MCNT@WORK is a prospective multicenter observational study assessing how chronic noncommunicable diseases affect work ability, quality of life, psychological well-being, and occupational participation. It will enroll at least 200 working-age adults with inflammatory bowel disease or breast cancer, assessed at baseline and after 12 months. The study will collect clinical, functional, psychological, social, and occupational data to identify factors linked to reduced work ability, absenteeism, presenteeism, return-to-work barriers, or early labor-market exit. Findings will support an integrated clinical-occupational care pathway, combining specialist care and occupational medicine. The goal is to promote personalized support, safe return to work, job retention, and sustainable employment.