- To evaluate the durability of sustained virologic response (SVR) in subjects who were treated with a TMC435- containing regimen in a previous Phase IIb or Phase III study and maintained undetectable HCV ribonucleic acid (RNA) until the last planned visit of that previous study (LPVPS). - To evaluate sequence changes in the HCV NS3/4A region over time in subjects who were treated with a TMC435-containing regimen in a previous Phase IIb or Phase III study and had confirmed detectable HCV RNA at the LPVPS.