MMP9 and lung cancer: In addition, based on data analysis at the starBase website (http://starbase.sysu.edu.cn), expression of NIK correlated significantly and positively with IL2 or MMP9 in lung cancer patients (Figure S2a, b), and analysis at the KM plotter website (http://kmplot.com) indicated that expression of NIK didn’t affect the prognosis of lung cancer patients (Figure S2c).