsia de médula ósea (BMO) es un procedimiento invasivo que ha ganado campo en la práctica médica ya que se realiza para el diagnóstico, estadificación y seguimiento de enfermedades hematológicas y no hematológicas, benignas o neoplásicas, entre otros. El objetivo fue establecer el rol de la BMO en las hemopatías en Pediatría en el ION SOLCA Guayaquil- Ecuador. Se utilizó un estudio descriptivo retrospectivo donde se incluyeron a todos los pacientes pediátricos menores de 18 años de edad que se sometieron a BMO, desde Julio de 2014 a Julio de 2017 en el hospital. De las 1511 BMO realizadas en el periodo de estudio, 869 correspondieron a biopsias pediátricas, de las cuales el 57,08% fueron varones. La edad mediana fue 5 (RIC: 3-10) años. El tamaño promedio de la BMO fue de 0,74 (0,1-2,5) cm, con una celularidad media de 20% (4-100%). El motivo de consulta más frecuente fue la fiebre (22,67%). En el hemograma se detectó más frecuentemente bicitopenia (44,65%) y pancitopenia (24,63%). La Leucemia Linfoblástica Aguda (LLA) fue la enfermedad hematológica maligna más comúnmente encontrada (19,59%). Solo un 0,12% correspondió al grupo de Síndromes Mielodisplásicos (SMD), mientras que un 0,23% fueron Neoplasias Mieloproliferativas (NMP). El 26,93% de las biopsias no fueron aptas para el diagnóstico, el 48,45% se encontraron libres de enfermedad de base. La enfermedad oncohematológica pediátrica más frecuente es la LLA, mientras que los SMD y las NMP son infrecuentes. El rol del patólogo y de la BMO es fundamental en el diagnóstico de las enfermedades hematológicas, siempre en integración con la clínica y los exámenes complementarios.

Bone marrow biopsy (BMB) is an invasive procedure that has gained ground in medical practice since it is performed for the diagnosis, staging and monitoring of hematological and non-hematological, benign or neoplastic diseases, among others. This work aims to establish the role of the BMB in hematological diseases in Pediatrics in the ION SOLCA Guayaquil ­ Ecuador. A non-experimental design study, descriptive type was used, that included all pediatric patients under 18 years of age who submitted a BMB, from July 2014 to July 2017 in the hospital. Of the 1511 BMB performed in the study period, 869 corresponded to pediatric biopsies, of which 57.08% belong to male patients. The median age was 5 (interquartile range: 3 - 10) years. The average size of the BMB was 0.74 (0.1 - 2.5) cm, with an average cellularity of 20% (4 - 100%). The most frequent reason for consultation was fever (22.67%). In the complete blood count, bicytopenia (44.65%) and pancytopenia (24.63%) were detected most commonly. Acute Lymphoblastic Leukemia (ALL) was the most frequent malignant hematologic disease (19.59%). Only 0.12% corresponded to the group of Myelodysplastic Syndromes (MDS), while 0.23% were Myeloproliferative Neoplasms (MPN). 26.93% of the biopsies were not apt for diagnosis, 48.45% were free of base disease. The most cfrequent pediatric onco-hematologic disease is ALL, while MDS and MPN are infrequent. The role of the pathologist and the BMP is fundamental in the diagnosis of hematological diseases, always in integration with the clinic and complementary examinations.

Características otorrinolaringológicas en niños con trisomía 21: un estudio de 171 pacientes en el Hospital Infantil de México Federico Gómez / Otolaryngological features in children with trisomy 21: a study of 171 patients at the Hospital Infantil de México Federico Gómez

