The invention discloses an intermediate silk
protein as a biomarker for predicting the staging, prognosis and
drug resistance of
renal clear cell carcinoma and application of the intermediate silk
protein. By detecting the IFFO1 expression level of a ccRCC patient
tissue specimen and analyzing a
database, a new insight is provided for taking the expression quantity of the IFFO1 as a ccRCC biomarker. By changing the expression level of IFFO1 in the
cell, the increase in proliferation, transfer and clone generation of the ccRCC
cell as well as the improvement in
genome stability are detected. In addition, after the IFFO1 is expressed in the ccRCC cells, the tolerance degree to
sunitinib is increased, and the expression quantity of the IFFO
protein family in the constructed ccRCC
drug-resistant cells is increased. Researches show that the IFFO protein in ccRCC stabilizes a
genome and promotes the tolerance of cells to
a DNA damage
inducer and a
tyrosine kinase inhibitor
sunitinib,
molecular mechanism research and
drug development taking IFFO as a target spot are beneficial to improvement of a
treatment effect, and the IFFO protein has clear and beneficial practical application value.