(Arabinoxylan) Rice Bran improves natural killer white cell activity

Came across this, which is an lengthy advertisement but well cited about how enzymatically modified rice bran (EMRB)/Arabinoxylan substantially increases the cytotoxicity of natural killer white cells.

http://www.lifeextension.com/magazine/2015/1/activate-your-natural-killer-cells/page-01

Here's the NCBI abstract:
https://www.ncbi.nlm.nih.gov/pubmed/25541298

My question is this: If someone is taking a PD-1 inhibitor, would it make sense to also supplement with this or is it akin to putting gas on a fire?

Thoughts?