Retrospective/Prospective Pilot Study to Evaluate Efficacy and Safety of Switching to BIC/FTC/TAF in PWH With a Previous Virological Failure Under CAB/RPV LAI

This study is a pilot, multi-center, observational retrospective-prospective study, with two different Parts, as follows:

1. Part 1(retrospective and prospective part): to evaluate efficacy and safety of switching to BIC/FTC/TAF in People living with HIV (PWH) who previously failed CAB/RPV LAI in the last three years and received in the last three years boosted PI since any INSTI mutations were detected on RNA and/or DNA through NGS at failure 2. Part 2 (prospective part only): to evaluate efficacy and safety of switching directly to BIC/FTC/TAF in PWH who failed CAB/RPV LAI without any RAMs on RNA and/or DNA through NGS considered of potential relevance for bictegravir

Inclusion Criteria:

* PWH with age \>18 years * PWH with a confirmed virological failure on CAB/RPV LAI in the last three years * PWH without RAMs versus FTC and TAF

Study population: 30 subjects failing CAB/RPV LAI will be included in the study