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  • 1995-1999  (2)
  • 1999  (2)
  • Hepatic metastases  (1)
  • Key words Enterohemorrhagic Escherichia coli  (1)
  • 1
    ISSN: 1617-4623
    Keywords: Key words Enterohemorrhagic Escherichia coli ; Bacteriophage ; Shigella dysenteriae ; Shiga toxin ; Genetic organization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The nucleotide sequence of an 11,142-bp region including the stx 2 operon in the genome of the temperate bacteriophage 933W in the EDL933 strain of Escherichia coli O157 was determined and compared to the respective regions derived from other lambdoid bacteriophages. In phage 933W, a region of ORFs interlinked by overlapping start-stop codons (ATGA) was detected preceding the toxin gene. These ORFs show a high degree of sequence identity to genes of the nin region of phage λ. Immediately downstream of these nin genes we identified an ORF that may code for an antiterminator similar to the λ Q protein. It is concluded that toxin expression is directly associated with the initiation of cell lysis. Downstream of the stx 2 operon we identified an ORF that is homologous to the holin gene S of bacteriophage PA-2. PCR primers were designed, which, based on a comparison of the phage sequences, appeared to be common to both stx 1 - and stx 2 -harbouring phages. However, only seven of the 22 STEC strains investigated from serogroups O157, O26, O103 and O111 yielded the expected PCR amplification product. The data reported here may be useful in developing new strategies for inhibiting the expression of Stx and for developing universal diagnostic primers for use in tracking the origin and evolution of Shiga toxins and the phages that carry them.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1435-2451
    Keywords: Key words Liver transplantation ; Neuroendocrine pancreatic tumors ; Hepatic metastases
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Background: Metastatic neuroendocrine pancreatic tumors have a poor prognosis. We have studied retrospectively the efficacy of liver transplantation as ultimate therapy of otherwise untreatable symptomatic neuroendocrine hepatic metastases originating in the pancreas. Methods: We reviewed our experience of liver transplantation (LTx) for hepatic metastases of neuroendocrine pancreatic tumors in ten patients. The indication for liver grafting was seen in cases of irresectable metastases and when patients were suffering from otherwise untreatable tumor-associated symptoms due to massive hormonal release or large intra-abdominal tumor bulk. Results: In four patients, the primary tumors had been removed before LTx, in five patients simultaneously with LTx and in one case 46 months after grafting. There was no operative mortality. After hepatectomy and LTx, all patients had complete relief of symptoms and all preoperatively increased hormonal levels returned to normal. In nine of ten patients, the transplant procedure had the potential for cure, whereas, in one patient, the primary tumor had remained in situ at LTx and was removed 46 months later by an R2-resection. At present, nine patients are alive with a median follow-up of 33 months (range 13.5 months to 117 months). The one patient in whom the primary tumor was removed after transplantation died due to massive intra-abdominal tumor spread 68 months after LTx. Currently, two patients are without evidence of disease, but one of them after re-operation because of lymph-node metastases 8 months after transplantation. The longest disease-free survival is now more than 7 years. In seven of nine patients, tumor recurred between 1.5 months and 48 months after transplantation. Conclusions: Patients with otherwise untreatable symptomatic neuroendocrine hepatic metastases of pancreatic origin may benefit from total hepatectomy and liver transplantation with regard to symptomatic relief and long-term survival, despite frequent recurrence of disease. In some patients, liver transplantation may even offer the chance for cure.
    Type of Medium: Electronic Resource
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