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[Correspondence] Cancer survival rates: the CONCORD-2 study

We were surprised to read the findings of the CONCORD-2 study published in The Lancet (March 14, p 977),1 specifically with respect to the 5-year cancer survival rate presented for the city of Goiânia, Brazil.1 The net survival rate presented for patients diagnosed with breast cancer between 1995 and 1999 was 79·4%, 63·9% between 2000 and 2004, and 59·2% between 2005 and 2009.1 We believe that these data might not be reliable since they do not accord with previous studies done with the Goiânia population-based cancer registry.