Pathologically, PD is characterized by dopaminergic neuronal loss in the nigro-striatal pathway of the brain and by the presence of Lewy bodies and Lewy neurites (reviewed in [3]) that with disease progression, spreads from the brain stem to the frontal neocortex [4].
Hanahan and Weinberg (2000) provided a useful framework for categorising the steps in cancer development, progression, spread and response to treatment in terms of the so-called 'hallmarks of cancer' (Hanahan and Weinberg, 2000).
Metabolic alterations constitute a hallmark in cancer cells: They are required for driving transformation, progression and spreading cancer in tissues [16].
IL-12 treatment of NBEC reduced significantly their ability to release some cytokines/chemokines that have been shown to be involved in NSCLC angiogenesis, progression and spreading [31] [36] such as, for example, MCP-1/CCL2 and IL-6 [37].
However, the increase of proteolytic activity in cancer lesions is universally recognized as a hallmark of cancer progression and spreading.
The interaction between cytokines, chemokines, growth factors and their receptors forms a comprehensive network at the tumor site, which is primary responsible for overall tumor progression and spreading or induction of antitumor immune responses and tumor rejection [ 5].
Other mechanisms responsible for stimulation of tumour progression and spreading by tumour-derived NO are stimulation of tumour cell invasiveness Orucevic et al, 1999; Jadeski et al, 2000) as well as increased expression of angiogenic factors (Morbidelli et al, 2001; Feng et al, 2002).
In conclusion, this is the first report on the concomitant involvement of CXCR4 and CXCR7 receptors both transducing on the mTOR pathway, affecting progression and spreading of human renal cancer cells suggesting that targeting CXCR4, CXCR7 and mTOR may improve therapeutic efficacy and prevent mTOR-targeting agents' resistance.
A biologist may regard a cancer cell as an entity that, during progression, may "spread" its transcriptomic profile, including the generation of a large number of novel molecular species (due to adquired characteristics during its "devolution" from the normal type).
ALS affects not only motor neurons but also their nonneural neighbours, including astrocytes and microglia, whose involvement amplifies the initial damage and drives disease progression and spread [ 19].
