After adjusting for age at diagnosis, stage at diagnosis, year at diagnosis, marital status, health insurance, SES, ER, PR, chemotherapy, surgery, tumor grade, and cancer histology, first-generation ME immigrants were 11% less likely to die from breast cancer than NHW (HR = 0.89 with 95% CI = 0.82 to 0.97). This evidence concerns the gene PGR and cancer.