11007 Background: Return to work is beneficial both for breast cancer (BC) patients and for society. This study explored the impact of early integrated and vocational rehabilitation on sick leave and disability one year after the start of cancer treatment in BC patients. Methods: The subjects of our prospective study were 435 employed female BC patients (26-65 (mean 52) years of age), who participated in the pilot study on the individualized integrated rehabilitation in 2019-2022 and were followed for at least one year. There were 211 patients in the control group and 224 in the intervention group. The patients completed three questionnaires (EORTC QLQ - C30, B23, and NCCN): before, half and one year after the start of cancer treatment. The control group received the standard rehabilitation programme, offered to all BC patients before the start of the study. The multidisciplinary rehabilitation team reviewed the documentation of the patients from the intervention group before, half and one year after the start of treatment and recommended appropriate interventions according to the patient's needs in compliance with the institute’s new clinical pathway (psychologist, general practitioner, nutritional treatment, physical rehabilitation, kinesiologist-guided online exercises, gynaecologist, analgesia, vocational rehabilitation). Data on the patients’ demographics and needs reported in questionnaires, the extent of the disease and cancer treatment were collected. These data and the frequency of sick leave and disability retirement one year after the start of treatment in both groups of patients were analysed using the chi-square and ANOVA test. Results: The patients from the intervention group had 50 calendar days shorter sick leave compared to the control group (p = 0.002). Patients without metastatic disease from the intervention group had 52 calendar days shorter sick leave compared to the control group (p = 0.002). The intervention group treated with chemotherapy had 43 calendar days shorter sick leave compared to the control group (p = 0.029). The difference in sick leave of the group of patients who did not receive chemotherapy was statistically borderline significant (50 calendar days, p = 0.053). The patients in the intervention group had a better work ability (p < 0.001) and less disability (p < 0.001) than the patients in the control group one year after the start of treatment. Conclusions: One year after the beginning of cancer treatment, patients from the intervention group had shorter sick leave, better work ability, and a lower proportion of disability compared to the control group.