RPA1 and cancer: In the present study, it was found that glandular epithelial cells and cancer cells mainly expressed SCF in RPA and CXPA to some extent, and it is well known that SCF not only acts as a major chemotactic factor for mast cells and their progenitors, but also elicits cell–cell and cell–substratum adhesion, facilitates the proliferation, and sustains the survival, differentiation, and maturation of mast cells [38].