Carlos Nobre-Leitão

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OBJECTIVE Previous studies have demonstrated a link between Helicobacter pylori infection and low grade B-cell gastric MALT lymphoma. The aim of this study was to evaluate the effect of Helicobacter pylori eradication in 17 patients with low grade B-cell gastric MALT lymphoma stage EI. METHODS For disease staging EUS and CT scan were systematically(More)
BACKGROUND & AIMS The aim of our study was to examine, in patients with gastric cancer, the correlation between nutritional status, QoL (quality of life) and serum levels of TNF-alpha, IL-1 and IL-6. METHODS Forty-eight patients with gastric cancer were included. Nutritional status was assessed by % of weight loss in the previous 1 and 6 months,(More)
Microsatellite instability (MSI) is present in most colorectal cancers (CRC) associated with hereditary nonpolyposis colorectal cancer (HNPCC). MSI testing in so-called sporadic forms of CRC may become a useful tool in identifying new HNPCC kindred. The aim of this study was to analyse the utility of BAT-26 as a marker to identify CRCs with MSI and to(More)
BACKGROUND Hyperplastic polyposis (HP) is a rare condition characterized by the presence of multiple hyperplastic polyps in the colon, which has been associated to an increased risk of colorectal cancer (CRC). Guidelines for management of this disease remain, so far, undefined. AIMS To evaluate, in symptomatic patients with HP, phenotypic characteristics(More)
Although several genetic alterations have been identified in patients with ulcerative colitis (UC), it remains unclear whether these changes indicate an increased risk for malignancy. This paper analyzes the involvement of suppressor, mutator, and methylator pathways in malignant transformation associated with UC. A total of 60 colonic samples (47 affected(More)
BACKGROUND Colorectal tumors with microsatellite instability (MSI) that do not comply with previously defined clinical criteria may be found in recently diagnosed hereditary nonpolyposis colorectal carcinoma families. Until recently, the indications for MSI testing were not clearly established. The objective of the current study was to validate the recently(More)
We prospectively analyzed peristomal infection agents during the first week following percutaneous endoscopic gastrostomy (PEG) placement by the pull technique in patients with head and neck cancer. Nasal and pharyngeal swabs were obtained from a consecutive series of cancer patients prior to PEG placement. All patients underwent antibiotic prophylaxis with(More)
BACKGROUND Global DNA hypomethylation has been found in the premalignant stages of some neoplasms and has been implicated as an important factor for tumour progression. AIMS The aim of this study was to evaluate whether DNA hypomethylation occurs during the process of gastric carcinogenesis. METHODS Gastric specimens were obtained from 49 patients and(More)