In the univariable analyses of having any sick leave versus having worked continuously between T2 and T3 (Table 2), we observed a positive association between having a sick leave between T2 and T3 and stage III, tumour subtype (HR−/HER2+), being severely fatigued, being distressed, having workplace accommodations, reporting discrimination from employers, working part‐time and returning to work because of fear of losing their job and a negative association with age, good physical functioning and prioritising professional over private life. This evidence concerns the gene ERBB2 and neoplasm.