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Distant disease-free survival (DDFS; distant recurrences and death) according to serum-defined adherence status in (A) the IPTW cohort and in the (B) non-IPTW cohort. Time 0 defines the time of the post-tamoxifen prescription visit and date of serum assessment of tamoxifen. HR, hazard ratio; IPTW, inverse probability treatment weighting.
