CTSS and lung cancer: Of the four other proteins, CTSS [OR: 0.87, 95% CI: 0.83 to 0.92; PP4: 0.98] and COMMD7 [OR: 2.97, 95% CI: 2.53 to 3.49; PP4: 0.99] were also associated with lung cancer overall [OR: 0.93, 95% CI: 0.89 to 0.98; PP4: 0.99] and never smoking lung cancer [OR: 2.78, 95% CI: 1.36 to 5.69; PP4: 0.78], respectively.