This prediction was evaluated using immunohistochemistry with anti‐IBA1 antibodies (for the staining of macrophages and microglial cells) in matched tumour sections and revealed that RS‐based Group2 tumours were more infiltrated by myeloid cells than RS‐based Group1 tumours (Figure 2E), which could be indicative of a differential tumour aggressiveness provided that the infiltrate could be immune promoting or suppressive. Here, AIF1 is linked to neoplasm.