Table 1.

Overview of PCOS and BC included in this study

Diseases	Abbreviations	PMID	Data source	Year	Population	N	Cases	Controls	Reference genome
breast cancer	BC	32,424,353	https://bcac.ccge.medschl.cam.ac.uk/bcacdata/oncoarray/oncoarray-and-combined-summary-result/	2020	European	247,173	133,384	113,789	GRCh39 (hg19)
ER + breast cancer	ERPBC	29,059,683	ieu-a-1127	2017	European	175,475	69,501	105,974	GRCh39 (hg19)
ER- breast cancer	ERNBC	29,059,683	ieu-a-1128	2017	European	127,442	21,468	105,974	GRCh39 (hg19)
polycystic ovarian syndrome	PCOS	30,566,500	https://www.repository.cam.ac.uk/handle/1810/289950	2018	European	113,238	10,074	103,164	GRCh39 (hg19)

Overview of PCOS and BC, abbreviations as used throughout the manuscript, associated PubMed ID, Data source and Year of publication, the sample size, population and reference genome on which summary statistics are based, and the number of SNPs included in the original summary statistics, before we applied filtering