Will chemo delay radiation treatment and make my breast cancer more likely to recur?

No.

(See
Influence of the time between surgery and radiotherapy on local recurrence in patients with lymph node-positive, early-stage, invasive breast carcinoma undergoing breast-conserving surgery: Results of the French Adjuvant Study Group (p 240-250)
Mohamed Benchalal, Elisabeth Le Prisé, Brigitte de Lafontan, Dominique Berton-Rigaud, Yazid Belkacemi, Pascale Romestaing, Karine Peignaux, Adel Courdi, Alain Monnier, Philippe Montcuquet, Marie-Josèphe Goudier, Christian Marchal, Philippe Chollet, Sophie Abadie-Lacourtoisie, Jean Datchary, Corinne Veyret, Pierre Kerbrat
Published Online: 9 Jun 2005

)