The question is incorrect. The correct question is:
Proteases in general and serine proteases specifically are considered tumor _________ agents because they degrade proteins, especially those in the extracellular matrix. When such proteolysis occurs, cellular invasion and metastasis are ____. Consistent with this observation are numerous observations that metastatic tumor cells are associated with ____ than normal amounts of protease expression. Inhibitors of serine proteases are often tested for their anticancer efficacy.
Answer:
a. promoting
b. encouraged
c. higher
Step-by-step explanation:
A proteases is an enzyme that increases the rate of breakdown of proteins into single amino acids or smaller polypeptides called proteolysis.
Digestive serine protease is responsible for various tumour and promotes proliferation, metastasis and invasion by degrading the extracellular protein. After the observation it is evaluated that metastatic tumor cells are associated with higher than normal amounts of protease expression that involves mixture of digestive enzymes in order to degrade barriers. Serine protease inhibitors is responsible to antagonize the activity of serine proteases by a conserved mechanism involving a profound conformational change.
Hence, teh correct answers are promoting, encouraged and higher.