Kowalska A, Wender M, Lannfelt L.
Lack of association between an intronic polymorphism in the presenilin-1 gene and sporadic late-onset Alzheimer disease in Polish patients.
Dement Geriatr Cogn Disord. 1998 May-Jun;9(3):137-9.
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This paper shows the relationship between PS-1 polymorphophism and non-familial sporadic AD patients. We should pay attention to any such studies, including those with negative findings, such as this one.