¿Qué hay de nuevo en el tratamiento de amiloidosis por cadenas livianas? Parte 1: cadenas livianas / What is new in light chain amyloidosis treatment? Part 1: lightweight chains

La amiloidosis AL es una enfermedad debida al depósito, en órganos y tejidos, de fibrillas formadas por cadenas livianas producidas de forma patológica por plasmocitos clonales. Su tratamiento actualmente está orientado a erradicar el clon de células plasmáticas; este históricamente se extrapoló de tratamientos disponibles y estudiados para otras discrasias sanguíneas. En el año 2020, el Grupo de Estudio de Amiloidosis (GEA) confeccionó distintas guías de práctica clínica para el tratamiento de la amiloidosis AL. Desde entonces se han publicado ensayos clínicos que arrojan contundencia al conocimiento disponible hasta el momento, y están en desarrollo nuevas líneas de investigación que robustecen y estimulan el estudio en el área. En esta revisión se realiza una actualización de las guías existentes en lo que respecta al tratamiento de la amiloidosis por cadenas livianas.Como evidencia de relevancia, en el último año estuvieron disponibles resultados de ensayos clínicos que respaldan el uso de esquemas basados en daratumumab (un anticuerpo monoclonal anti-CD38+) para pacientes con diagnóstico reciente de amiloidosis AL como primera línea. Además, para el tratamiento de la amiloidosis AL refractaria o recaída, la disponibilidad de bibliografía respaldatoria es escasa y extrapolada del tratamiento del mieloma múltiple; sin embargo, actualmente existe evidencia de calidad para recomendar el uso de ixazomib, un inhibidor de proteosoma reversible por vía oral disponible en la Argentina desde 2020. Por último, se mencionan algunas líneas de investigación con otros anticuerpos monoclonales y terapéuticas basadas en el uso de CAR-T cells. (AU)

AL amyloidosis is a disease caused by the deposit in different organs and tissues of protein fibrils formed by light chains synthetized by pathological clonal plasma cells. Its treatment is currently aimed at eradicating this plasma cell clone and it has been historically extrapolated from available and validated treatments for other blood dyscrasias. In 2020, the Amyloidosis Study Group prepared different clinical practice guidelines for the treatment of AL amyloidosis.Since then, clinical trials have been published that confirm and strengthen the knowledge available up to now, and new lines of research are being developed that stimulate study in the area. In this review, an update of the existing guidelines regarding the treatment of AL amyloidosis is made. As relevant evidence, in the last year, results of clinical trials have been made available that support the use of regimens based on Daratumumab (an anti-CD38+ monoclonal antibody) for patients with newly diagnosed AL amyloidosis as first line therapy. In addition, for the treatment of refractory or relapsed AL amyloidosis, where the availability of supporting literature is scant and extrapolated from the treatment of multiple myeloma, there is currently quality evidence to recommend the use of ixazomib, an oral reversible proteasome inhibitor, only available in Argentina since 2020. Finally, some research lines exploring the efficacy of other monoclonal antibodies and therapeutic experiments based on the use of CAR-T cells are mentioned. (AU)

Amiloidose nodular - relato de rara apresentação da amiloidose localizada cutânea / Nodular amyloidosis - report of a rare presentation of cutaneous localized amyloidosis

Contexto: Amiloidose é um grupo de doenças caracterizadas pelo depósito de proteínas fibrilares, denominadas substância amiloide. Podem ser divididas em formas localizadas ou sistêmicas, sendo que dentre as localizadas, a forma nodular é a mais rara. Descrição do caso: Relatamos o caso de amiloidose primária localizada cutânea nodular que se apresentou com nódulos violáceos no dorso, e placas acastanhadas na região cervical há 8 anos sem evidências de envolvimento sistêmico. Discussão: Como cerca de 1% a 7% dos casos de amiloidose nodular localizada cutânea podem evoluir com envolvimento sistêmico, o seguimento dos pacientes faz-se necessário. O tratamento não é obrigatório, a retirada das lesões pode ser feita se o paciente o desejar, contudo as recidivas são frequentes. Conclusões: Mesmo possuindo baixa prevalência, a amiloidose nodular deve ser reconhecida pelo risco de progredir para acometimento sistêmico e associação com discrasias plasmocitárias, como mieloma múltiplo.

Amiloidosis AL: conceptos actuales / AL amyloidosis: current concepts

Las amiloidosis sistémicas constituyen un grupo de enfermedades con diversas etiologías, caracterizadas por la síntesis de proteínas con plegado defectuoso, capaces de agregarse y depositarse en el medio extracelular de diferentes órganos y tejidos, alterando su estructura y función. Se conocen más de 14 formas de amiloidosis sistémica, de las cuales la más frecuente es la amiloidosis AL, objeto de esta revisión, en la que las proteínas precursoras son cadenas ligeras de inmunoglobulina inestables, secretadas por un clon de células plasmáticas o, con menor frecuencia, por un linfoma linfoplasmocítico o de células del manto. La amiloidosis AL puede llevar a una amplia gama de manifestaciones clínicas y compromiso de órganos, como el corazón y el riñón. El reconocimiento temprano de la enfermedad y el diagnóstico oportuno son determinantes para mejorar la supervivencia de los pacientes. El tratamiento deberá ser individualizado de acuerdo con la condición de cada paciente, lo que hace necesaria una correcta clasificación de los individuos según su pronóstico. La terapia dirigida a la amiloidosis está enfocada esencialmente en disminuir el compromiso orgánico, y por ende, prolongar la supervivencia con mejoría en los síntomas. En esta revisión se discutirán aspectos importantes de la fisiopatología, epidemiología, manifestaciones clínicas, diagnóstico y tratamiento de la amiloidosis AL

Systemic amyloidosis constitutes a group of diseases with diverse etiologies characterized by the synthesis of proteins with defective folding, capable of aggregating and depositing in the extracellular matrix of different organs and tissues, altering their structure and function. More than 14 forms of systemic amyloidosis are known, of which the most frequent is AL amyloidosis, the subject of this review, in which the precursor proteins are unstable immunoglobulin light chains, secreted by a clone of plasma cells or, to a lesser extent, often due to lymphoplasmacytic or mantle cell lymphoma. AL amyloidosis can lead to a wide range of clinical manifestations and organ involvement, such as the heart and kidney. Early recognition of the disease and timely diagnosis are crucial to improve patient survival. Treatment should be individualized according to the condition of each patient, which requires a properly classification of individuals according to their prognosis. Amyloidosis-targeted therapy is essentially focused on reducing organ involvement, and therefore prolonging survival with improvement in symptoms. In this review, important aspects of the pathophysiology, epidemiology, clinical manifestations, diagnosis, and treatment of AL amyloidosis are discussed

Efficacy and safety of daratumumab in the treatment of advanced light chain amyloidosis / 中华血液学杂志

Objective: The study investigated the efficacy and safety of daratumumab in the treatment of cardiac light chain (AL) amyloidosis. Methods: We retrospectively analyzed the clinical characteristics, hematologic response, organ response, long-term survival, and adverse events of 20 patients with newly diagnosed or relapsed/refractory cardiac AL amyloidosis treated with daratumumab in Peking Union Medical College Hospitalo from January 2017 to March 2021. Results: The overall median age of 20 patients was 62 (range, 45-73) yeas, with a male to female ratio of 2.3:1. Nine patients were newly diagnosed, while 11 patients had relapsed or refractory disease. Based on Mayo 2004 cardiac AL staging system, stages Ⅱ and Ⅲ diseases were present in 20 patients respectively. Four patients died during the first cycle of daratumumab, and the remaining 16 patients completed a median of 3 (range, 1-10) cycles of treatment. Overall hematologic response rates were 80% each at 1, 3, and 6 months after treatment initiation, and 45% , 60% , and 60% of the patients achieved at least a very good partial response at 1, 3, and 6 months respectively. The median duration to hematologic response was 13 (range, 6-28) days. At 3, 6, and 12 months, 20% , 30% , and 40% of the patients respectively achieved a cardiac response, and the median days to response was 91 (range, 30-216) days. As of the last follow-up, 9 (45% ) patients died. The 1-month mortality rate of all the patients and stage IIIb patients was 25% and 40% , respectively. The 1-year overall survival rate was 48.4% . Lymphocytopenia was the most common hematological adverse event (above grade 3) . Non-hematological adverse events were mainly infusion-related reactions and infections. Conclusion: Daratumumab could induce deep and rapid hematologic response in newly diagnosed and previously treated cardiac AL amyloidosis patients. However, daratumumab was not effective in preventing the high and early mortality rate in stage Ⅲb patients.

A clinical retrospective analysis of newly diagnosed multiple myeloma patients with systemic light chain amyloidosis / 中华血液学杂志

Objective: To analyze the clinical characteristics, treatment response, and prognosis of newly diagnosed symptomatic multiple myeloma (MM) patients with systemic light chain amyloidosis (AL) . Methods: The clinical data of 160 patients with newly diagnosed MM treated at the First Affiliated Hospital of Soochow University from January 1, 2017 to October 31, 2018, were retrospectively analyzed. According to the histopathological biopsy results of bone marrow, skin, and other tissues, the patients were divided into two groups according to whether amyloidosis was combined or not, namely, the MM+AL group and the MM group. The clinical characteristics and treatment responses of the two groups were compared. Results: Among the 160 patients with newly diagnosed MM, there were 42 cases in the MM+AL group and 118 cases in the MM group. In terms of clinical features, the involved light chain and non-involved light chain (dFLC) in the MM+AL group was significantly higher than that in the MM group (P=0.039) . After induction treatment, the MM+AL group had a higher overall response rate (85.7%vs 79.7%, P<0.05) and higher excellent partial response (76.2%vs 55.1%, P<0.05) . After a median follow-up of 26 (0.25-41) months, there was no significant difference in the progression free survival and overall survival (OS) between the two groups (P>0.05) . The OS of patients in autologous hematopoietic stem cell transplantation group was better than that in non transplantation group (P<0.05) .The prognosis of patients with cardiac involvement in the MM+AL group was significantly worse than that in the MM group and MM+AL group without cardiac involvement (P<0.001) , with a median OS of only 13 months. Conclusion: The differential diagnosis between the MM+AL and MM groups requires histopathology, particularly for patients with significantly increased dFLC. The overall remission rate of patients in MM+AL group after 4 courses of induction chemotherapy was higher than that in MM group. The prognosis of patients with cardiac involvement in MM+AL group was poor.

Systemic amyloidosis manifestation in a patient with psoriatic arthritis

Abstract Systemic amyloidosis secondary to psoriatic arthritis is rare, and published data are based mainly on case reports and are associated with increased mortality. This is the report of a patient with long-term psoriatic arthritis and chronic sialadenitis, who showed an inadequate response to therapy. The diagnosis of secondary amyloidosis was attained through biopsies of genital skin lesions. Although very rare, it is important that dermatologists and general practitioners consider the possibility of amyloidosis in patients with chronic inflammatory diseases, since an early intervention can be implemented, and thus, the prognosis of this condition can be improved.

Patologías cutáneas asociadas a gammapatías monoclonales: ¿qué sabemos hasta ahora? / Dermatological manifestations of monoclonal gammopathies

Monoclonal gammopathies of uncertain significance (MGUS) correspond to pre-malignant hematological disorders characterized by the production of a monoclonal protein and infiltration of less than 10% of the bone marrow by plasma cells. Its importance lies in the risk of progression to malignant disorders and in the association with different renal, neurological and skin manifestations. There are pathophysiological mechanisms that support a causal relationship between monoclonal gammopathies (MGs) and different skin diseases, such as type I cryoglobulinemia (CG), primary systemic amyloidosis (PSA) or necrobiotic xanthogranuloma (NXG). However, there is a group of skin diseases associated with MGs whose pathogenesis has not been elucidated. In this context, the role of the dermatologist is crucial in the suspicion of different haematological disorders based on skin manifestations and in the multidisciplinary treatment of these patients. In this article, we carry out an exhaustive review of the literature published in this area and propose a screening algorithm for MGs in patients with specific skin diseases.

