Rate of effect of surgical margins after breast conserving surgery and estimation of direct costs. / Tasa de afectación de los márgenes quirúrgicos tras la cirugía conservadora de mama y estimación de los costes directos.

ABSTRACT

OBJECTIVE: Assessment of the reoperation rate in patients with positive resection margins after initial breast-conserving surgery for breast cancer and estimation of the cost to the hospital. METHOD: 146 patients with diagnosis of invasive breast cancer were included, who were initially intervened with conservative surgery by the Gynecology and Obstetrics Service of Hospital Universitario de Tarragona Juan XXIII (HUTJ23) during the years 2018 and 2019. We calculated the rate of involvement of the surgical margins of the resection piece after initial conservative surgery, establishing in which cases it was necessary to carry out a second resection, estimating the added direct costs of the second surgical procedure, and comparing them with the costs established by the Catalan Health Service according to the level of the hospital and the Diagnosis-Related Groups (DRG) established by the National Health System. RESULTS: The rate of positive margins after initial conservative surgery was 20.55% and 19.17% patients underwent reoperation, generating a total expense of € 129.696,89, € 82.654,34 in conservative surgeries (€ 3.757,01 on average per patient) and € 47.042,55 in mastectomies (€ 6.720,36 on average per patient). CONCLUSIONS: Margin involvement after breast-conserving surgery is synonymous for reoperation, this involves a series of direct costs. It is advisable to control the factors related to affected margins to minimize their impact.