Resumen Introducción: Los niños con trisomía 21 enfrentan una amplia gama de problemas en la región de la cabeza y el cuello, por lo cual es importante reconocer las manifestaciones otorrinolaringológicas que presentan, así como su apropiado manejo. Métodos: Estudio de serie de casos retrospectivo de pacientes pediátricos con trisomía 21. De cada caso se analizó el espectro de manifestaciones otorrinolaringológicas, el manejo establecido y los resultados. Resultados: Se incluyeron 171 niños. La edad media de la primera valoración por otorrinolaringología en la institución fue de 7.2 ± 4.2 años. Las manifestaciones otológicas más frecuentes fueron la estenosis del conducto auditivo externo y la disfunción de la trompa de Eustaquio. Más de la mitad de los pacientes (63 %) presentaron hipoacusia, principalmente de tipo conductivo bilateral, y hasta el 75 % de los pacientes con afectación otológica requirieron algún procedimiento quirúrgico. Las manifestaciones rinológicas más comunes fueron la rinosinusitis crónica y la rinitis alérgica. La apnea obstructiva del sueño estuvo presente en el 30% de los pacientes. El tratamiento principal fue la amigdalectomía, seguida del tratamiento con dispositivos de presión positiva de la vía aérea. Menos del 5 % de los pacientes presentaron un compromiso laríngeo. Conclusiones: Los pacientes pediátricos con trisomía 21 deben ser remitidos sistemáticamente a una evaluación otorrinolaringológica periódica, debido a la alta incidencia de manifestaciones en esta región. Se deben ofrecer tratamientos oportunos para mejorar su salud y calidad de vida.

Abstract Introduction: Children with trisomy 21 face a wide range of conditions in the head and neck region, for which it is important that physicians are aware and have a strong understanding of the ear, nose, and throat (ENT) disorders, and their management as well. Methods: Retrospective case series of pediatric patients with trisomy 21. The spectrum of otolaryngological manifestations, their management, and outcomes of each case were analysed. Results: One hundred and seventeen pediatric patients were included. The mean age was 7.2 ± 4.2 years. More than half of the patients (63 %) had hearing loss (HL). The most frequent presentation was conductive HL, predominating the mild and bilateral type. The most common otological manifestations found were external ear canal stenosis and Eustachian tube dysfunction. Up to 75 % of the patients with otologic involvement required some surgical procedure. The most common rhinological manifestations were chronic rhinosinusitis and allergic rhinitis. Obstructive sleep apnea (OSA) was present in 30% of all patients, which main treatment was tonsillectomy, followed by continuous positive and biphasic positive airway pressure treatments. Less than 5 % of the patients presented a laryngeal compromise. Conclusions: Pediatric patients with trisomy 21 systematically should be referred to periodic ENT assessment due to the high incidence of manifestations in this region. Timely treatments should be offered in order to improve the health and the quality of life of the patient.

Estandarización de la técnica Real Time PCR para la detección molecular de la mutación V617F en el gen de JAK-2 en neoplasias mieloproliferativas crónicas / Standardization of the Real Time PCR technique for the molecular detection of the V617F mutation in the JAK-2 gene in chronic myeloproliferative neoplasms

V617F mutation in exon 14 of Janus Kinase 2 gene (jak-2) is used as a molecular marker for the diagnosis of Philadelphia negative myeloproliferative neoplasms (Phi-) such as Polycythemia Vera (PV), Essential Thrombocythemia (ET) and Primary Myelofibrosis (MFP). To detect this mutation, we used conventional polymerase chain reaction technique (PCR), a simple and inexpensive technique, however, has some drawbacks that current technology allows to solve. During the last years, more sensitive molecular techniques have been incorporated in clinical practice to support the diagnosis, prognosis and follow-up of hematological patients. For its implementation in the clinical routine should be considered technical and economic aspects, so in this work, we evaluate the Real Time PCR technique as a diagnostic method for the detection of the Jak-2-V617F mutation, using in house primers design. Our result show that the technique implemented has a concordance index of 0.87 with the conventional PCR used in the molecular diagnosis of myeloproliferative neoplasms. In addition, it has the same specificity, greater sensitivity and, shorter execution time in relation to conventional PCR. The implementation of this diagnostic method in our Hospital is technically possible and commercially convenient. (AU)

Pre-analytical parameters associated with unsuccessful karyotyping in myeloid neoplasm: a study of 421 samples

Cytogenetics is essential in myeloid neoplasms (MN) and pre-analytical variables are important for karyotyping. We assessed the relationship between pre-analytical variables (time from collection to sample processing, material type, sample cellularity, and diagnosis) and failures of karyotyping. Bone marrow (BM, n=352) and peripheral blood (PB, n=69) samples were analyzed from acute myeloid leukemia (n=113), myelodysplastic syndromes (n=73), myelodysplastic syndromes/myeloproliferative neoplasms (n=17), myeloproliferative neoplasms (n=137), and other with conclusive diagnosis (n=6), and reactive disorders/no conclusive diagnosis (n=75). The rate of unsuccessful karyotyping was 18.5% and was associated with the use of PB and a low number of nucleated cells (≤7×103/µL) in the sample. High and low cellularity in BM and high and low cellularity in PB samples showed no metaphases in 3.9, 39.7, 41.9, and 84.6% of cases, respectively. Collecting a good BM sample is the key for the success of karyotyping in MN and avoids the use of expensive molecular techniques.

