In bi-MR, the causal association between CCL1 [OR (95%CI), 0.94 (0.89–0.99), p = 0.020] and CCL18 [OR (95%CI), 0.94 (0.89–1.00), p = 0.034] and breast cancer (finn-b-C3_BREAST) was found (Figure 3). Here, CCL1 is linked to breast carcinoma.