The immediate goal of the trial was to determine the breast cancer patient tolerance and the toxicity of Laser immunotherapy (LIT), the optimal dose for the alteration of the course of the disease, and the reduction of the tumor burden. Ten stage III and IV cancer patients were treated, all of which were considered to be out of all other options. No toxicity or significant adverse reactions were observed and the treatment was well tolerated by all patients. Almost all the treated patients have had positive responses: A majority of patients experienced large-scale reduction of primary breast tumors, and all the stage IV patients experienced either complete or significant reductions in distant metastases in the lungs, liver, bone, and the brain, indicating a strong systemic effect of the treatment. We also report two cases of triple negative breast cancer patients that showed limited or no response to LIT. © 2011 SPIE.