Serum TNF-alpha levels in relation to alcohol consumption and common TNF gene polymorphisms

Tumor necrosis factor-alpha (TNF-alpha) mediates alcohol-induced organ dysfunction, including alcoholic hepatitis. Variations in the TNF-alpha gene may underlie the individual predisposition to alcoholic liver disease. Measurement of serum TNF-alpha levels has become a routine in clinical practice. The study was aimed at investigating the level of serum TNF-alpha levels in adults and analyzing its relationship with different levels of alcohol consumption, as well as the potential interaction between alcohol consumption and common TNF-alpha gene polymorphisms in relation to TNF-alpha levels and liver disease. Serum TNF-alpha was measured in a random sample of 459 individuals from a general adult population and in 137 hospital-admitted alcoholics. Three common TNF-alpha gene polymorphisms (-238G>A, -308G>A, and -857C>T) were investigated in 419 of these individuals. In the general adult population, the TNF-alpha levels were similar in alcohol abstainers and alcohol drinkers. Alcoholics admitted to the hospital showed the highest TNF-alpha levels, which were correlated with liver dysfunction. We found no evidence of an interaction between alcohol consumption and TNF-alpha gene polymorphisms in relation to TNF-alpha levels. Carriers of the TNF -238A allele tended to have a higher prevalence of advanced liver disease than -238G homozygotes, confirming previous reports. In conclusion, light-to-moderate drinking had no significant effect on the levels of serum TNF-alpha levels. Serum TNF-alpha levels are elevated in alcoholics independently of common TNF gene polymorphisms.     

Campylobacter enteritis. A 3-year experience

Campylobacter jejuni was isolated from 135 infants and children seen at the Oklahoma Children's Memorial Hospital over a 3-year period. The comparative frequency of isolation of C. jejuni, Salmonella, and Shigella were 1.5 percent, 2.2 percent, and 3.1 percent, respectively. Campylobacter enteritis was most prevalent during the warm months from May to October, peaking in July. Seventy percent of the afflicted children were 2 years old or younger; only 13 percent were older than 5 years. There were the usual clinical presentations (acute onset of diarrhea, fever, abdominal pain, and bloody stools) of Campylobacter enteritis, but other, less common, patterns also were seen. These included chronic diarrhea without significant systemic manifestations; asymptomatic bloody stools, particularly in neonates; and fever and abdominal pain without diarrhea. Severe complications included hemolytic-uremic syndrome, sepsis associated with septic arthritis and osteomyelitis, and failure to thrive.     

Inhibitory effect of melatonin on homocysteine-induced lipid peroxidation in rat brain homogenates

Oxidative damage is implicated in several pathologies including cardiovascular disease. As a model system to study the response of cells to oxidative insults, homocysteine toxicity was examined since it is an independent risk factor for atherosclerotic disease. The levels of malondialdehyde and 4-hydroxyalkenals were assayed as an index of oxidatively damaged lipid. In in vitro experiments, the increase of lipid peroxidation products induced by homocysteine were concentration- and time-dependent. To study the protective effect of melatonin on homocystine induced lipid peroxidation, brain homogenates were treated with different concentrations of melatonin. The accumulation of malondialdehyde and 4-hydroxyalkenals induced by homocysteine was significantly reduced by melatonin in a concentration-dependent manner. Additionally, a melatonin concentration of 1.5 mM reduced the levels of oxidatively damaged lipid products below those measured in control homogenates (no homocysteine, no melatonin). These data suggest that melatonin, an endogenous antioxidant may have a role in protecting cells from oxidative damage due to homocysteine and they support the idea that pharmacological concentrations could be used as a therapeutic agent in reducing cardiovascular disease where homocysteine may be a causative or contributing agent.     

Cost-benefit analysis of the anatomo-pathological study of tonsillectomy specimens in the pediatric population

To study the cost-benefit of the histological examination of tonsilar samples, we evaluated 567 cases (547 routine and 20 nonroutine cases) of patients under 14 years of age, operated between 1st January 1996 and 30th November 2000. There were 2 routine cases (0.3%), and 6 nonroutine cases (30%) with a diagnosis different to follicular hyperplasia. In this way, our clinical preoperative sensitivity was 75% and specificity 97%. The average cost per case at our Centro to study the tonsilar samples was 30$. We conclude that the histological examination of tonsilar specimens is economically worth only in nonroutine cases, although additional factors (e.g. training of residents of Pathology and the quality control of the institution must be taken into consideration.     

Medial pancreatectomy: a multi-institutional retrospective study of 53 patients by the French Pancreas Club

BACKGROUND: The results of medial pancreatectomy have been previously reported anecdotally. The purpose of the study was to provide short- and long-term results of MP in a large multicenter collective series. METHODS: From 1990 to 1998, 53 patients (mean age +/- SD = 49 +/- 15 years) underwent medial pancreatectomy for primary cystic neoplasms of pancreas (n = 19), endocrine neoplasms (n = 17), intraductal papillary mucinous neoplasms (IPMN) (n = 6), fibrotic stenosis of the Wirsung's duct (n = 4), or other benign (n = 4) or malignant (n = 3) diseases. The proximal (right) pancreatic remnant was sutured (n = 53), and the distal (left) remnant was either anastomosed to a jejunal loop (n = 26), to the stomach (n = 25), or oversewn (n = 2). Medial pancreatectomy was indicated in 3 patients (6%) because of failed enucleation, in 3 (6%) to prevent worsening of preexisting diabetes, or to prevent de novo diabetes in a patient with chronic pancreatitis, and deliberately in the 47 others. RESULTS: The length of the resected pancreas was 5.0+/- 2.2 cm (range, 2-15). One patient (2%) died from a pancreatic fistula and portal thrombosis. Three patients were reoperated on because of complications related to the left pancreas, which was partially or totally resected. Pancreatic fistula developed in 16 patients (30%). Mean delay for the return of oral feeding was related to the presence of a pancreatic fistula. At follow-up (median = 26 months, range, 12-131), 1 pancreatic recurrence and 1 de novo diabetes occurred in patients without IPMN. In patients with IPMN, the rates of pancreatic recurrence and diabetes were 40% (2/5), respectively. CONCLUSIONS: Medial pancreatectomy effectively preserves long-term endocrine function and is associated with a low risk of local recurrence, except in patients with IPMN. However, there is a high risk (30%) of PF after medial pancreatectomy.     

