Evaluate the collective function of references cited together in a given text segment.
Classify their combined role into one of the following categories: 'method', 'background', or 'result'.

Text:…is planned for patients with locally advanced carcinomas or with tumors primarily not suitable for breast-conserving surgery, thus the first aim of this therapeutic option is to downsize the disease burden and possibly to achieve pathologic complete response (pCR) (Marchio and Sapino, 2011).
Category: