Expression of KIF5B-RET fusion protein promotes the growth of positive cell xenograft tumors in vivo . A. 1 × 106 control and enhanced KIF5B-RET expressing A549 cells were separately subcutaneously injected in the left and right flanks of mice, and the mice were shown 1 month later. B. The weight of xenograft tumors was recorded and analyzed (n = 8, **P < 0.01, Student’s t test).