How would you approach timing of adjuvant chemotherapy in a Stage 1 TNBC lost to follow up for >1 month since surgery?

Delayed initiation of adjuvant chemotherapy beyond 60-90 days has been linked to inferior outcomes in several studies (see for example Chavez-MacGregor et al., PMID 26659132). However, if this worse outcome is primarily due to time delays in chemotherapy or driven by other variables (e.g. ability to...