CA9 and neoplasm: Considering our previous works on the tumour promoting effect of MSC, such as resistance to apoptosis and epithelial-to-mesenchymal transition (EMT)11,12, and supporting by the high expression of CAIX in MSC (see Supplementary, Figure S1), we decided to verify whether the CAIX inhibitor SLC-0111 might be able to abolish the MSC tumour promoting effects.