Sienna+® Injection Time Study 4 Arms

Sienna+® is injected either 1 day or 4-6 days before surgery, either retro-mamillary or peri-tumorally: * Sienna+® retro-mamillary 1 day before surgery: 10 patients * Sienna+® peri-tumorally 1 day before surgery: 10 patients * Sienna+® retro-mamillary 4-6 days before surgery: 10 patients * Sienna+® peri-tumorally 4-6 days before surgery: 10 patients In each case, Technetium as standard technique is employed according to the gold standard protocol one day before surgery. The Sentimag device is used during surgery to detect the lymph nodes in parallel to the standard technique.