- Certolizumab pegol, a monthly subcutaneously administered Fc-free anti-TNFalpha, improves health-related quality of life in patients with moderate to severe Crohn's disease. Rutgeerts, P., Schreiber, S., Feagan, B., Keininger, D.L., O'Neil, L., Fedorak, R.N. Int. J. Colorectal. Dis (2008)