[Contribution of intervention to research in the context of a serious disease]

By placing in perspective two ongoing studies based on interventional research dynamics in the field of cancer, this article proposes a review of the specific effects of this type of research. Although this approach is often poorly regarded in the field of academic sociology, it is particularly adapted to the analysis of ongoing processes, providing access to certain phenomena that would be otherwise impossible to observe. The research worker's active involvement, the experience that he/she shares with the subjects studied and the partnerships formed with institutional bodies are the basis for the production of original scientific knowledge, but also sometimes uncomfortable configurations.