According to this view, the PTPN11, SOS1, and SHOC2 mutation-associated transcriptomes may be considered not only to directly report the grade of activity of the RAS-MAPK axis, but also highlight a more complex transcriptional circuitry that in some cases may result in opposite changes [Amit et al., 2007].
Since the standardisation of fibrosis and grading of activity in CHC, 12 it has been possible to assess the main factors (age and gender) associated with the natural history of fibrosis and its progression to the last stage, cirrhosis.
In addition, Brunt's histological scoring system was used to evaluate the degree of hepatocellular ballooning and lobular inflammation (grade of activity), as well as the stage of fibrosis.
In patients with HCV, histological examination of hepatic biopsies showed a grading of activity from minimum to severe, with no difference between the two groups.
The criteria of histopathological grading are as follows, for grading of activity, in mild cases, the lamina propria of the mucosa is infiltrated with few neutrophils; in moderate cases, more neutrophils are seen in the mucosal layer and can also be seen in between superficial epithelial cells, pit epithelial cells and glandular epithelial cells.
On the other hand, all studies recruited the subjects of different grades of physical activity from the same population.
Notably, the grades of inflammation, activity of gastritis, and atrophy are significantly higher in patients with gastritis who were infected with the East-Asian cagA-positive strain than in patients infected with the cagA-negative or Western cagA-positive strain [ 65].
This is partly due to tumor heterogeneity, with intra-tumor as well as inter-tumor variation based on, for instance, varying grades of mitotic activity, cellular differentiation and presence of normal and inflammatory cells.
No study reported sample size calculation, sufficient power to detect an important difference or minimum detectable difference on values of bone mass between grades of physical activity.
The grading of hepatic activity was done according to the Activity score of Orrego et al. [23].
