The aim of this study is to determine if microRNA's have role in predicting multicentricity in breast cancer. If a specific microRNA will be found to be related with multicentricity, it will help us to make appropriate decisions on the treatment of patients with multicentric breast cancer.

In the study that will be held at Bezmialem Vakif University Medical Faculty, General Surgery Department, 20 unifocal and 20 multifocal breast cancer patients will be included. Tissues will be taken from both tumoral and normal breast tissues and they will be saved in microRNA later solution under -80°C. Then, 84 microRNA's will be studied in these tissues to see if they express any of these microRNA's.

Inclusion Criteria:

1. Having breast cancer
2. Having no other malignancy
3. Female patient

Exclusion Criteria:

1. Having other malignancy
2. Under 18 years old
3. Male patient