Article révisé par les pairs
Résumé : This article is related to the evolution of a specific research, developed during the 20th century. This research is dedicated to assess “the cancer” incidence in the population of “the lunatics”, and more precisely in the “psychotic population”. It describes the paradigm of this research and the progressive definition of its questions. Moreover, it specifies the chosen diagnostic entities that are used in this research development. The highlights that treating the questions as an “epidemiological puzzle” is assuming and reflecting the acquisition of a medical model to think about mental disease. Because of this, in the field of oncology, psychopathology clinical approach has become outdated.