Cancer progression the evolution of malignant tumors towards metastatic dissemination is a complex, multistep process orchestrated by neoplastic cells but aided by elements of the tumor microenvironment such as macrophages, activated fibroblasts, and endothelial cells.
Delineation of the disparate effects of histone-deacetylase activity in stem cells, progenitor cells, and fully differentiated cells may confirm initial findings suggesting that histone-deacetylase inhibitors push malignant cells towards terminal differentiation, while simultaneously exerting a proliferative and differentiating effect on normal stem cells.
Transformation hampers progression of malignant cells towards terminal osteoblastic differentiation while maintaining cell proliferation.
On the basis of our data, we hypothesise that apricoxib stimulates the reversion of malignant cells towards a relatively normal phenotype.
The attention of this review is therefore drawn away from epigenetic treatment effects on malignant cells towards genomic stability in healthy human cells.
The high sensisitivity of most primary hematopoietic malignant cells towards MegaFasL could be explained by its potent killing effects compared with other Fas agonists.
These lesions have the potential of malignant progression towards invasive carcinoma, largely due to the inactivation of tumour suppressors p53 and pRb by viral oncoproteins.
Although tightly linked to cervical cancer development, HPV infection alone is not sufficient for oncogenic transformation, and other factors than HPV are required for the malignant transformation towards cervical adenocarcinomas (Skyldberg et al, 1999; Pirog et al, 2000).
Alternatively, it is possible that breast cancers arise from a transforming event in multipotent progenitor cells and that acquired alterations (e.g. high autocrine ER stimulation or ERBB2 amplification) drive the differentiation of the malignant cells towards a luminal fate.
Syndecan-1 is the most thoroughly investigated member of the syndecan family and downregulation of cell membrane syndecan-1 is regarded as initial step towards malignant transformation in various malignancies [ 11, 13].
