PubMed Health⌕ Search

Biomedical subjects

J Ronceray

Publications and source records attributed to J Ronceray.

At least 55 records · Page 3Linked to original sources
PubMed1981

Construction of hybrid plasmids containing the lysA gene of Escherichia coli: studies of expression in Escherichia coli and Saccharomyces cerevisiae.

The lysA gene of Escherichia coli has been cloned from a lambda transducing phage on various plasmids, present in different copy numbers in bacterial cells. Synthesis of the product of this gene, diaminopimelate (DAP)-decarboxylase, and its regulation have been studied. Expression does not follow a simple gene dosage effect, maximal expression already being obtained with a six-copy plasmid. This result suggests that either a positive or an autogenous regulatory mechanism is involved. We also used one of the hybrid plasmids to look for expression of the bacterial lysA gene in Saccharomyces cerevisiae. The results indicate that the product of the E. coli gene is not actively translated in yeast.

Bacterial Proteins↗
PubMed1978

[Unusual digestive manifestations during rheumatoid purpura. Apropos of 2 cases].

We have observed two unusual forms of rheumatoid purpura with digestive symptoms in two young girls aged 16 years. In the first case, the signs of complete duodenal stenosis led to a surgical operation which led to the discovery of an infiltrated mesenteric band of adhesions containing numerous lymph nodes, with on the oedematous loops of small intestine, numerous ecchymoses. In the second case, the duodenal-jejunal radiological abnormalities suggested protein-losing enteropathy. especially as this patient like the first, had major hypoproteinemia without albuminuria. The Cr51 radioisotope test confirmed this quite exceptional diagnosis in this disease.

Adolescent↗
PubMedDate not supplied

Early gastric cancer: univariate and multivariate analysis for survival.

BACKGROUND/AIMS: The aim of this retrospective study was to analyse the characteristics, treatment and prognosis of early gastric carcinoma, based on an analysis of our surgical results. METHODOLOGY: Between 1973 and 1994, 102 patients (68 males, 34 females) with a mean age of 65 years, were operated on for an early gastric carcinoma. Mean follow-up was 7 years. Survival was calculated using the Kaplan-Meier method. Prognosis was determined with univariate and multivariate analysis according to the Cox model. RESULTS: The carcinoma was limited to the mucosa in 57 patients (56%) and extended to the submucosa in 45 (44%). There was a lymph node invasion in 17 patients (16.5%). The post-operative mortality rate was 5.8% (n = 6). Secondary deaths occurred in relation with the gastric cancer in 10.4% (n = 10). The 5- and 10-year survival rates were 84% and 68.6%, respectively. Univariate analysis of prognosis factors showed a significant survival difference according to the age (p = 0.001); submucosal extension (p = 0.03), lymph node invasion (p = 0.0005) and type of gastric resection performed (p = 0.03). With multivariate analysis of prognostic factors, advanced patient age and lymph node metastases were the only independent factors for survival (p = 0.0002 and p = 0.002, respectively). CONCLUSIONS: Prognosis of early gastric cancer is usually excellent. Patients with high risk of recurrence may be identified in relation to lymph node invasion. We propose that lymph node dissection is necessary in addition to gastric resection, at least in patients with high risk of lymph node metastasis.

Adenocarcinoma↗
PubMedDate not supplied

[Amyloid tumors of the lung. Apropos of a new case].

The authors report a new case of pseudo-tumoral nodular amyloidosis of the lungs. The amyloid nodules being discovered during a surgical procedure for an adenocarcinoma of the lower oesophagus. The histopathological study of the nodules confirmed their amyloid origin and allowed to precise their histochemical features.

Aged↗
PubMedDate not supplied

[Obstruction of the extrahepatic bile ducts by tumor debris and/or clots in primary cancer of the liver. Diagnostic and therapeutic problems. Apropos of 9 personal cases and review of the literature].

The onset of jaundice in patients with primary liver cancer is sometimes caused by intra ductal biliary system tumor casts, free floating debris or hemobilia. The diagnosis of this complication is now possible by E.R.C.P. or P.T.C. We report 9 cases of unrecognized primary liver tumor revealed by intra biliary system migration of tumor casts or free floating debris. In three patients the diagnosis was operative, but for the last six cases the E.R.C.P. data in addition with U.S., C.A.T. Scan and/or hepatic angiography were helpful in determining the nature of the hepatic and biliary changes, the operability (size, location, extent). A curative surgery was not indicated in our 8 operated patients: liver resection and biliary decompression. With the palliative procedures, bilio enteric by pass (2 cases) T tube (1 case) trans hepatic uni or bilateral tubes. The survey was not longer than 11 months. Three patients died in post operative course. Only 56 patients among 117 observations of the literature have been operated: 10 liver resections including the main hepatic junction in two cases were performed with one hospital death, two patients were alive over 2 years with recurrence and three patients were disease free with a follow up less than one year. The operative mortality with palliative procedures was 34.4%; the one-two years survival was 23%; the two longest survivors lived 41 and 61 months.

Adenoma, Bile Duct↗
PubMedDate not supplied

[Determination of the carcinoembryonic antigen and endoscopic sphincterectomy in papillomatosis of the bile ducts].

Two new cases of multiple biliary papillomatosis are reported. In these 2 cases, endoscopic retrograde cholangiography (CRE) was performed; the roentgen findings are described; the mucinous aspect of the bile, the important levels of biliary carcinoembryonic antigen and the intraductal biopsies after endoscopic sphincterotomy (E.S.) furnished precious aid for diagnosis; one E.S. was performed in the two cases allowing satisfactory drainage biliary; in one case, surgery and chemotherapy were associated; based on these two cases and 26 others of literature, management of the disease is discussed.

Aged↗