MLH1 and hereditary nonpolyposis colon cancer: Current findings that some HNPCC patients carry aberrations exclusively in the TACSTD1 gene leading to the generation of TACSTD1/MSH2 fusion transcripts [46,47] led to the creation of a new version of the P003 kit (B1 version), including TASCTD1 probes to enable simultaneous MLPA analysis of this gene and the major MMR genes (MLH1 and MSH2).