Personality traits and efficacy of anti-CGRP monoclonal antibodies in migraine prevention.

Background: Anti-CGRP monoclonal antibodies (CGRPmAbs) enlarged migraine prevention options. They work targetedly, safely, and efficiently in many patients. Inexplicably, a proportion of patients show scarce improvement.

Objective: To identify the possible role of personality traits, determined with the Personality Inventory for DSM5 (PID5), on the efficacy of CGRPmAbs on migraine.

Methods: We evaluated 3 parameters: monthly headache days (MHD), monthly painkillers intake (MPI), and MIDAS. For each parameter, patients were classified as: (A) non-responders (reduction < 3 0% vs. baseline); (B) partial responders (30-49% reduction); (C) full responders (reduction > 50%).

Results: Ninety-seven patients treated with CGRP-mAbs were included (33 galcanezumab, 13 fremanezumab, 51 erenumab). Considering attack reduction (MHD), 53 (54.6%) were full responders, 13 (13.4%) partial responders, and 31 (32%) non-responders. Considering MPI, 61 (62.9%) were full responders, 11 (11.3%) partial responders, and 24 (24.7%) non-responders. Concerning MIDAS, 53 (53%) were full responders, 17 (17.5%) partial responders, and 21 (21.6%) were non-responders. All the 97 patients were tested with the PID5. In terms of MHDs, non-responders, in comparison with responders, showed a significant excess of disinhibition, especially in relation with the anhedonia and depressivity facets. Concerning MPI, non-responders showed increased depressivity and distractibility. MIDAS non-responders had significantly higher scores in the antagonism domain and submissiveness facet.

Discussion: Non-responders seem to have different personality traits in comparison to responders, with a higher tendency toward depressed mood and difficulty to feel pleasure previously found in migraineurs vs. non-migraineurs: the more strict certain traits are, the more difficult to treat the migraine could be.