Partially different results were reported by another group of Korean researchers, who found, in a population of children and adults numerically comparable to that examined by Chung et al., an association between GSTM1 null and AD, family history of AD, childhood onset AD, and AD without other allergic diseases, while the frequency of GSTT1 null was similar in patients and healthy controls [32]. Here, GSTM1 is linked to Alzheimer disease.