A Trial of SK-PC-B70M in Mild to Moderate Alzheimer's Disease

Inclusion Criteria: * Age range : 50 \~ 85 years * Clinical diagnosis of probable Alzheimer's disease (DSM-IV and NINCDS-ADRDA criteria) * MRI within the last 12 months consistent with a diagnosis of AD * MMSE score 10 to 26 * AChEI or memantine was discontinued at least 3 months prior to screening Exclusion Criteria: * Patient in mild cognitive impairment (MCI; CDR-SB \<2.5) * Other central nervous disease * hypothyroidism, Vitamin B12/ Folic acid deficiency, hypercalcemia, neurosyphilis, AIDS * T.I.A or Major infarction within the last 12 months * Any serious disorder that could limit the ability of the patient to participate in the study * COPD or asthma * Any condition which would make the patient or the caregiver, in the opinion of the investigator, unsuitable for the study