Could migraine be a "protective factor" against tumors?

Patients with migraine headaches show significantly lower prevalence of malignant neoplasms when compared with the general control group or the age-matched control group. Conversely, no significant difference concerning the family history for neoplasms has been found between the two groups. Nevertheless, headache and cancer in a family member in migraneous are not coexistent. Although more extensive, epidemiological studies are necessary to confirm our data, it is suggested that some particular biochemical or psychologic aspects involved in the pathogenesis of migraine might represent the presence of a protective factor against neoplasm development.