ATM and glycogen storage disease VI: Protein-truncating variants in ATM were associated with an increased risk of both ER-negative and ER-positive disease with adjusted ORs of 12.55 (1.33-118.68 95% CI, p-value = 0.027) and 7.47 (1.09-51.23 95% CI, p-value = 0.041), respectively.