I think I might be confused - I thought we were talking about things from the perspective of what they mean for a health optimizer here on the forum. From that perspective, I still think you may be underestimating the importance of stand alone curing all cancer.
Most of us, have a massive ability to impact our risks of the largest killers of heart disease and stroke. Same goes for most diabetes and metabolic disease. Many other things like fatty liver / NASH / MASH and kidney disease are also almost in this category of really being able impact the odds a lot.
So if we cured cancer, they would not be around the corner to kill us a year or two after we would have gotten sick of cancer.
Hence the biggest risk to someone is their 50s like for you (assuming you are an aggressive health and longevity optimizer) or for someone in their 40s like me over the next decades is roughly speaking cancer and AD.
In that sense the paper you showed me on AD is an outlier since AD is the very leading disease that people historically have thought is the least modifiable.
There is also this context that you have to read that paper: It was by a consensus/committee, that by its nature has to be conservative, and published in one of the perhaps most “medically conservative” major medical journals that there are.
Despite that they went against the prior medical dogma and basically were shouting out that even AD to a large extent is modifiable. I my case applying their numbers I can knock out just north of 50% of the risk of AD and I think that likely is true for many dedicated health optimizers on this forum. And note that that 50% does not take into account the effects of optimized sleep or great exercise practices that they did not include in their calculations since they did not have quantified numbers to use (see next post). So a dedicated health optimizer with great sleep, exercise and other practices (a lot of people on this forum) should generally based on that paper you cited have an even lower AD net risk rate.
So a health and longevity optimizer that is doing “everything” faces materially lower risks for almost all major diseases, even to a large extent for AD as discussed above if we apply the numbers in the paper you cited - except for cancer.
So in this context (which I see the context of the forum), having a cure for cancer would be incredible valuable.
I agree that that is very different from the impact on eg the average American who is not sleeping, eating, exceeding well, not massively optimizing health and longevity, etc, etc, and likely is “dying with” a lot of other diseases beyond the one that kills them and he hence of the other would kills them soon anyway. But I don’t think that is what we as aggressive health optimizers / longevity seekers should base our N=1 decisions on.
The other thing: someone making decision for themselves as one individual - is different from an average of the population.
Many individuals, even if not on average, would for instance get cancer in their 50s or 60s but not AD until I’m their 80 or perhaps even 90s. So in many cases the cure for cancer could mean 3!to 4 to 5 decades. Not on average perhaps, but in enough cases to matter.
(Of course if they did not materially take down their risk of dying of heart disease, stroke, metabolic disease, etc that they can largely impact, they would often not make it to their 80s, or 90s, but those risks can largely be decreased).
I think it’s similar if we could cure AD - that is most of all neurodegenerative disease. And with our increased ability for a health optimizer to (a) decrease cancer risks and (b) screen and find any cancer that still occurs extremely early, not getting AD means the the path to for a dedicated health optimizer to become a healthy 90 or even 100 year old is increased materially.
Above of course means that the ability to intercept all the new science and medicine over the next decades increases a lot. But even without that, for a dedicated health optimizer there are many scenarios where either curing cancer or AD could be the difference of an extra healthy 2-3 and even in key cases 4 extra decades of life with loved ones.
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And nothing above is taking into account whether our longevity practices of modulating mTOR, AMPK, IG-1, autophagy, mitophagy, etc, etc practices are having any addition disease lowering risk on cancer and AD and/or on our individual underlying maximum lifespan potentials - which I personally think there are quite ok odds of actually being the case.