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:Accumulating evidence indicates that NSAIDs have pleiotropic effects in many cell types, and therefore may have a therapeutic role in several conditions including prevention and treatment of certain types of cancer,([36]) and in prevention and treatment of neurodegenerative diseases, such as Alzheimer disease.([22]) It has been demonstrated previously that Ibuprofen, as well as other NSAIDs, activate PPARγ in several cell types.
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