From what I can find, there is no connection between the two. If pertains more to recovery/progression with cancers.

I do know that chemo brain presents similar to concussion and would likely delay healing from a concussion. The brain needs all systems working at their best for the best recovery.

I would suggest not getting to caught up in the micro details. There is a serious lack of information about the processes that relate to concussion.

The only understanding about susceptibility to concussion is based on prior concussion history. Unfortunately, there is a big unknown factor. Many concussions are not memorable either because they were dismissed as minor or they were lost in short term post traumatic amnesia. One needs to have a good understanding of concussion and subconcussive impacts to keep a reasonable mental record of concussions.

Are you struggling to understand certain symptoms or other issues?