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Oncogenes, growth factors, receptor expression and proliferation markers in digestive neuroendocrine tumours. A
1Department of Gastrointestinal and Liver Diseases, II School of Medicine, La Sapienza University, Rome, Italy. dddhgi@tin.it
Background:
The main characteristic of the digestive neuroendocrine tumours (dNETs) is the low proliferating activity, even in the presence of malignant, metastatic behavior.
Patients And Methods:
Considering that dNETs are rare diseases, relatively numerous studies, often including a conspicuous number of patients, have recently investigated the molecular mechanisms of neuroendocrine tumour genesis.
Results:
In contrast to non-endocrine tumours of the digestive system such as carcinoma of the pancreas, colon and stomach, dNETs do not show alterations in oncogenes (ras, Myc, fos jun, Src) or in common tumor suppressor genes [p53, retinoblastoma suspectibility gene (Rb)]. MEN-1 gene alterations will likely be important in a proportion of sporadic dNETs. The role of various growth factors, novel oncogenes and tumour suppressor genes have also been investigated. However, results from these studies are non-conclusive and to date the molecular pathogenesis of these tumours has not been clarified. Studies on somatostatin receptor expression and synthetic analogues, as growth inhibitors in dNETs, although promising, have not reproduced in vivo all the antiproliferative effects showed in in vitro models.
Conclusion:
Although various functional genes and molecular mechanisms have been investigated in dNETs, to date the molecular pathogenesis of these tumours remains to be elucidated.
Insights
The molecular pathogenesis of digestive neuroendocrine tumors (dNETs) remains unclear despite extensive research into their low proliferating activity and genetic alterations. Further studies are needed to fully elucidate dNET development.
Area of Science:
- Oncology
- Molecular Biology
- Gastroenterology
Background:
- Digestive neuroendocrine tumors (dNETs) are characterized by low proliferation, even with metastatic potential.
- dNETs are rare, prompting numerous recent investigations into their genesis.
- Understanding dNETs is crucial due to their unique biological behavior.
Purpose of the Study:
- To review and summarize current knowledge on the molecular pathogenesis of dNETs.
- To identify gaps in understanding the genetic and molecular mechanisms driving dNET development.
- To highlight the need for further research into dNET molecular pathways.
Main Methods:
- Review of recent studies investigating molecular mechanisms in dNET genesis.
- Analysis of genetic alterations in oncogenes and tumor suppressor genes in dNETs.
- Evaluation of research on growth factors and somatostatin receptor expression in dNETs.
Main Results:
- dNETs lack common oncogene (ras, Myc, fos jun, Src) and tumor suppressor gene (p53, Rb) alterations seen in other digestive cancers.
- MEN-1 gene alterations may play a role in a subset of sporadic dNETs.
- Studies on growth factors and somatostatin analogs have yielded inconclusive results regarding antiproliferative effects in vivo.
Conclusions:
- The molecular pathogenesis of dNETs remains largely unelucidated despite extensive research.
- Current research has not definitively clarified the key molecular drivers of dNET development.
- Further investigation into functional genes and molecular pathways is essential for understanding dNETs.
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