IL6 and breast cancer: This case-control study investigated associations between <i>IL6</i> rs1800795, <i>TNF</i> rs1800629, <i>CCL2</i> rs1024611, and <i>VEGFA</i> rs699947 polymorphisms, circulating cytokine levels, clinicopathological characteristics, and autonomic nervous system balance assessed by heart rate variability (HRV) in 73 BC patients and 88 controls.