Hypothetical questionnaires may overestimate willingness to participate in HIV cure research: Comparison of a cross-sectional survey to actual willingness to participate in an HIV cure study in the Netherlands.

Objective: Little is known about willingness among people living with HIV (PLHIV) to participate in HIV cure research in the Netherlands. We compared results of a cross-sectional questionnaire assessing hypothetical willingness to actual willingness among PLHIV to take part in a clinical HIV cure trial.

Methods: Between March and June 2018, PLHIV visiting the outpatient clinic of a university hospital in the Netherlands were asked to complete a questionnaire about HIV cure research. Results were compared to the number of PLHIV willing to take part in an actual HIV cure study at the same center during an overlapping time period.

Results: In total, 165 participants, predominantly male (80%) from Western European countries (61%) completed the questionnaire. The majority would participate in cure research (n ​= ​111, 67%). Separately, actual willingness among PLHIV to participate in an HIV cure study was addressed in 312 cases. Apart from gender (96% male), baseline characteristics were comparable. Less than half expressed actual willingness to participate in the study (n ​= ​135, 43%).

Conclusions: Hypothetical willingness to participate in cure-related research was high among PLHIV who completed the questionnaire. Actual willingness among eligible PLHIV to take part in an HIV cure study was much lower. Our findings show that questionnaires may overestimate willingness to participate in HIV cure trials and indicate that reasons for refusal in actual research should be further explored.