Nat. Genet. 37, 320–327 (2005); published online 13 February 2005; corrected after print 29 March 2010

The GAPF technique identifies palindromes associated with gene amplicons in cancers; however, the initial publication over stimated the frequency of palindrome formation and the frequency of palindromes occurring in similar locations among different cancers. The performance of the modified technique is discussed in the accompanying Correspondence1.