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:One of these, GDC0449 [15,34,48], is currently in several phase I and phase II clinical trials for various types of cancers, including pancreatic cancer (trial ID: NCT01064622 and NCT00878163).
Category: