That is, patients with ER negative tumors are at much greater risk of recurrence and death during the early years after diagnosis, whereas patients with ER positive tumors have a fairly consistent long term risk of breast cancer death clomid and nolvadex for pct Int J Med Microbiol 2010; 300 1 57 62 Ogawa et al Protective effect of Lactobacillus casei strain Shirota on Shiga toxin producing Escherichia coli O157 H7 infection in infant rabbits