Nature Genet. 32, 355–357 (2002).

Published online 15 October 2002; doi:10.1038/ng1013

On the first page, in the third column, the sentence β€œIn two of the nine samples in which we found somatic mutations in TP53 in both the epithelium and stroma, the mutations were discordant between the two compartments (Table 1a, samples 17 and 55; Fig. 1a).” should be changed slightly to read β€œIn two of the five samples...”.