ABSTRACT. The aim of the research was to examine the expression level of microRNA221/222 (miR-221/222) in the serum of patients with type 2 diabetes mellitus (T2DM) who are also diagnosed with post-menopausal breast cancer. We aimed to evaluate the differences in microRNA expression in patients with T2DM alone, patients with postmenopausal breast cancer alone, and patients with both T2DM and postmenopausal breast cancer. We selected 20 cases from a healthy control group, 30 cases from the group of patients with T2DM and obesity, 30 cases from the group of the patients with post-menopausal breast cancer, and 30 cases from the group of patients with both T2DM and post-menopausal breast cancer. The expression of miR-221/222 in the serum of the patients with post-menopausal breast cancer was higher than that of T2DM patients (P < 0.05), but lower than that of the T2DM patients who were also positive for post-menopausal breast cancer (P < 0.05); the expression of miR-221/222 in the serum of the T2DM patients was higher than that of the healthy controls (P < 0.05). BMI, HOMA-IR, HbA1c, and TG were positively correlated with the relative expression of miR-221/222 in the serum (P < 0.01). In conclusion, miR-

Alzheimer's disease is a degenerative disease affecting the central nervous system for which donepezil is usually prescribed. The aim of the present study was to examine the effects of donepezil on the cognitive functions and expression levels of β-amyloid (Aβ) in the peripheral blood of patients with Alzheimer's disease. In total, 76 patients with cognitive impairment, who visited the Department of Neurology of Binzhou City Center Hospital from June 2015 to September 2016, had memory decline for more than three consecutive months and underwent mini-mental state examination (MMSE) score screening, were selected for the study. All 76 patients were divided into the experimental (n=38) and control (n=38) groups by random number table. Patients in the control group were treated using conventional drugs combined with Nimotop, and patients in the experimental group received conventional drug therapy combined with donepezil, and the treatment outcomes in the two groups were compared. The MMSE scores and Montreal cognitive assessment (MoCA) scores after treatment in the two groups were significantly increased compared with those before treatment, and the differences were statistically significant (P<0.05). The activities of daily living scale (ADL) was decreased significantly (P<0.05). By comparing with the control group, the MMSE and MoCA scores in the experimental group were higher (P<0.05) while the ADL score was lower (P<0.05), and the adverse reaction rate during the treatment was lower (P<0.05). The Aβ levels in serum after medical treatment were obviously decreased in the two groups, and the difference was statistically significant (P<0.05). The serum Aβ level in the experimental group after treatment was lower than that in the control group (P<0.05). Drug therapy combined with donepezil has a certain degree of influence on the MMSE, ADL and MoCA scores of patients with Alzheimer's disease, which can decrease the Aβ level in peripheral blood and improve the cognitive functions of patients, thus having important clinical significance.