ERBB2 and breast cancer: With over 7 years of follow up of incident breast cancer (n = 1457) including crucial detail on tumor HER2 status since submission of the 2005–2006 questionnaire, we evaluated whether risk of breast cancer varied by recent use of NSAIDs, and explored whether any associations between NSAIDs and risk of breast cancer were modified by HER2-defined breast cancer subtypes or overweight status.