In our study, there were eight patients with the D/G GALT biochemical phenotype among 34 GALT-deficient galactosemia patients, and these patients had an enzyme activity of 5.9–15.8 μmol/h/g Hb (median 7.0 μmol/h/g Hb), corresponding to 21.5–57.5% of the mean control value. This evidence concerns the gene GSTM1 and classic galactosemia.