RE: Cautious interpretation of the findings of no increasing risk of breast cancer in users of calcium channel blockers from the population-based cohort study in Taiwan

We sincerely appreciate receiving comments that highlight critical concerns regarding our investigation. Below, we address the issues raised by the author.

First, the concern regarding the sufficiency of a one-year washout period is acknowledged. However, based on the pharmacokinetic profiles of the medications involved, this duration should be adequate. For calcium channel blockers (CCBs), angiotensin-converting enzyme inhibitors (ACEi), and angiotensin II receptor blockers (ARBs), the pharmacological effects are relatively short-lived. Short-acting CCBs typically have a duration of action of 4–8 h, while long-acting CCBs last 18–50 h [1]. For ACE inhibitors, short-acting formulations have a half-life of 1–2 h, and long-acting ones extend up to 12 h. Similarly, ARBs generally exhibit durations of action ranging from 11 to 15 h [2]. Thus, it is reasonable to assume that the pharmacological effects of these medications would have completely dissipated within the one-year washout period.

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