Infrequent mutation of TRAIL receptor 2 (TRAIL-R2/DR5) in transitional cell carcinoma of the bladder with 8p21 loss of heterozygosity

Loss of heterozygosity (LOH) on 8p is a frequent event in many cancers and is often associated with more aggressive disease. Tumour necrosis factor-related apoptosis inducing ligand (TRAIL) receptor 2 (TRAIL-R2) also known as TNFRSF10B (tumour necrosis factor receptor (TNFR) super family 10b) or KILLER/DR5, a member of the TNFR family, is a promising candidate tumour suppressor gene at 8p21-22. Mutations in this gene have been identified in non-small cell lung cancer, head and neck cancer, breast cancer and non-Hodgkinʹs lymphoma. We carried out mutation analysis of TRAIL-R2 in bladder cancer cell lines and in primary bladder tumours. One novel protein truncating mutation was identified in a bladder cancer cell line. Our results suggest that if TRAIL-R2 is the target of LOH events in these cancers, inactivation of the remaining allele is by a mechanism other than mutation.