En fait il semble que, dans le cas de Pfizer, il n’y a pas de phase 3 ; c’est
une méthode qui combine les phases 2 et 3 ; il paraît que c’est un progrès
Randomized phase II/III trials use an adaptive trial design that
combines these two types of trials in one, with potential gains
in time and reduced numbers of patients required to be treated.
https://pubmed.ncbi.nlm.nih.gov/22271475/
Adaptive designs within ongoing Phase II–III clinical trials on
candidate therapeutics may shorten trial durations and use fewer
subjects, possibly expediting decisions for early termination or
success, and coordinating design changes for a specific trial
across its international locations
https://en.wikipedia.org/wiki/Phases_of_clinical_research
Seamless phase II/III Combine selection and confirmatory
stages into one trial Case studies in [133]
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5830330/
Je n’ai rien trouvé en français ; peut-être que ça ne se fait
pas chez nous