Diagnostic challenges in systemic amyloidosis: a case report with clinical and laboratorial pitfalls

Currently, there is growing evidence in the literature warning of misdiagnosis involving amyloidosis and chronic inflammatory demyelinating polyneuropathy (CIDP). Although inducing clinical manifestations outside the peripheral nervous system, light chain and transthyretin amyloidosis may initially present with peripheral neuropathy, which can be indistinguishable from CIDP, leading to a delay in the correct diagnosis. Besides, the precise identification of the amyloid subtype is often challenging. This case report exemplifies clinical and laboratory pitfalls in diagnosing amyloidosis and subtyping amyloid, exposing the patient to potentially harmful procedures.

The prognostic value of baseline serum free light chain in immunoglobulin light-chain cardiac amyloidosis / 中华血液学杂志

Objective: To analyze the prognostic value of baseline serum free light chain (sFLC) in immunoglobulin light-chain cardiac amyloidosis (AL-CA) . Methods: Thirty patients diagnosed with AL-CA from January 2012 to December 2016 at Beijing Chaoyang Hospital were included in this study to retrospectively evaluate the clinical data. The cut-off value of dFLC (involved sFLC minus uninvolved sFLC) was determined according to the receiver operator characteristic curve (ROC) and grouped, the prognoses of both groups were evaluated. Results: The onset age of all AL-CA patients was 57 years old. It occurred more commonly in men (21 cases, 70%) and the light chains of immunoglobulin composed mainly of type λ (22 cases, 73.3%) . Renal involvements occurred in 17 cases (56.7%) . The median value of difference between involved and uninvolved serum immunoglobulin free light chain levels (dFLC) was 162.9 (57.9-401.6) mg/L. More subjects in the high dFLC group had higher BNP (P=0.005) , and shorter median survival than those in the low dFLC group (15 months vs 47 months, P<0.001) . Similar results of median survival were observed when the patients were redivided by a new cut-off value of 180 mg/L for dFLC (high dFLC group: 22 months, low dFLC group: 40 months, P=0.001) , or a κ/λ ratio in which patients with κ type sFLC-ratio<3.79 and λ type sFLC-ratio≥0.06 were grouped into the low sFLC-ratio (37 months) , and the reverse the high sFLC-ratio ones (25 months, P=0.021) . In multivariate analysis, dFLC and New York Heart Association (NYHA) classification of cardiac function were two risk factors associated with all-cause mortality in patients, of them the hazard ratio for higher dFLC was 12.13 (95%CI 2.98-49.30, P<0.001) . Conclusion: Measurement of the sFLC level could implicate the prognosis of AL-CA.

AL amyloidosis in the Chilean public health system: a pending debt: multicenter study of the Chilean Monoclonal Gammopathies Cooperative Group / Amiloidosis AL en el sistema público de Chile: una deuda pendiente: estudio multicéntrico

ABSTRACT Background: Immunoglobulin light chain (AL) amyloidosis is a rare and underdiagnosed entity. Aim: To characterize patients with AL amyloidosis in Chilean public health centers. Material and Methods: We conducted a retrospective, multicenter study. Public centers of the Chilean Monoclonal Gammopathies Cooperative Group were asked to search for patients with AL amyloidosis in their databases. Epidemiological, clinical and laboratory characteristics were evaluated. Results: Forty-two patients aged 22 to 84 years were found. Twenty four percent had localized AL amyloidosis; 64% had a lambda light chain clone; 47% were associated with multiple myeloma and 9% with non-Hodgkin lymphoma. The most commonly involved organ was the kidney (76%). Serum free light chains were measured in 31% and an echocardiogram was performed in 74% of patients. Seventeen percent of patients received only palliative care, 17% were treated with bortezomib, 21% with thalidomide, and 40% with melphalan. No patient was transplanted. The mean overall survival (OS) of the group was 19 months. The 5-year OS was 28%. Conclusions: It is important to obtain these realistic, national data to initiate strategies to improve early diagnosis and proper management of this disease.

La amiloidosis AL es una entidad poco frecuente y subdiagnosticada. Mientras todo el mundo discute sobre las nuevas herramientas diagnósticas y terapéuticas, en Chile y en América Latina en general, estamos lejos de esa realidad. El objetivo del presente estudio fue caracterizar a los pacientes con amiloidosis AL en centros del sistema público de nuestro país. Se realizó un estudio retrospectivo, multicéntrico, descriptivo. Los centros públicos del grupo cooperativo hematológico chileno buscaron en sus bases de datos pacientes diagnosticados con amiloidosis AL. Se evaluaron las características epidemiológicas, clínicas y de laboratorio. La edad media fue de 65 años. A 24% de los pacientes se les diagnosticó amiloidosis AL localizada; 64% tuvo paraproteína con cadena ligera lambda; 47% se asoció con mieloma múltiple y 9% con linfoma no Hodgkin. El órgano afectado con mayor frecuencia fue el riñón (76%). Las cadenas ligeras libres de suero se realizaron en 31% y ecocardiograma en 74%. El 17% recibió solo cuidados paliativos, 17% recibió tratamiento con bortezomib, 21% con talidomida y 40% con melfalán. Ningún paciente fue trasplantado. La media de sobrevida global (SG) del grupo fue de 19 meses. La SG a 5 años fue de 28%. Es importante reportar estos resultados nacionales para iniciar estrategias que mejoren tanto el diagnóstico temprano como el tratamiento de esta patología. Por lo tanto, mejorar la sospecha diagnóstica es crucial.

Amiloidosis cardíaca en un paciente con mieloma múltiple / Cardiac amyloidosis in a patient with multiple myeloma

Resumen La amiloidosis sistémica constituye una enfermedad poco frecuente, donde la infiltración cardíaca es la principal causa de morbimortalidad, sin importar la causa subyacente del depósito amiloide. Se reporta el caso de una paciente femenina de 48 años con síndrome nefrótico, insuficiencia cardíaca e inmunocompromiso, estableciéndose el diagnóstico de amiloidosis primaria con infiltración cardíaca secundaria a mieloma múltiple. Se discute brevemente la enfermedad, la importancia del juicio clínico apoyado en medios diagnósticos y los retos terapéuticos actuales.

Abstract Systemic amyloidosis constitutes a non common disease in which cardiac involvement is the leading cause of morbidity and mortality, regardless of the underlying pathogenesis of amyloid production. We present the case of a 48 years old female with nephrotic syndrome, heart failure and immunocompromise in which Primary Amyloidosis with cardiac involvement secondary to Multiple Myeloma is established as diagnosis. The disease is briefly discussed, as well as the value of clinical judgment supported on diagnostic means and the therapeutic challenges now days.

Amiloidosis sistémica, a propósito de un caso de autopsia / SYstemic Amyloidosis. About an autopsy case

During history, amylidosis was observed associated to a great variety of inflammatory diseases, and due to this, appeared the term "secondary amyloidosis". The forms of sudden presentation without any apparent cause are classified as "primary amyloidosis", and also the localized amyloidosis was characterized, the same as the heredity variant. At present, three main grops are recognized as systemic amyloidosis: amyloidosis of light chains, the amyloidosis associated to the seric protein A, and the hereditary form. Systemic amyloidosis can involve practically any organ system, being the most commonly affected the heart and the kidney, which therefore determine the clinical evolution and the prognosis of the patient. The aim of this report, was to present a case of autopsy of systemic amyloidosis with involvement of the Central Nervous System, considering besides, the great extension of the disease in our patient

O que há de novo na amiloidose cardíaca? / What's new in cardiac amyloidosis?

A amiloidose caracteriza-se pela deposição localizada ou sistêmica de proteínas com estrutura terciária instável, que se agregam e formam as fibrilas amiloidóticas. A amiloidose cardíaca é uma condição frequentemente subdiagnosticada e causa importante de insuficiência cardíaca. Existem mais de 30 tipos de proteínas amiloides conhecidas, mas somente cinco frequentemente infiltram o coração, causando a amiloidose cardíaca. São elas: imunoglobulina de cadeia leve, imunoglobulina de cadeia pesada, transtirretina, amiloide sérica A e apolipoproteína AI, sendo em sua maioria nas formas de imunoglobulina de cadeia leve ou transtirretina. De acordo com o tipo de proteína fibrilar depositado, a amiloidose cardíaca possui diferentes cursos clínicos, prognóstico e formas distintas de tratamento. Nesta revisão abordamos novas técnicas, que possibilitam o diagnóstico desta entidade, principalmente em situações de insuficiência cardíaca com fração de ejeção preservada e cardiopatias restritivas. O diagnóstico precoce é fundamental na definição da melhor abordagem terapêutica e no prognóstico desses pacientes

