Table 1 Characteristics of genome-wide association studies used in the analyses

Migraine

Any migraine (AM)

102,084/ 771,257

IHGC2016 (European descent)

UKBB (European, British)

deCODE (European, Icelandic)

DBDS (European, Danish)

LUMINA (European, Dutch)

35,115,687

Migraine with aura (MA)

14,624/682,301

Migraine without aura (MO)

15,055/703,852

Breast Cancer

Overall BC

122,977/105,974

Oncoarray (European descent)

iCOGS (European descent

29,059,683

ER + BC

69,501/105,974

ER- BC

21,468/105,974