The evidence of efficacy of Agenerase in combination with ritonavir 100 mg twice daily is based on study PRO30017, a randomized, open-label study, in which PI-experienced adults experiencing virological failure (viral load ≥ 1000 copies/ ml) received either Agenerase (600 mg twice daily) in combination with ritonavir (100 mg twice daily) and nucleoside analogues (NRTI) or a standard of care (SOC) PI, predominantly boosted with low-dose RTV.