Philadelphia-negative myeloproliferative neoplasms as disorders marked by cytokine modulation

ABSTRACT Background: Cytokines are key immune mediators in physiological and disease processes, whose increased levels have been associated with the physiopathology of hematopoietic malignancies, such as myeloproliferative neoplasms. Methods: This study examined the plasma cytokine profiles of patients with essential thrombocythemia, primary myelofibrosis, polycythemia vera and of healthy subjects, and analyzed correlations with JAK2 V617F status and clinical-hematological parameters. Results: The proinflammatory cytokine levels were increased in myeloproliferative neoplasm patients, and the presence of the JAK2 V617F mutation was associated with high IP-10 levels in primary myelofibrosis patients. Conclusions: Essential thrombocythemia, primary myelofibrosis, and polycythemia vera patients exhibited different patterns of cytokine production, as revealed by cytokine network correlations. Together, these findings suggest that augmented cytokine levels are associated with the physiopathology of myeloproliferative neoplasms.

Caracterización y síntomas de pacientes colombianos con neoplasias mieloproliferativas crónicas / Characterization and Symptoms of Patients in Colombia with Chronic Myeloproliferative Neoplasm / Caracterização e sintomas de pacientes colombianos com neoplasias mieloproliferativas

Resumen Objetivo: describir las características sociodemográflcas y los síntomas en pacientes colombianos con neoplasias mieloproliferativas crónicas. Métodos: los autores utilizaron la información contenida en el ejercicio de validación de la escala de síntomas MPN-SAF TSS -myeloproliferative neoplasm symptom assessment form total symptom score-, la cual, a través de una metodología de encuesta en 62 pacientes diagnosticados con estas neoplasias a nivel nacional, aportó el insumo de análisis para alcanzar el objetivo de este estudio. Resultados: dentro de las características sociodemográflcas, la variable edad concentró el 59% de los pacientes incluidos en el estudio por encima de los 60 años con una media de 58,8 (DS 15,53). Se identifica una mayor frecuencia y severidad de los síntomas en pacientes con diagnóstico de policitemia vera, seguido de trombocitemia esencial y, por último, en pacientes con diagnóstico de mielofibrosis. La "fatiga" se manifestó en el 98,3% de los pacientes, siendo el principal síntoma registrado en la escala utilizada en este estudio. Conclusión: los pacientes en estudio presentaron una edad promedio de 59 años con una mayor proporción de mujeres (58%) y una escolaridad baja (40%). El total de síntomas referidos en la escala se presentaron en más del 70% de los pacientes, siendo los más frecuentes fatiga, saciedad temprana y problemas de concentración.

Abstract Objective: To describe the sociodemographic characteristics and symptoms in Colombian patients with chronic myeloproliferative neoplasms. Methods: The authors used the information contained in the validation exercise symptom scale MPN-SAF TSS -myeloproliferative neoplasm symptom assessment form the total symptom score-, which, through a survey methodology in 62 patients diagnosed with these malignancies level in Colombia, provided the input analysis to achieve the objective of this study. Results: Among the socio-demographic characteristics, the age variable accounted for 59% of the patients included in the study over 60 years, with a mean of 58.8 (SD 15.53). Increased frequency and severity of symptoms in patients diagnosed with polycythemia vera were identified, followed by essential thrombocythemia and finally in patients diagnosed with myelofibrosis. "Fatigue" was expressed in 98% of patients to be the main symptom registered on the scale used in this study. Conclusion: The patients in the study had a mean age of 59 years with a higher proportion of women by 58% and a low level of schooling of 40%. The total number of symptoms referred to in the scale occurred in more than 70% of the patients, being the most frequent fatigue, early satiety and concentration problems.

Resumo Objetivo: descrever as características sócio demográficas e os sintomas em pacientes colombianos com neoplasia mieloproliferativa crónica. Métodos: os autores utilizaram a informação contida no exercício de validação da escala de sintomas MPN-SAF TSS -myeloproliferative neoplasm symptom assessment form total symptom score-, a qual, através de uma metodologia de questionário em 62 pacientes diagnosticados com estas neoplasias a nível país, aportaram o insumo de análise para alcançar o objetivo deste estudo. Resultados: dentro das características sócio demográficas, a variável idade concentrou o 59% dos pacientes incluídos no estudo por cima dos 60 anos com uma média de 58,8 (DS 15,53); se identifica uma maior frequência e severidade dos sintomas, em pacientes com diagnóstico de policitemia vera, seguido de trombocitemia essencial e por último em pacientes com diagnósticos de mielofibrose. A "fatiga" se manifestou no 98,3% dos pacientes sendo o principal sintoma registrado na escala utilizada neste estudo. Conclusão: os pacientes em estudo apresentaram uma idade média de 59 anos com uma maior proporção de mulheres 58% e uma escolaridade baixa do 40; o total de sintomas referidos na escala se apresentaram em mais do 70% dos pacientes, sendo os mais frequentes a fatiga, saciedade precoce e problemas de concentração.

Descripción de las caracteristicas clínicas de las neoplasias mieloproliferativas crónicas (NMPC). Primer informe del registro colombiano de NMPC / Description of the clinical characteristics of chronic myeloproliferative neoplasms (MPNs). First report of the colombian registry of MPNs

Resumen Introducción y objetivos: las neoplasias mieloproliferativas crónicas (NMPC) son relativamente raras, con incidencias que varían entre 0.47-1.03/100 000 habitantes. Se presenta el primer informe del trabajo del registro colombiano de NMPC, cuyo objetivo es describir las características clínicas de estos pacientes en nuestro país. Material y métodos: estudio descriptivo observacional, multicéntrico, retrospectivo y prospectivo en ocho centros del país, de abril de 2013 a diciembre de 2014. Las variables cualitativas se presentan con frecuencias absolutas y relativas; y las cuantitativas se resumen en medidas de tendencia central y dispersión. Resultados: once centros fueron aprobados, ocho ingresaron pacientes. En los primeros 179 casos reportados, 50% eran hombres, la edad promedio al diagnóstico 58.7 años (rango 19-92). Noventa y tres muestran trombocitemia esencial (TE); 55, policitemia vera (PV); y 31, mielofibrosis (MF). El 41% tenía esplenomegalia al diagnóstico; el 20% tuvo complicaciones trombóticas; y 12.85%, sangrado. Sólo en 57.5% se realizó JAK; de ellos, en 53.5% fue positivo, en especial sólo 60% de las PV. El 8% de los casos no tenía estudio de médula ósea, el 29.3% tiene algún grado de fibrosis. El hallazgo más frecuente fue hiperplasia megacariocítica en 59.78%. Más de 50% de pacientes estaban sintomáticos al diagnóstico. Sólo el 11% no recibió tratamiento farmacológico; los más frecuentes fueron hidroxiurea en 149 casos y ASA en 79. Con promedio de seguimiento de 52.6 meses; el 97.21% de los pacientes están vivos. Conclusiones: los hallazgos sugieren que algunas características de las NMPC podrían ser diferentes a lo reportado en otras series, lo que valida la importancia del esfuerzo de recoger información local.

Abstract Introduction and objectives: chronic MPNs are relatively rare, with incidences varying between 0.47-1.03 / 100 000 inhabitants. The first report of the work of the Colombian registry of chronic MPNs, whose objective is to describe the clinical characteristics of these patients in our country, is presented. Materials and methods: descriptive observational, multicenter, retrospective and prospective study in eight centers of the country, from April 2013 to December 2014. Qualitative variables are presented with absolute and relative frequencies, and the quantitative ones are summarized in measures of central tendency and dispersion. Results: eleven centers were approved; 8 admitted patients. In the first 179 cases reported, 50% were men; the average age at diagnosis was 58.7 years (range 19-92). Ninety-three present essential thrombocythemia (ET); 55, polycythemia vera (PV); and 31, myelofibrosis (MF). 41% had splenomegaly at diagnosis; 20% had thrombotic complications, and 12.85%, bleeding. JAK was performed in only 57.5%. Of them, in 53.5% was positive, especially in only 60% of the PV. 8% of the cases had no bone marrow study; 29.3% had some degree of fibrosis. The most frequent finding was megakaryocytic hyperplasia in 59.78%. More than 50% of patients were symptomatic at diagnosis. Only 11% did not receive pharmacological treatment, being the most frequent hydroxyurea in 149 cases and ASA in 79, with an average follow-up of 52.6 months. 97.21% of patients are alive. Conclusions: the findings suggest that some characteristics of chronic MPNs could be different from those reported in other series, which validates the importance of the effort to collect local information.

Supervivencia a largo plazo de pacientes con síndromes mieloproliferativos crónicos filadelfia negativos y su relación con variables clínico-patológicas

RESUMEN: Los sindromes mieloproliferativos crónicos (SMP) Filadelfia negativosclásicos incluyen tres neoplasias hematológicas caracterizadas por exceso deproliferación de progenitores del linaje mieloide: policitemia vera (PV),trombocitemia esencial (TE) y mielofibrosis primaria (MFP).En el presente estudio multicéntrico y prospectivo se incluyeron 102pacientes con diagnóstico de SMP con el objetivo de estudiar variables clínicas ypatológicas asociadas con supervivencia a largo plazo. Al momento de la inclusiónse estudió la presencia de la mutación V617F del gen JAK2 y otras mutaciones delgen JAK2. En una mediana de seguimiento de 11,5 años, se registraron eventostrombóticos, hemorrágicos, progresión hematológica y otros tumores primarios.Los resultados obtenidos demostraron que los pacientes positivos para lamutación JAK2V617F tuvieron mayor edad, mayor prevalencia de hipertensiónarterial, mayor valor de glóbulos blancos y fosfatasa alcalina leucocitaria. Lamutación se asoció a mayor riesgo de trombosis y ello se trasladó a unasupervivencia libre de eventos trombóticos inferior para los pacientes JAK2V617Fpositivos. La incidencia de transformación fibrótica a 10 años para los pacientes conPV y TE fue de 5,9%. La incidencia de progresión a mielodisplasia y leucemia agudapara todos los pacientes fue de 2,5% a 10 años. Para todos los pacientes la edadmayor o igual a 60 años se asoció a inferior supervivencia global y en pacientes conPV también la trombosis arterial. Se demostró que las causas de muerte de estospacientes no sólo estuvieron relacionadas a la progresión de la malignidad primariasino también a causas no malignas (eventos cardiovasculares) o malignidadessecundarias no hematológicas.En conclusión, los SMP Filadelfia negativos son patologías complejas deevolución variable. Los datos obtenidos en este trabajo y las asociacionesencontradas permitirán mejorar las estrategias de seguimiento y tratamiento deestos pacientes.

SUMMARY: Philadelphia chromosome-negative chronic myeloproliferative neoplasms(MPN) are hematological malignancies characterized by excessive proliferation ofmyeloid progenitor cells. The three classical entities are: polycythemia vera (PV),essential thrombocythemia (ET) and primary mielofibrosis (PMF).In this multicenter and prospective study 102 patients with diagnosis ofclassical MPN were included. The purpose of this study was to analyze the impact ofclinical and pathological variable on long-term survival. At inclusion, JAK2V617F andothers JAK2 mutations were studied in all patients. In a median of follow-up of 11.5years, vascular events, hematological progression and others primary tumors wereregistered.The results showed that JAK2V617F mutation positive patients were olderand had a higher rate of arterial hypertension, white cell counts, and alkalinephosphatase score. JAK2V61F was associated with a higher risk of thrombosis and alower thrombotic event free survival. The 10-year cumulative incidence of fibrotictransformation for patients with PV and ET was 5.9% and the 10-year cumulativeincidence of myelodysplasia and leukemia transformation was 2.5%. For all patients,age equal or more than 60 years old was associated with inferior overall survival; inpatients with PV also the arterial thrombosis affected the overall survival. Causes ofdeath of this cohort were related not only to the progression of hematologicalmalignancy but also to vascular events and others primary tumors.In conclusion MPN are complex diseases with variable clinical outcome. Thepresent study offers important insights about the natural history of this group ofmalignancies and provides information for developing treatment and follow-upstrategies.

Validación de la escala abreviada de síntomas en pacientes con neoplasias mieloproliferativas (MPN-SAF-TSS): evaluación en pacientes colombianos / Validation of the Abbreviated Symptom Scale for Patients with Myeloproliferative Neoplasm (MPN-SAF-TSS): Evaluation for Colombian Patients / Validação da Escala Abreviada de Sintomas em Pacientes com Neoplasias Mieloproliferativas (MPN-SAF-TSS): Avaliação em Pacientes Colombianos

Resumen Objetivo: Validar en Colombia la escala abreviada de síntomas representativos de neoplasias mieloproliferativas para su posterior uso en investigación y aplicación en el ámbito clínico. Materiales y métodos: Se realizó la adaptación transcultural de la escala MPN-SAF-TSS (por sus siglas en inglés: Mieloproliferative Neoplasm Symptom Assesment Form-Total Sympton Score) a español y al contexto colombiano, con análisis estadísticos de validez y confiabilidad con un tamaño de muestra determinado para cada propiedad psicométrica. Resultados: Con base en las propiedades psicométricas se logró verificar la confiabilidad y la estructura interna de la escala con alfa de Cronbach de 0,8552, lo que denota una buena consistencia interna; se obtuvo un coeficiente de correlación de concordancia de Lin de 0,765 que muestra una buena confiabilidad. El análisis factorial mostró múltiples valores de coeficiente de correlación por encima de 0,3, lo que indica que las variables de la escala miden factores comunes; la validez de criterio concurrente determina que la escala mide lo que debe medir con un adecuado coeficiente de correlación de Spearman de -0,71 y -0,73 al confrontarla con las escalas FACIT-Fatigue y Fact-Lym respectivamente. Conclusión: La escala MPN-SAF-TSS adaptada a español y al contexto colombiano es un instrumento válido para la evaluación de síntomas en pacientes con neoplasias mieloproliferativas y puede ser utilizado en la práctica clínica o en estudios clínicos por sus adecuadas propiedades psicométricas.

Abstract Objective: To validate in Colombia the abbreviated scale of representative symptoms of myeloproliferative neoplasms, for further use in research and for application in the clinical setting. Materials and methods: A cross-cultural adaptation of the MPN-SAF TSS-scale (mieloproliferative neoplasm symptom assessment form total symptom score) to Colombian Spanish using statistical validity and reliability analysis with a specific sample size for each psychometric property. Results. Based on the psychometric properties, the verification of reliability and internal structure with a Cronbach's alpha scale of 0.8552 was achieved, denoting good internal consistency. A Lin's concordance correlation coefficient of 0.765 was obtained, showing good reliability; factor analysis showed multiple correlation coefficient values above 0.3, indicating that the scale variables measure common factors. Concurrent validity determines that the scale measures what it should measure with an adequate Spearman correlation coefficient of -0.71 and -0.73 when confronted with the FACIT-Fatigue and Fact-Lym scales, respectively. Conclusion: The MPN-SAF-TSS scale adapted to Colombian Spanish is a valid assessment instrument for symptoms in patients with myeloproliferative neoplasms and can be used in clinical practice or trials due to its adequate psychometric properties.

Resumo Objetivo: Validar na Colômbia, a escala abreviada de sintomas representativos de neoplasias mielo-proliferativas, para u seu posterior uso em investigação e a sua aplicação no âmbito clínico. Materiais e métodos: Realizou-se a adaptação transcultural da escala MPN-SAF-TSS (pelas suas siglas em inglês mieloproliferative neoplasm symptom assesment form total sympton score) ao espanhol colombiano, com análises estadísticas de validez e confiabilidade com um tamanho de amostra determinado para cada propriedade psicométrica. Resultados: Com base nas propriedades psicomé-tricas conseguiu-se verificar a confiabilidade e a estrutura interna da escala com alfa de Cronbach de 0,8552, o que denota uma boa consistência interna; se obteve um coeficiente de correlação de concordância de Lin de 0,765 mostrando uma boa confiabilidade; a análise fatorial mostrou múltiplos valores de coeficiente de correlação por acima de 0.3 indicando que as variáveis da escala medem fatores comuns, a validez de critério concorrente determina que a escala mede o que deve medir, com um adequado coeficiente de correlação de Spearman de -0,71 e -0,73 ao confrontá-la com as escalas FACIT-Fatigue e Fact-Lym respectivamente. Conclusão: A escala MPN-SAF TSS adaptada ao espanhol colombiano, é um instrumento válido para a avaliação de sintomas em pacientes com neoplasias mieloproliferativas e pode ser utilizado na prática clínica ou em estudos clínicos pelas suas adequadas propriedades psicométricas.