Analyses sub-classifying luminal-like breast cancer into luminal A-like, luminal B-like-HER2–, and luminal B-like-HER2+, did not provide any evidence that the associations of BMI at age 18 years or recent BMI in either premenopausal women or postmenopausal women varied across these breast cancer subtypes (results not shown). Here, ERBB2 is linked to breast cancer.