I read the paper by Chi et al. with interest. The authors found a greater hypoxia response gene
expression in carcinomas
than stromal cells grown in vitro, but were not sure of the underlying explanation (see Discussion in ). The underlying explanation may be the difference in mitotic activity and hence metabolic activity between these two cell types, such that hypoxia may be present within cancer cells, although the surrounding culture media may have similar oxygen levels as the stromal cultures.
The differences in mitotic activity could also explain greater hypoxia-related gene
expression in clear-cell
carcinoma compared with chromophobe carcinoma, normal tissue, or oncocytoma, as clear-cell carcinomas are more active mitotically. Did the authors compare the hypoxia gene expression with mitotic activity in various tumors