PGR and breast neoplasm: The OR for traffic B[a]P in 1995 (top 5% vs. below the median) and ER+/PR+ breast tumors was 0.86 (95% CI: 0.52, 1.41), versus 1.15 (95% CI: 0.68, 1.94) for ER+/PR–, ER–/PR+, or ER–/PR– tumors (Table 4).