I would prefer we focus on eliminating molecules from the diet that feed cancer cells and damage mitochondria. I believe we should also cycle up/down molecules that trigger an up-regulation of NRF2/AMPK to literally digest the senescent and especially the damaged cells prior to them becoming cancerous. I am not really a fan of NR/NMN anyway. Both are more expensive than NAM and my body already converts NAM to NR/NMN, it's just a lot slower than superloading NMN directly, not to mention NMN alone will only activate the Sirt genes but other nutrients are required for repair. Excess NMN is converted back to NAM for storage and when there is too much we just urinate it out. But I am no biologist and the folks pushing these supplements will not respond to my inquiries.
On a related note take some time to watch a video on Cancer as a metabolic disease. [1] This doctor is not a great speaker but it is the content that matters.