CX3CL1 and neoplasm: Interestingly, we also noticed upregulation of many major histocompatibility class II molecules that are known to be expressed on antigen presenting cells (HLA-DRA, HLA-DRB5, and HLA-DRB1) along with CX3CL1 (fractalkine, a known monocyte/T-cell attractant molecule) and CSF1 (colony stimulating factor 1, macrophage) suggestive of myeloid cell recruitment and activation at tumor sites post TCB treatment.