Ploidia de DNA em astrocitomas: estudo em 66 pacientes brasileiros DNA ploidy in glioma: study in 66 Brazilian patients

A determinação do conteúdo de DNA nuclear (fração de fase S e ploidia de DNA) foi realizada por meio de análise de imagem em 66 astrocitomas, a partir de material fixado em formalina e seccionado em cortes de 5 micrômetros corados pela técnica de Feulgen. Nossos resultados mostraram forte relação entre a idade do paciente, grau histológico e sobrevida , com a ploidia de DNA e o percentual de células em fase de síntese. A análise da atividade proliferativa de astrocitomas intracranianos é a nosso ver muito útil no entendimento do comportamento biológico , do prognóstico e para o planejamento terapêutico dessas lesões.<br>The determination of the nuclear DNA content (S-phase fraction (SPF) and ploidy) was carried out by image analysis (IA). The morphometric and densitometric features of Feulgen-stained nuclei were determined from stored formalin-fixed and paraffin-embedded specimens of 66 patients with intracranial astrocytomas. Our results suggest a strong relationship between patient age, histological grade,survival and DNA ploidy and SPF. The analysis of the proliferative activity of intracranial astrocytomas is very helpfull in understanding biological stractification and prognostication to assess tumor behaviour and planning of treatment strategies

Dermatofibrosarcoma: report of a case with complete response to imatinib and conservative surgery during the COVID-19 pandemic

Dermatofibrosarcoma protuberans (DFSP) is an extremely rare and potentially aggressive soft tissue tumor. Around 85 to 90% of DFSP cases are low-grade tumors, while the fibrosarcomatous variant (DFSP-FS) is associated with medium and high-grade neoplasms. DFSP affects more young adults, in their 30s; however, it can be present in all ages. It has a high potential for locoregional dissemination and recurrence, directly related to tumor size. In the present study, a case of dermatofibrosarcoma protuberans with local recurrence after surgical treatment will be reported, subsequently treated with imatinib and a new surgical approach, with no new recurrences so far. The effectiveness of imatinib is noted in a deep, infiltrative and relapsed DFSP, in which upfront surgery would cause significant functional and cosmetic damage. Imatinib allowed an important clinical improvement for the patient, with tumor reduction in the initial weeks of treatment