The term "tumour progression" means -
Tumor progression is the third and last phase in tumor development. This phase is characterised by increased growth speed and invasiveness of the tumor cells. As a result of the progression, phenotypical changes occur and the tumor becomes more aggressive and acquires greater malignant potential. Together with the progression, more and more aneuploidy occurs. This leads to expression in cell and nuclear polymorphism
Spread of cancer to distant site
Rate of growth of tumour
Ability of cancer cells to resemble their normal counterpa
Sequential appearance of features of increasing malignancy
General pathology