Here are the answers to your questions:

1. What tool was used for pathway enrichment analysis?
The tool used for pathway enrichment analysis is IPA (Ingenuity Pathway Analysis).

2. Was a tool version number provided?
Not described.

3. What gene set library was queried (eg: GO, KEGG, Reactome or other)?
Not described, but it is mentioned that IPA pathway analysis was used, which suggests that the IPA knowledge base was queried.

4. Was a background gene list defined for pathway enrichment analysis?
Not described.

5. What statistical test was used for enrichment analysis?
Not described.

6. Was false discovery rate correction used to control the number of false positives in the pathway enrichment analysis?
Not described.