Incidence of anterior segment neovascularization during intravitreal treatment for macular edema secondary to central retinal vein occlusion / Incidência de neovasos de segmento anterior durante o tratamento de edema macular secundário a oclusão da veia central da retina

ABSTRACT Purpose: To analyze the effects of injections of intravitreal triamcinolone acetonide (IVTA) and intravitreal bevacizumab (IVB) on the incidence rates of anterior segment neovascularization (ASN) and neovascular glaucoma (NVG) in patients with macular edema secondary to central retinal vein occlusion (CRVO). Methods: In this prospective, randomized, double-masked, sham-controlled study, 35 patients with macular edema following CRVO were randomized to intravitreal bevacizumab, intravitreal triamcinolone acetonide, or sham injections during the first 6 months of the study. The primary outcome was the incidence rate of ASN at month 6. The secondary outcomes were the mean changes from baseline in best-corrected visual acuity (BCVA) and central foveal thickness (CFT) on optical coherence tomography over time to month 12. Results: ASN developed in 8 (22.86%) eyes, including 5 (62.50%) eyes in the sham group and 3 (37.50%) eyes in the IVTA group, during 12 months of fol low-up (p=0.009). BCVA differed significantly (p<0.05) among the groups only at month 1. CFT did not differ significantly (p<0.05) among the groups over 12 months. NVG required surgery and developed in one eye despite laser treatment. Conclusion: Early treatment with intravitreal antivascular endothelial growth factor therapy decreases the rates of ASN and NVG after CRVO.

RESUMO Objetivo: Analisar as taxas de incidência de neovascularização do segmento anterior (NSA) e de glaucoma neovascular (GNV), em pacientes com edema macular secundário a oclusão de veia central da retina (OVCR), em tratamento com injeções intravítreas de triamcinolona (IVTA) ou bevacizumab (IVB). Métodos: Neste estudo prospectivo, randomizado, duplo mascarado e sham controlado, 35 pacientes com edema macular secundário a OVCR foram randomizados para IVB, IVTA ou para o grupo controle (sham), durante os 6 primeiros meses do estudo. O desfecho primário foi a taxa de incidência de NSA no mês 6. Os desfechos secundários foram alterações médias da acuidade visual corrigida (BCVA) e espessura foveal central (EFC) ao exame de tomografia de coerência óptica, até o mês 12. Resultados: NSA ocorreu em oito (22,86%) olhos, cinco (62,50%) olhos no grupo sham e três (37,50%) olhos no grupo tratado com injeções intravítreas de Triamcinolona, Não houve nenhum caso com NSA no grupo tratado com bevacizumab durante 12 meses de acompanhamento (p=0,009). A BCVA apresentou diferença estatisticamente significante (p<0,05) entre os grupos, somente no mês 1. A EFC não apresentou diferenças estatisticamente significantes (p<0,05) entre os grupos ao longo dos 12 meses. GNV ocorreu em um olho apesar do tratamento com laser e este paciente necessitou de intervenção cirúrgica. Conclusão: O tratamento precoce com injeções intravítreas de Anti VEGF podem diminuir as taxas de neovascularização do segmento anterior e glaucoma neovascular após oclusão de veia central da retina.

Association of Vascular Endothelial Growth Factor Gene Polymorphisms with Susceptibility and Clinicopathologic Characteristics of Colorectal Cancer

Since vascular endothelial growth factor (VEGF) is known to be a potent pro-angiogenic factor, we evaluated the potential association of two VEGF gene polymorphisms (-634G>C and 936C>T) with the susceptibility and the clinicopathologic characteristics of colorectal cancer (CRC). The VEGF genotypes were determined using fresh colorectal tissue from 465 patients who had undergone a surgical resection and peripheral blood lymphocytes from 413 healthy controls by PCR/DHPLC assay. For the -634G>C polymorphism, the -634 GC or CC genotype was associated with a decreased risk of CRC (odds ratio [OR], 0.62; p=0.001) as a dominant model of C allele, whereas the 936 TT genotype correlated with advanced stage/ metastasis, a high serum level of CA19-9, and an higher grade in patients with CRC. In the haplotype analyses, haplotype -634C/936C and -634G/936T were associated with a decreased susceptibility of CRC (OR, 0.53 and 0.56; p<0.001, respectively). These observations imply that the VEGF gene polymorphisms may be associated with the susceptibility or clinicopathologic features of CRC. However, further studies of other VEGF sequence variants and their biological functions are needed to understand the role of the VEGF gene polymorphisms in the development and progression of CRC.

Recorrência da neovascularizaçäo da coróide na degeneraçäo macular relacionada à idade / Recurrent occult choroidal neovascularization in age related macular degeneration

Apresentaçäo de 2 casos de recorrência da neovascularizaçäo de coróide (CNV) na AMD-related, estudou-se pela videoangiografia digital com a indocianina verde. Mostra a importância do referido exame no estudo de casos de CNV oculto e recorrente na degeneraçäo macular relacionada à idade