Función de la amiloidosis en la neuropatía periférica de los pacientes con anemia drepanocítica / Function of amyloidosis in peripheral neuropathy of patients with sickle cell anemia

Introducción: El estado inflamatorio que acompaña la anemia drepanocítica puede asociarse a amiloidosis sistémica, complicación que ha sido comunicada en esta enfermedad, que también puede afectar los nervios periféricos por el proceso vaso-oclusivo crónico en esta. Objetivos: Evaluar la función de la amiloidosis en el desarrollo de la neuropatía periférica en un grupo de pacientes con hemoglobinopatía SS. Métodos: Para determinar si la amiloidosis participa en el desarrollo de neuropatía periférica en los pacientes con drepanocitosis se estudiaron 45 sujetos mediante evaluación clínica, biopsia de grasa abdominal y estudio de conducción nerviosa, evaluándose si existía relación entre ambos trastornos. Resultados: Se encontraron signos de neuropatía predominantemente sensitiva. Las alteraciones del estudio de conducción fueron constantes, comprobándose que la existencia de amiloidosis aumentó la frecuencia y la severidad de la neuropatía en estos pacientes. La biopsia de nervio peroneo demostró amiloidosis en dos casos. Conclusiones: Los resultados indican que la amiloidosis se relaciona con el desarrollo de neuropatía periférica en los pacientes con anemia drepanocítica(AU)

Introduction: The inflammatory condition that accompanies sickle cell anemia can be associated to systemic amyloidosis, a complication of this disease which can also affect the peripheral nerves because of its chronic vaso-occlusive process. Objectives: To assess the function of amyloidosis in the development of peripheral neuropathy in a group of patients with hemoglobinopathy SS. Methods: In order to determine if amyloidosis takes part in the development of peripheral neuropathy in patients with sickle cells disease, 45 subjects were studied by means of clinical evaluation, biopsy of abdominal fat and a study of nervous conduction, being evaluated if there was any relation between both disorders. Results: Signs of predominantly sensitive neuropathy were found, and the alterations of the study of conduction were constant, being verified that the existence of amyloidosis increased the frequency and the severity of neuropathy in these patients. Peroneal nerve´s biopsy demonstrated that amyloidosis was present in two cases. Conclusions: The results indicate that amiyloidosis is related to the development of peripheral neuropathy in patients with sickle cell anemia(AU)

Amiloidosis AL: reporte de caso clínico en adulto mayor / Amyloidosis AL: clinical case report in elderly

Se presenta el caso clínico de una paciente de 63 años, con indicación de tiroidectomía total, a causa de un bocio multinodular con infiltrado neoplásico folicular. La evolución posquirúrgica fue tórpida y se caracterizó por la presencia de insuficiencia cardiaca aguda, hepatomegalia, neuropatía periférica y equimosis periorbitaria, condiciones clínicas sugerentes de amiloidosis, la que fue confirmada por medio de estudios como amiloidosis de cadenas ligeras (AL).

We present the clinical case of a 63-year-old patient, with indication of total thyroidec-tomy, due to a multinodular goiter with a follicular neoplastic infiltrate. Postoperative evolution was torpid and was characterized by the presence of acute heart failure, hepatomegaly, peripheral neuropathy and periorbital ecchymosis, clinical conditions suggestive of amyloidosis, which was confirmed by studies such as amyloidosis of light chains (AL).

