The investigators are selecting sixty (60) with breast cancer diagnoses where the surgical treatment is indicated.Furthermore the investigators divided in two groups : 1) surgical treatment using regular electric scalpel ; 2) surgical treatment using argon plasma coagulation scalpel. Our primary goal is to measure the bleeding during the surgery using the weight of the surgical tissues used. Secondary we'll evaluate the immediate post operative outcomes, like infection, hematomas and seromas. All these variables will be evaluated by a doctor using our standard clinical record and it will be measured using reliable parameters, for exemple: if the investigators clinically detect a hematoma then we'll perform an ultrasound to take the real extension; if the investigators clinically pick an infection we'll measure the extension of the hiperemia; and if the investigators clinically pick a seroma we'll drain and quantify it. Secondary the investigators going to evaluate and measure (centimeters) the terminal damage caused on the surgical specimens (samples) using the microscope.

Inclusion Criteria:

• operable breast cancer

Exclusion Criteria:

• coagulation disturbs