Of these, 1 mutation was termed as codon 26 (GAG>AAG), and was found along with Hb E (βE) and (β0)-thalassaemia Filipino-45 kb deletion in 1 patient (1.54%); 3 mutations were termed as IVS 1-2 (T>C) (β0) Cd 26 (GAG>AAG) Hb E (βE) (4.6%); one mutation was termed as Cd 41/42 (-TTCT) (β0), IVS 1-5 (G>C) (β+), and codon 26 (G>A) Hb E (βE) (1.54%); and two mutations were termed as Cd 41/42 (-TTCT) (β0), IVS 1-5 (G>C) (β+), and Cd 17 (A>T) (β0), and were found in 2 patients (3.1%). The gene discussed is GSTM1; the disease is thalassemia.