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:These results, similar to those obtained by Ananthanarayanan et al [17] in cell proliferation and by Helpap [18] in Œ±-methylacyl coenzyme A racemase expression pattern, give support to the presence of a field effect in prostatic carcinogenesis, both in the CyPs and RPs.
Category: