Liquid biopsy for molecular characterization of diffuse large B-cell lymphoma and early assessment of minimal residual disease.

Circulating tumour DNA (ctDNA) allows genotyping and minimal residual disease (MRD) detection in lymphomas. Using a next-generation sequencing (NGS) approach (EuroClonality-NDC), we evaluated the clinical and prognostic value of ctDNA in a series of R-CHOP-treated diffuse large B-cell lymphoma (DLBCL) patients at baseline (n = 68) and after two cycles (n = 59), monitored by metabolic imaging (positron emission tomography combined with computed tomography [PET/CT]). A molecular marker was identified in 61/68 (90%) ctDNA samples at diagnosis. Pretreatment high ctDNA levels significantly correlated with elevated lactate dehydrogenase, advanced stage, high-risk International Prognostic Index and a trend to shorter 2-year progression-free survival (PFS). Valuable NGS data after two cycles of treatment were obtained in 44 cases, and 38 achieved major molecular response (MMR; 2.5-log drop in ctDNA). PFS curves displayed statistically significant differences among those achieving MMR versus those not achieving MMR (2-year PFS of 76% vs. 0%, p < 0.001). Similarly, more than 66% reduction in ΔSUVmax by PET/CT identified two subgroups with different prognosis (2-year PFS of 83% vs. 38%; p < 0.001). Combining both approaches MMR and ΔSUVmax reduction, a better stratification was observed (2-year PFS of 84% vs. 17% vs. 0%, p < 0.001). EuroClonality-NDC panel allows the detection of a molecular marker in the ctDNA in 90% of DLBCL. ctDNA reduction at two cycles and its combination with interim PET results improve patient prognosis stratification.

Single-point and kinetics of peripheral residual disease by mass spectrometry to predict outcome in patients with high risk smoldering multiple myeloma included in the GEM-CESAR trial.

The value of quantitative immunoprecipitation mass spectrometry (QIP-MS) to identify the M-protein is being investigated in patients with monoclonal gammopathies but no data are yet available in high-risk smoldering myeloma (HRsMM). We have therefore investigated QIP-MS to monitor peripheral residual disease (PRD) in 62 HRsMM patients enrolled in the GEM-CESAR trial. After 24 cycles of maintenance, detecting the M-protein by MS or clonal plasma cells by NGF identified cases with a significantly shorter median PFS (mPFS; MS: not reached vs 1,4 years, p=0.001; NGF: not reached vs 2 years, p=0.0002) but reaching CR+sCR did not discriminate patients with different outcome. With NGF as a reference, the combined results of NGF and MS showed a high negative predictive value (NPV) of MS: 81% overall and 73% at treatment completion. When sequential results were considered, sustained negativity by MS or NGF was associated with a very favorable outcome with a mPFS not yet reached vs 1.66 years and 2.18 years in cases never attaining PRD or minimal residual disease (MRD) negativity, respectively. We can thus conclude that 1) the standard response categories of the IMWG do not seem to be useful for treatment monitoring in HRsMM patients, 2) MS could be used as a non-invasive, clinical valuable tool with the capacity of guiding timely bone marrow evaluations (based on its high NPV with NGF as a reference) and 3) similarly to NGF, sequential results of MS are able identify a subgroup of HRsMM patients with long-term disease control. This study was registered at www.clinicaltrials.gov (ClinicalTrials.gov identifier: NCT02415413).

Health-related quality of life in patients with Waldenström macroglobulinemia: results from the ASPEN trial.

Aim ASPEN is a randomized, open-label, Phase III study comparing zanubrutinib and ibrutinib in patients with Waldenström macroglobulinemia (WM). Materials & methods: Patient-reported outcomes were exploratory end points assessed using the EORTC QLQ-C30 and EQ-5D-5L VAS scores. Results: Overall, 201 patients (102 zanubrutinib; 99 ibrutinib) were enrolled. Clinically meaningful differences were observed in diarrhea and nausea/vomiting in both the intent-to-treat population and in patients attaining very good partial response (VGPR) in earlier cycles of treatment, as well as in long-term physical functioning and fatigue in patients achieving VGPR. Conclusion: Treatment with zanubrutinib was associated with greater improvements in health-related quality of life compared with ibrutinib in patients with WM and MYD88 mutations.Clinical Trial Registration: NCT03053440 (ClinicalTrials.gov).

Patient quality of life is importantWhat is this article about? This article talks about a study called the ASPEN trial, which compares two medicines used for treating a rare blood cancer that doctors call Waldenström macroglobulinemia. The medicines are called zanubrutinib (ZAN) and ibrutinib (IBR). They work in the same way, by blocking a protein called Bruton tyrosine kinase. When patients take medicines for an illness, it is important to learn about their physical, social, emotional and mental well-being (quality of life). In this study, we asked patients to fill out questionnaires about their well-being before starting the study treatment for their blood cancer, and again a few times while taking the medication, to see if there were any changes.What were the results of the study? There were two groups of patients. One group took ZAN and the other took IBR. The patients could not choose which medicine they were going to take. Results from both groups of patients were compared. Patients taking ZAN did not feel worse or better about their diarrhea and sickness, but those taking IBR said these symptoms had become worse. Both medicines improved how patients were feeling. However, improvement in tiredness and physical ability was larger in patients taking ZAN than those on IBR, especially for the patients whose cancer was getting better.What do the results mean? For patients with a rare blood cancer in this study, those taking ZAN had a better quality of life than those taking IBR.

A research center's experience of T-cell-redirecting therapies in triple-class refractory multiple myeloma.

ABSTRACT: The efficacies of chimeric antigen receptor T cells (CAR-Ts) and bispecific monoclonal antibodies (BiAbs) for triple-class refractory (TCR) myeloma have not previously been compared, and clinical data on how to rescue patients after relapse from these immunotherapies are limited. A retrospective study of 73 TCR patients included in trials was conducted: 36 received CAR-Ts and 37 received BiAbs. CAR-Ts produced a higher overall response rate (ORR) than BiAbs (97.1% vs 56.8%, P = .002). After a median of follow-up of 18.7 months, no significant difference in progression-free survival (PFS) was observed between the CAR-T and BiAbs groups (16.6 vs 10.8 months; P = .090), whereas overall survival (OS) was significantly longer in the CAR-T than in the BiAbs group (49.2 vs 22.6 months; P = .021). BiAbs after CAR-Ts yielded a higher ORR and longer PFS2 than did nonredirecting T-cell therapies after CAR-Ts (ORR: 87.5% vs 50.0%; PFS2: 22.9 vs 12.4 months). By contrast, BiAbs after BiAbs resulted in an ORR of 33% and PFS2 of 8.4 months, which was similar to that produced by the nonredirecting T-cell therapies (ORR: 28.6%; PFS2: 8.1 months). Although this is a pooled analysis of different trials with different products and the patient profile is different for CAR-Ts and BiAbs, both were effective therapies for TCR myeloma. However, in our experience, although the PFS was similar with the 2 approaches, CAR-T therapy resulted in better OS, mainly because of the efficacy of BiAbs as rescue therapy. Our results highlight the importance of treatment sequence in real-word experience.

Brentuximab vedotin and chemotherapy in relapsed/refractory Hodgkin lymphoma: a propensity score-matched analysis.

ABSTRACT: Several single-arm studies have explored the inclusion of brentuximab vedotin (BV) in salvage chemotherapy followed by autologous stem cell transplantation (ASCT) for relapsed/refractory (R/R) classical Hodgkin lymphoma (cHL). However, no head-to-head comparisons with standard salvage chemotherapy have been performed. This study presents a propensity score-matched analysis encompassing individual patient data from 10 clinical trials to evaluate the impact of BV in transplant-eligible patients with R/R cHL. We included 768 patients, of whom 386 were treated with BV with or without chemotherapy (BV cohort), whereas 382 received chemotherapy alone (chemotherapy cohort). Propensity score matching resulted in balanced cohorts of 240 patients each. No significant differences were observed in pre-ASCT complete metabolic response (CMR) rates (P = .69) or progression free survival (PFS; P = .14) between the BV and chemotherapy cohorts. However, in the BV vs chemotherapy cohort, patients with relapsed disease had a significantly better 3-year PFS of 80% vs 70%, respectively (P = .02), whereas there was no difference for patients with primary refractory disease (56% vs 62%, respectively; P = .67). Patients with stage IV disease achieved a significantly better 3-year PFS in the BV cohort (P = .015). Post-ASCT PFS was comparable for patients achieving a CMR after BV monotherapy and those receiving BV followed by sequential chemotherapy (P = .24). Although 3-year overall survival was higher in the BV cohort (92% vs 80%, respectively; P < .001), this is likely attributed to the use of other novel therapies in later lines for patients experiencing progression, given that studies in the BV cohort were conducted more recently. In conclusion, BV with or without salvage chemotherapy appears to enhance PFS in patients with relapsed disease but not in those with primary refractory cHL.

Biomarker analysis of the ASPEN study comparing zanubrutinib with ibrutinib for patients with Waldenström macroglobulinemia.

ABSTRACT: The phase 3 ASPEN trial (NCT03053440) compared Bruton tyrosine kinase inhibitors (BTKis), zanubrutinib and ibrutinib, in patients with Waldenström macroglobulinemia (WM). Post-hoc biomarker analysis was performed using next-generation sequencing on pretreatment bone marrow samples from 98 patients treated with zanubrutinib and 92 patients treated with ibrutinib with mutated (MUT) MYD88 and 20 patients with wild-type (WT) MYD88 treated with zanubrutinib. Of 329 mutations in 52 genes, mutations in CXCR4 (25.7%), TP53 (24.8%), ARID1A (15.7%), and TERT (9.0%) were most common. TP53MUT, ARID1AMUT, and TERTMUT were associated with higher rates of CXCR4MUT (P < .05). Patients with CXCR4MUT (frameshift or nonsense [NS] mutations) had lower very good partial response (VGPR) and complete response rates (CR; 17.0% vs 37.2%, P = .020) and longer time to response (11.1 vs 8.4 months) than patients with CXCR4WT treated with BTKis. CXCR4NS was associated with inferior progression-free survival (PFS; hazard ratio [HR], 3.39; P = .017) in patients treated with ibrutinib but not in those treated with zanubrutinib (HR, 0.67; P = .598), but VGPR + CR rates were similar between treatment groups (14.3% vs 15.4%). Compared with ibrutinib, patients with CXCR4NS treated with zanubrutinib had a favorable major response rate (MRR; 85.7% vs 53.8%; P = .09) and PFS (HR, 0.30; P = .093). In patients with TP53MUT, significantly lower MRRs were observed for patients treated with ibrutinib (63.6% vs 85.7%; P = .04) but not for those treated with zanubrutinib (80.8% vs 81.9%; P = .978). In TP53MUT, compared with ibrutinib, patients treated with zanubrutinib had higher VGPR and CR (34.6% vs 13.6%; P < .05), numerically improved MRR (80.8% vs 63.6%; P = .11), and longer PFS (not reached vs 44.2 months; HR, 0.66; P = .37). Collectively, patients with WM with CXCR4MUT or TP53MUT had worse prognosis compared with patients with WT alleles, and zanubrutinib led to better clinical outcomes.

Single-Cell DNA Sequencing and Immunophenotypic Profiling to Track Clonal Evolution in an Acute Myeloid Leukemia Patient.

Single-cell DNA sequencing can address the sequence of somatic genetic events during myeloid transformation in relapsed acute myeloid leukemia (AML). We present an NPM1-mutated AML patient with an initial low ratio of FLT3-ITD (low-risk ELN-2017), treated with midostaurin combined with standard chemotherapy as front-line treatment, and with salvage therapy plus gilteritinib following allogenic stem cell transplantation after relapse. Simultaneous single-cell DNA sequencing and cell-surface immunophenotyping was used in diagnostic and relapse samples to understand the clinical scenario of this patient and to reconstruct the clonal composition of both tumors. Four independent clones were present before treatment: DNMT3A/DNMT3A/NPM1 (63.9%), DNMT3A/DNMT3A (13.9%), DNMT3A/DNMT3A/NPM1/FLT3 (13.8%), as well as a wild-type clone (8.3%), but only the minor clone with FLT3-ITD survived and expanded after therapy, being the most represented one (58.6%) at relapse. FLT3-ITD was subclonal and was found only in the myeloid blast population (CD38/CD117/CD123). Our study shows the usefulness of this approach to reveal the clonal architecture of the leukemia and the identification of small subclones at diagnosis and relapse that may explain how the neoplastic cells can escape from the activity of different treatments in a stepwise process that impedes the disease cure despite different stages of complete remission.

Impact of the COVID-19 pandemic on the diagnosis and treatment of onco-hematologic patients: a discussion paper / Impacto de la pandemia de COVID-19 en el diagnóstico y tratamiento de los pacientes onco-hematológicos: un documento de opinión

We do not know the precise figure for solid organ tumors diagnosed each year in Spain and it is therefore difficult to calculate whether there has been a decrease in cancer diagnoses as a consequence of the pandemic. Some indirect data suggest that the pandemic has worsened the stage at which some non-hematological neoplasms are diagnosed. Despite the lack of robust evidence, oncology patients seem more likely to have a poor outcome when they contract COVID-19. The antibody response to infection in cancer patients will be fundamentally conditioned by the type of neoplasia present, the treatment received and the time of its administration.In patients with hematological malignancies, the incidence of infection is probably similar or lower than in the general population, due to the better protective measures adopted by the patients and their environment. The severity and mortality of COVID-19 in patients with hematologic malignancies is clearly higher than the general population. Since the immune response to vaccination in hematologic patients is generally worse than in comparable populations, alternative methods of prevention must be established in these patients, as well as actions for earlier diagnosis and treatment.Campaigns for the early diagnosis of malignant neoplasms must be urgently resumed, post-COVID manifestations should be monitored, collaboration with patient associations is indisputable and it is urgent to draw the right conclusions to improve our preparedness to fight against possible future catastrophes. (AU)

No conocemos con precisión la cifra nacional de tumores sólidos diagnosticados en España anualmente y por tanto se hace difícil calcular si ha habido una disminución de diagnósticos de cáncer como consecuencia de la pandemia. Algunos datos indirectos permiten sospechar que la pandemia ha empeorado el estadio en que se diagnostican algunas neoplasias no hematológicas. A pesar de no existir una evidencia robusta, los pacientes oncológicos presentan una mayor tendencia a tener una mala evolución cuando contraen COVID-19. La respuesta de anticuerpos frente a la infección en pacientes con cáncer va a estar condicionada fundamentalmente por el tipo de neoplasia presente, el tratamiento recibido y el momento de su administración.En pacientes con hemopatías malignas la incidencia de infección es probablemente similar o inferior a la de la población general, debido a las mejores medidas de protección adoptadas por los pacientes y su entorno. La gravedad y letalidad de la COVID-19 en pacientes con hemopatías malignas es claramente más elevada que en la población general. Dado que la respuesta inmune a la vacunación es peor que en poblaciones comparables, hay que establecer métodos alternativos de prevención en estos pacientes, así como planes de diagnóstico y tratamiento precoces.Hay que retomar las campañas de diagnóstico precoz de neoplasias malignas con urgencia, vigilar las manifestaciones post-COVID, colaborar con las asociaciones de pacientes y hacer planes urgentes para hacer frente con más eficiencia a potenciales catástrofes futuras. (AU)

Estratificación, monitorización y control del riesgo cardiovascular en pacientes con cáncer. Documento de consenso de SEC, FEC, SEOM, SEOR, SEHH, SEMG, AEEMT, AEEC y AECC / Stratification and management of cardiovascular risk in cancer patients. A consensus document of the SEC, FEC, SEOM, SEOR, SEHH, SEMG, AEEMT, AEEC, and AECC

El incremento de la supervivencia del enfermo con cáncer, junto con el desarrollo de nuevas terapias antitumorales, han puesto de relieve el impacto negativo que las complicaciones vasculares asociadas con el tratamiento oncohematológico tienen en la salud cardiovascular del paciente con cáncer. El objetivo de este documento de consenso, promovido por el Grupo de Trabajo de Cardio-oncología de la Sociedad Española de Cardiología (SEC) y elaborado conjuntamente con diferentes áreas de conocimiento de la SEC junto con la Sociedad Española de Hematología y Hemoterapia (SEHH), la Sociedad Española de Oncología Médica (SEOM), la Sociedad Española de Oncología Radioterápica (SEOR), la Sociedad Española de Médicos Generales y de Familia (SEMG), la Asociación Española de Especialistas en Medicina del Trabajo (AEEMT), la Asociación Española de Enfermería Cardiovascular (AEEC), la Fundación Española del Corazón (FEC) y la Asociación Española contra el Cáncer (AECC), es proporcionar un enfoque coordinado, multidisciplinar y práctico para la estratificación, la monitorización y el tratamiento del riesgo cardiovascular de los pacientes con cáncer. (AU)

Both cancer treatment and survival have significantly improved, but these advances have highlighted the deleterious effects of vascular complications associated with anticancer therapy. This consensus document aims to provide a coordinated, multidisciplinary and practical approach to the stratification, monitoring and treatment of cardiovascular risk in cancer patients. The document is promoted by the Working Group on Cardio Oncology of the Spanish Society of Cardiology (SEC) and was drafted in collaboration with experts from distinct areas of expertise of the SEC and the Spanish Society of Hematology and Hemotherapy (SEHH), the Spanish Society of Medical Oncology (SEOM), the Spanish Society of Radiation Oncology (SEOR), the Spanish Society of General and Family Physicians (SEMG), the Spanish Association of Specialists in Occupational Medicine (AEEMT), the Spanish Association of Cardiovascular Nursing (AEEC), the Spanish Heart Foundation (FEC), and the Spanish Cancer Association (AECC). (AU)

Situación actual de la Cardio-Oncología en España: encuesta nacional multidisciplinaria / Current status of Cardio-Oncology in Spain: a national multidisciplinary survey

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Abordaje de la fibrilación auricular en pacientes con cáncer activo. Documento de consenso de expertos y recomendaciones / Atrial fibrillation in active cancer patients: expert position paper and recommendations

La mejora en la supervivencia de los pacientes con cáncer ha puesto de manifiesto el impacto clínico que la cardiotoxicidad tiene en el pronóstico tanto cardiovascular como onco-hematológico, sobre todo cuando motiva la interrupción de terapias antitumorales altamente eficaces. La fibrilación auricular es una complicación frecuente en pacientes con cáncer activo y su tratamiento supone un gran reto. Estos pacientes tienen mayores riesgos tromboembólico y hemorrágico y, sin embargo, no se dispone de escalas específicas para guiar la atención clínica. El objetivo de este documento promovido por los grupos de Cardio-Onco-Hematología y Trombosis de la Sociedad Española de Cardiología y elaborado de manera conjunta con las diferentes áreas de conocimiento de la Sociedad Española de Cardiología y con expertos de la Sociedad Española de Oncología Médica, la Sociedad Española de Oncología Radioterápica y la Sociedad Española de Hematología y Hemoterapia, es proporcionar un enfoque multidisciplinario y práctico para la prevención y el tratamiento de la fibrilación auricular de pacientes con cáncer activo y basado en el consenso de expertos

Improvements in survival among cancer patients have revealed the clinical impact of cardiotoxicity on both cardiovascular and hematological and oncological outcomes, especially when it leads to the interruption of highly effective antitumor therapies. Atrial fibrillation is a common complication in patients with active cancer and its treatment poses a major challenge. These patients have an increased thromboembolic and hemorrhagic risk but standard stroke prediction scores have not been validated in this population. The aim of this expert consensus-based document is to provide a multidisciplinary and practical approach to the prevention and treatment of atrial fibrillation in patients with active cancer. This is a position paper of the Spanish Cardio-Oncology working group and the Spanish Thrombosis working group, drafted in collaboration with experts from the Spanish Society of Cardiology, the Spanish Society of Medical Oncology, the Spanish Society of Radiation Oncology, and the Spanish Society of Hematology

Expert consensus on the integrated diagnosis of idiopathic multicentric Castleman disease / Consenso de expertos sobre el diagnóstico integrado de la enfermedad de Castleman idiopática multicéntrica

Idiopathic multicentric Castleman disease (iMCD) is rare. The differential diagnosis includes inflammatory, autoimmune and neoplastic disease. The identification of the histopathological features of Castleman disease in the lymph node is the main diagnostic criterion.Fifty-three experts from three medical societies (SEMI, SEHH and SEAP) have created a multi-disciplinary consensus document in order to standardise the diagnosis of Castleman disease. Using the Delphi method, specific recommendations for the initial clinical, laboratory and imaging studies have been made for an integrated diagnosis of iMCD as well as for the best way to obtain samples for histopathological confirmation, correct laboratory procedure and interpretation and reporting of results.(AU)

La enfermedad de Castleman multicéntrica idiopática (ECMi) es una patología infrecuente. El diagnóstico diferencial incluye patología inflamatoria, autoinmune y neoplásica. El estudio anatomopatológico del ganglio linfático y la identificación de las características histopatológicas de la enfermedad de Castleman constituyen un criterio principal para el diagnóstico.Con el objetivo de estandarizar el proceso diagnóstico de esta patología, se ha desarrollado un documento de consenso multidisciplinario con la participación de 53 expertos de tres sociedades médicas (Sociedad Española de Medicina Interna [SEMI], Sociedad Española de Hematología y Hemoterapia [SEHH] y Sociedad Española de Anatomía Patológica [SEAP]). Mediante el método Delphi se han validado las recomendaciones específicas para el diagnóstico integrado de la ECMi con respecto a los estudios clínicos, de laboratorio y de imagen necesarios en el abordaje inicial del paciente y las recomendaciones acerca de la mejor obtención de muestras para confirmación histopatológica, así como procedimientos de laboratorio para el estudio de las muestras, interpretación de resultados y emisión de un informe anatomopatológico.(AU)

Cardio-Onco-Hematología en la práctica clínica. Documento de consenso y recomendaciones / Cardio-Onco-Hematology in clinical practice. Position paper and recommendations

Los avances en la detección precoz y el tratamiento del cáncer han reducido de manera significativa la mortalidad de los pacientes. Sin embargo, mejorar el pronóstico no es solo curar el tumor, sino prevenir, diagnosticar y tratar eficazmente las complicaciones derivadas de las terapias onco-hematológicas. La toxicidad cardiovascular es un problema ampliamente reconocido con múltiples esquemas terapéuticos; sin embargo, la evidencia científica en el manejo de las complicaciones cardiovasculares de pacientes onco-hematológicos es escasa, pues sistemáticamente se ha excluido de los ensayos clínicos a estos enfermos y las recomendaciones actuales están basadas en consensos de expertos. Es imprescindible crear equipos multidisciplinarios locales para optimizar los resultados en salud de los supervivientes al cáncer. Una preocupación excesiva por la aparición de toxicidad cardiovascular puede impedir terapias potencialmente curativas, mientras que la subestimación de este riesgo compromete el pronóstico vital a largo plazo. El objetivo de este documento, elaborado en colaboración con la Sociedad Española de Cardiología, la Sociedad Española de Oncología Médica, la Sociedad Española de Oncología Radioterápica y la Sociedad Española de Hematología, es actualizar los conocimientos aplicables a la práctica clínica diaria de la cardio-onco-hematología y promover el desarrollo de equipos multidisciplinarios locales que mejoren la salud cardiovascular de los pacientes con cáncer (AU)

Improvements in early detection and treatment have markedly reduced cancer-related mortality. However survival not only depends on effectively cure cancer, but prevention, diagnosis and treatment of cancer-related complications is also needed. Cardiovascular toxicity is a widespread problem across many classes of therapeutic schemes, however scientific evidence in the management of cardiovascular complications of onco-hematological patients is scarce, as these patients have been systematically excluded from clinical trials and current recommendations are based on expert consensus. Multidisciplinary teams are mandatory to decrease morbidity and mortality from both cardiotoxicity and cancer itself. An excessive concern for the occurrence of cardiovascular toxicity, can avoid potentially curative therapies, while underestimating this risk, increases long-term mortality of cancer survivors. The objective of this consensus document, developed in collaboration of the Spanish Society of Cardiology, the Spanish Society of Medical Oncology, the Spanish Society of Radiation Oncology and the Spanish Society of Hematology, is to update the necessary concepts and expertise on cardio-onco-hematology that enable its application in daily clinical practice and to promote the development of local multidisciplinary teams, to improve the cardiovascular health of patients with cancer (AU)

Amiloidosis primaria / Primary amyloidosis

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Osteonecrosis maxilar asociada a bisfosfonatos / Bisphosphonate-associated jaw osteonecrosis

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Recommendations for the prevention, diagnosis, and treatment of osteonecrosis of the jaw (ONJ) in cancer patients treated with bisphosphonates

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Aplicaciones del test sérico de cadenas ligeras libres en las gammapatías monoclonales / Value of serum free light chains assay in plasma cell disorders

La identificación y la cuantificación del componente monoclonal en las gammapatías monoclonales se basa en la electroforesis, la inmunofijación (IFE) y la dosificación de inmunoglobulinas por nefelometría. La combinación de estas técnicas tiene alta sensibilidad, pero hay 2 entidades en las que esta metodología tiene dificultades de diagnóstico: el mieloma múltiple (MM) no secretor (u oligosecretor) y la amiloidosis primaria. Además, estas técnicas están sujetas a un cierto grado de subjetividad en la interpretación de los resultados, y la IFE no permite obtener resultados cuantitativos. En el seno de estas limitaciones se ha desarrollado un test que cuantifica las cadenas ligeras libres en suero y que ha supuesto un gran avance. Por ello, aparte de ser obligado su uso en la monitorización de la amiloidosis primaria y el MM no secretor (u oligosecretor), se recomienda en el cribado de gammapatías, en la evaluación pronóstica del MM y otras discrasias de células plasmáticas, y en los pacientes que alcanzan remisión completa (IFE negativa), puesto que la normalización de las cadenas ligeras libres define la llamada respuesta completa estricta, un estado que probablemente implica una respuesta de mayor calidad (AU)

The identification and quantification of the monoclonal immunoglobulin in Plasma Cell Disorders (PCD) is based on electrophoresis, immunofixation (IFE) and on immunoglobulins nephelometric measurement. Even though the combination of these techniques is highly sensitive, there are two entities which pose a diagnostic challenge: Non-secretory Multiple Myeloma (MM) and Amyloidosis (AL) patients. Furthermore, when it comes to the results, these techniques have a degree of subjective interpretation and the IFE does not provide quantitative results. Within these limitations a new assay capable of quantifying free light chains (FLC) in serum has been developed. This is a great improvement in PCD and its major indication is the diagnosis and monitoring of patients with AL and non-secretory MM. In addition, its use has been recommended in the screening of all gammopathies; in the prognostic evaluation of MM and other PCD; and the definition of the stringent complete response for patients who achieve a complete remission (CR) with negative IFE and a normalized FLC ratio (AU)

Utilización de bisfosfonatos en pacientes con mieloma múltiple: recomendaciones del comité de expertos del Grupo Español de Mieloma del Programa Español de Tratamientos en Hematología / Guidelines for the use of bisphosphonates in multiple myeloma: Recommendations of the expert committee of the Spanish Myeloma Group from the PETHEMA group

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