Background The aim of this study was to determine the relative frequency of primary cutaneous lymphoma (PCL) in Argentina according to the new World Health Organization (WHO)-European Organization for the Research and Treatment of Cancer (EORTC) classification system.Methods A total of 416 patients from 21 dermatology services were included during a 5-year period (2010-2015); these patients were classified using WHO-EORTC criteria.Results There were 231 (55.2%) males and 185 (44.8%) females; the male-to-female ratio was 1.35. The median age of the patients was 57 years (range, 0-90 years). Most patients were Caucasian (79%), and only 16% of patients were registered as Amerindian. Most patients (387/416, 93%) had cutaneous T-cell lymphoma (CTCL); 28 patients (6.7%) were diagnosed with cutaneous B-cell lymphoma (CBCL). The most frequent CTCL subtypes, in decreasing order of prevalence, were mycosis fungoides (MF), including its variants (75.7%); CD30+ primary cutaneous lymphoproliferative disorders (7.2%); and S ezary syndrome (SS) (3.1%). Cutaneous follicle center lymphoma was the most common CBCL subtype (2.9%). In the subset of patients ≤20 years of age, the most common condition was MF (57%), followed by extranodal NK-T nasal-type lymphoma (14%). ConclusionsThis study revealed relatively higher rates of MF and lower rates of CBCL in Argentinean patients that have been reported in American and European countries.

Latin American countries view biosimilar agents as an effective approach to curtail health-care expenditures while maintaining the safety and efficacy profile of their branded innovator comparators. To understand the complexities of the regulatory landscape and key therapeutic issues for use of biosimilars to treat moderate to severe psoriasis in Latin America, the International Psoriasis Council convened dermatology experts from Argentina, Brazil, Chile, Colombia and Mexico in October 2015 to review the definition, approval, marketing and future of biosimilars in each country and develop a consensus statement. The regulatory framework for marketing approval of biosimilars in Latin America is currently a mosaic of disparate, country-specific, regulatory review processes, rules and standards, with considerable heterogeneity in clarity and specificity. Regulations in Argentina, Brazil, Chile and Mexico have undergone multiple refinements whereas Colombia is finalizing draft guidelines. Verification of the similarity in quality, safety and efficacy of biosimilars to the innovator biologic remains a key challenge for policy makers and regulatory authorities. Other key regulatory challenges include: naming of agents and traceability, pharmacovigilance, extrapolation of indications, and interchangeability and substitution. An urgent need exists for more Latin American countries to establish national psoriasis registries and to integrate their common components into a multinational psoriasis network, thereby enhancing their interpretative power and impact. A Latin American psoriasis network similar to PSONET in Europe would assist health-care providers, pharmaceutical companies, regulators and patients to fully comprehend specific products being prescribed and dispensed and to identify potential regional trends or differences in safety or outcomes.

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Introducción: El tratamiento de la dermatitis atópica (DA) severa es una necesidad insatisfecha, dada la limitada eficacia y seguridad de los tratamientos sistémicos clásicos (TSC). Dupilumab es un anticuerpo monoclonal que bloquea la señalización de las interleuquinas mediadoras de la respuesta inflamatoria involucrada en la DA. Métodos: se analizó la respuesta clínica de un grupo de pacientes de Argentina con DA severa y respuesta insuficiente y/o toxicidad a los TSC que fueron tratados con dupilumab antes de su disponibilidad comercial. Se evaluaron las escalas EASI, SCORAD, DLQI y escalas visuales analógicas de prurito y sueño, durante una mediana de 189 días de seguimiento, así como la incidencia de eventos adversos. Resultados: Se incluyeron 20 pacientes (13 varones); mediana de edad: 37,5 años; mediana de evolución de la DA: 20 años; comorbilidad atópica: 70%. El 100% habían recibido corticoides sistémicos (complicaciones graves: 20%). Los principales motivos de suspensión de los TSC fueron falta de eficacia y aparición de eventos adversos. Los puntajes de todas las escalas se redujeron significativa y sostenidamente, con respuesta clínica evidente al segundo mes de tratamiento. Al final del seguimiento, solo 3 pacientes requerían tratamiento inmunosupresor sistémico concomitante. Dupilumab fue bien tolerado, con eventos adversos leves y controlables. Discusión: el dupilumab constituye el único agente biológico con elevada eficacia demostrada en estudios clínicos y observacionales. En esta casuística, se confirmó su efectividad en pacientes con DA severa de difícil tratamiento y respuesta inadecuada a los TSC. El perfil de seguridad resultó favorable y sostenido a mediano plazo.

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De un vistazo188 EVIDENCIA -Actualización en la Práctica Ambulatoria Continuamos acercándoles a los lectores un breve comentario de varios artículos de publicación reciente para su lectura de acuerdo al interés individual.