Oral melphalan plus high-dose dexamethasone as first-line therapy for patients with primary light chain amyloidosis / 中华血液学杂志

Objective: To evaluate the response of oral melphalan plus high-dose dexamethasone (MDex) for patients with primary light chain amyloidosis (pAL). Methods: Clinical data, hematological and organ responses, and survival of 76 patients with pAL who had received MDex from January 2009 to July 2017 were retrospectively analyzed. Results: Of 76 patients (47 males and 29 females with the median age of 56 [range, 20-74] years old), 19.70% patients were defined as Mayo 2004 stage 3, involvement of more than or two organs was presented in 65 (85.53%) patients. Among 60 response evaluable patients, overall hematological response was 48.33% with complete response of 20.00% and very good partial response of 20.00%, respectively. The median time to the hematological response was 5 (range, 1-15) months. 36.67% patients achieved organ response. After the median follow up of 23(range, 1-113) months for surviving patients, median progression-free survival (PFS) and overall survival (OS) were 34 and 43 months, respectively. In a three months landmark analysis, the median rates of PFS and OS were 46 and 65 months, respectively. The median OS rates of patients with Mayo 2004 stage 3 and non Mayo 2004 stage 3 were 5 and 65 months (P=0.001), respectively. Conclusions: MDex was an effective treatment for patients with early stage pAL, but was not suitable for those with severe cardiac involvement.

Case for diagnosis. Systemic light chain amyloidosis with cutaneous involvement

Abstract: Systemic light chain amiloydosis is a rare disease. Due to its typical cutaneous lesions, dermatologists play an essential role in its diagnosis. Clinical manifestations vary according to the affected organ and are often unspecific. Definitive diagnosis is achieved through biopsy. We report a patient with palpebral amyloidosis, typical bilateral ecchymoses and cardiac involvement, without plasma cell dyscrasia or lymphomas. The patient died shortly after the diagnosis.

Un caso de amiloidosis AL / A case report of AL amyloidosis

Antecedentes: la amiloidosis es una enfermedad sistémica que resulta del depósito de proteínas mal plegadas; en la amiloidosis de cadena ligera de la inmunoglobulina (AL), las fibrillas están compuestas de fragmentos de cadenas ligeras monoclonales. En la Argentina, la densidad de incidencia de amiloidosis AL es 4,54 cada millón de personas/año. Caso: paciente femenina de 71 años que consulta por dolor neural localizado en miembro superior izquierdo, asociado a edemas en ambos miembros inferiores y disnea de esfuerzo, pérdida de peso, constipación y macroglosia. Al examen físico presenta tensión arterial de 100/60 mm Hg; está afebril, saturando 98% de aire ambiente; peso de 46 kg y un índice de masa corporal de 18,9. Se constatan cadenas livianas libres Kappa: 5,8 mg/L, Lambda: 430 mg/L y con relación K/L: 0,13 mg/L y un ProBNP de 1686 pg/mL. La biopsia de grasa abdominal informó depósitos de amiloide, tinción de rojo Congo positivo. Resonancia magnética (RM) de corazón con contraste (gadolinio), compatible con amiloidosis cardíaca. La tomografía computarizada (TC) de tórax demostró un área de consolidación en lóbulo superior del pulmón derecho, rojo Congo positivo focal. Ante el diagnóstico de amiloidosis AL se realiza tratamiento con CYBORD. Se consolidó el tratamiento con un trasplante autólogo de médula ósea. Discusión: la afectación cardíaca es la principal causa de morbilidad y mortalidad dentro de la amiloidosis. (AU)

Background: amyloidosis is a systemic disease resulting from the deposition of misfolding proteins, in immunoglobulin light chain amyloidosis (AL) fibrils are composed of fragments of monoclonal light chains. In Argentina the incidence density of AL amyloidosis is 4.54 per million people year. Case: a 71-year-old female patient who consults for neural pain located in the left upper limb, associated with edemas in both lower limbs and exertional dyspnea, weight loss, constipation and macroglossia. On physical examination she had blood pressure of 100/60 mmHg, afebrile, saturating 98% of ambient air, weight of 46 kg and body mass index of 18.9. The peripheral blood laboratory has Kappa free light chains: 5.8 mg/L, Lambda: 430 mg/L with K L ratio: 0.13 mg/L and a ProBNP of 1686 pg/mL. Abdominal fat biopsy reports positive Congo red staining. Cardiac magnetic resonance with contrast (gadolinium) has been performed and result compatible with cardiac amyloidosis. Chest CT showed an area of consolidation in the upper lobe of the right lung; positive congo red. With the diagnosis of AL amyloidosis she was treated with CYBORD. Autologous stem cell transplantation was performed. Discussion: cardiac involvement is the main cause of morbidity and mortality by amyloidosis. (AU)

