In the July 2000 issue of the journal (J Med Genet 2000;37:e7), in the electronic letter by Montera et al, two mutations were wrongly described in table 3. For patient F102, the mutation should have read hMLH1 IVS7 −2 a→g, out of frame del exon 8. For patient CA135, it should have read hMSH2 400 ins CA, nonsense.