MUC1 and esophageal squamous cell carcinoma: Intriguingly, when analyzed the TAM phenotype, we observed that oe-MUC1-transfected ESCC cells stimulated the M2 skewing of the co-cultured TAMs, but the polarization of TAMs was not affected by oe-MUC1 when SIGLEC9 was suppressed (Fig. 7e).