Isolated primary amyloidosis of the inferior rectus muscle mimicking Graves’ orbitopathy / Amiloidose primária isolada do músculo reto inferior simulando orbitopatia de Graves

ABSTRACT The diagnosis of Graves’ orbitopathy is usually straightforward. However, orbital diseases that mimick some clinical signs of Graves’ orbitopathy may cause diagnostic confusion, particularly when associated to some form of thyroid dysfunction. This report describes the rare occurrence of localized inferior rectus muscle amyloidosis in a patient with autoimmune hypothyroidism, who was misdiagnosed as Graves’ orbitopathy. A 48-year-old man complained of painless progressive proptosis on the left side and intermittent vertical diplopia for 6 months. The diagnosis of Graves’ orbitopathy was entertained after magnetic resonance imaging revealing a markedly enlarged, tendon-sparing inferior rectus enlargement on the left side, and an autoimmune hypothyroidism was disclosed on systemic medical workup. After no clinical improvement with treatment, the patient was referred to an ophthalmologist and further investigation was performed. The presence of calcification in the inferior rectus muscle on computed tomography, associated with the clinical findings led to a diagnostic biopsy, which revealed amyloid deposition. This report emphasizes that a careful evaluation of atypical forms of Graves’ orbitopathy may be crucial and should include, yet with rare occurrence, amyloidosis in its differential diagnosis.

RESUMO O diagnóstico de orbitopatia de Graves usualmente é fácil de ser estabelecido. No entanto, doenças da órbita que simulam alguns sinais clínicos da orbitopatia de Graves podem levar à confusão diagnóstica, particularmente quando associada à alguma forma de disfunção tireoidiana. Relatamos a ocorrência rara de amiloidose localizada no músculo reto inferior em paciente com hipotireoidismo autoimune, que recebeu inicialmente o diagnóstico errôneo de orbitopatia de Graves. Paciente masculino, 48 anos, com queixa de proptose progressiva e indolor do lado esquerdo e diplopia vertical intermitente há 6 meses. O diagnóstico de orbitopatia de Graves foi considerado após a realização de ressonância magnética, que revelou aumento importante do músculo reto inferior esquerdo, sem acometimento do tendão, e uma propedêutica sistêmica detectou hipotireoidismo autoimune. Como não houve melhora com o tratamento clínico, o paciente foi encaminhado a um oftalmologista, que realizou nova investigação. A presença de calcificação no músculo reto inferior na tomografia computadorizada, associada aos achados clínicos, levou a uma biópsia da lesão, que demonstrou a deposição de material amiloide. Este relato enfatiza como uma avaliação minuciosa das formas atípicas de orbitopatia de Graves é essencial e deve incluir a ocorrência, embora rara, de amiloidose no diagnóstico diferencial da orbitopatia de Graves.

The usage of Mayo staging system in Chinese patients with primary light chain amyloidosis / 中华血液学杂志

<p><b>OBJECTIVE</b>To evaluate the usage of Mayo staging system in Chinese patients with primary light chain (LC) amyloidosis.</p><p><b>METHOD</b>Clinical data, treatment and outcome of 162 primary LC amyloidosis patients with Mayo Clinic staging in Peking Union Medical College Hospital from January 2009 to June 2015 were retrospectively analyzed.</p><p><b>RESULTS</b>The median age of 162 patients with Mayo Clinic 2004 stage was 57 (20-81) y, of them 62.3% were male. The number of patients with stage I to III were 44 (27.2%), 69 (42.6%), and 49 (30.2%), respectively. The median overall survival was not reached, 23 months and 12 months in patients with Mayo Clinic 2004 stage I, II, and III, respectively (P<0.001). Among 128 patients with Mayo Clinic 2012 stage, 48 patients (37.5%), 32 patients (25.0%), 32 patients (25.0%) and 16 patients (12.5%) were staged as Mayo Clinic 2012 stage 1 to 4, and the median OS was not reached, not reached, 13 months and 3 months, respectively (P<0.001).</p><p><b>CONCLUSION</b>Mayo Clinic staging systems had important prognostic value in patients with primary LC amyloidosis.</p>