Epidermal growth factor receptor is a predictor of tumor response in locally advanced rectal cancer patients treated with preoperative radiotherapy

Epidermal growth factor receptor (EGFR) expression is observed in 50%–70% of colorectal carcinomas and is associated with poor prognosis. The aim of this study was to determine the EGFR expression rate in locally advanced rectal cancer and to analyze whether EGFR expression predicts tumor response to preoperative radiotherapy.

Between December 1997 and October 2000, 45 patients were included. Treatment consisted of preoperative pelvic radiotherapy and, in 21 patients, 2 courses of 5-fluorouracil leucovorin. Surgical resection was performed 4–8 weeks later. Immunohistochemistry for EGFR was determined at the preradiation diagnostic biopsy and in the resected specimens. Immunostaining was performed using EGFR monoclonal antibody (Biogenex, MU 207-UC). Immunohistochemical staining was evaluated according to extension and intensity. We defined positive staining (EGFR+) as extension of 5% or more.

Preoperative treatment resulted in pathologic complete remission in 7 patients (15%), downstaging in 13 patients (29%), and no response in 25 patients (56%). EGFR+ was observed in 29 of 45 tumors (64%) and was associated with neither clinical tumor stage nor clinical nodal stage. The overall response rate was 34% in EGFR+ patients vs. 62% in those who were EGFR− (p = 0.07). Only 1 of the 7 pathologic complete remission patients was EGFR+ (p = 0.003).

EGFR is expressed in a significant number of locally advanced rectal tumors. EGFR expression is an indicator for poor response to preoperative radiotherapy in advanced rectal carcinoma.     

Persistence of the left superior vena cava discovered during the implantation of a hemodialysis catheter

A persistent left superior vena cava (PLSVC) is the most common thoracic venous anomaly. It is a persistent remnant of the left anterior cardinal vein that usually disappears in early embryological development as a result of compression between the left atrium and the hilum of the left lung. If it is not associated with other congenital cardiac anomalies it is usually asymptomatic but has important clinical implications in some situations. In this article, we describe a patient with bilateral SVC identified on a chest radiograph by a haemodialysis central venous catheter passing through it.     

Risk factors related to operative morbidity in patients undergoing gastrectomy for gastric cancer

Introduction The purpose of this study is to analyze postoperative morbidity and mortality of patients operated on for gastric cancer in a single institution during the last twenty years, and to define risk factors for complications. Material and methods A retrospective study was carried out on 434 patients who underwent gastrectomy for gastric cancer between January 1983 and December 2002. Analysis of main medical and surgical complications and analysis of morbidity risk factors. Results Overall morbidity and mortality rates were 38.4% and 2.7% respectively. The most frequent complications were pneumonia (13%) and intra-abdominal abcesses (12%). The main cause of death was anastomotic dehiscence with abdominal sepsis. The last ten years mortality rate dropped from 4.7% to 0.8%. Risk factors for complications were gender (male, p=0.01) and resection of spleen (p=0.02) or pancreas (p=0.002). A significantly lesser rate of complications was found in patients who had underwent gastrectomy during the previous five years (p=0.001) or with tumors located in the lower third of the stomach (p=0.01). Conclusion Morbidity of gastrectomy for gastric cancer in our institution is still high but mortality has decreased significantly over the last ten years due to the specialization of the hospital and the surgical team. The main risk factor for complications was pancreatosplenectomy in the multivariate analysis.     

Significance of the immunohistochemical detection of lymph node micrometastases in Stage II Colorectal Carcinoma

Background Survival results of stage II colorectal cancer patients have led to major efforts to identify the subset of patients at risk for disease relapse and adjuvant therapies benefit. Immunohistochemistry is being explored to detect undetectable microscopic lymph node micrometastases. Material and methods A retrospective analysis of a 105 consecutive stage II colorectal cancer patients was performed. Two four-micres sections were obtained from each lymph node. These slides were stained with AE1–AE3 monoclonal antibodies against cytoskeleton using DAKO EnVision^™ visualization system. Micrometastases were identified either as isolated cells or as well-defined glandular cell clusters with cytoplasm but not the nucleus stained with cytoskeleton antibodies. Results 665 lymph nodes isolated from 105 patients were analyzed. Lymph nodes micrometastases were assessed in 26 out of the 105 patients. 42 (6.3%) out of 665 lymph nodes were infiltrated. Most of these metastases consisted of isolated cell cluster localized in marginal and interfollicular sinus of lymph nodes. The relapse rate was 23.1% among the patients with immunohistochemical detected lymph node micrometastes and 20.3% for the patients without lymph node involvement. This result lacked statistical significance (p=0.759). Discussion AE1/AE3 lymph node immunohistochemical staining in stage II colorectal cancer is an interesting biological phenomenon but it fails to identify patients at higher risk of relapse who deserve a more aggressive adjuvant attitude.