Aryl hydrocarbon receptor-interacting protein (AIP) is a co-chaperone to heat shock proteins and nuclear receptors. Loss-of-function heterozygote germline mutations lead to predisposition to growth hormone- or prolactin-secreting pituitary typically presenting in childhood. Based on these data AIP behaves as a tumour suppressor. However, previously in diffuse large B cell lymphoma and now in this new manuscript in the British Journal of Cancer on colorectal cancer, it seems that high expression of AIP is associated with tumour development and more aggressive disease. AIP, therefore, joins a distinguished group of proteins that can behave both as a tumour suppressor and as an oncogene.
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