HERESY said:
So you admit to some forms of it being genetic. But would you agree that life choices also contribute to the fact that it develops in the elderly?
I don't
admit anything, these are facts, just as it is a fact that lifestyle is a huge factor
What I wanted to emphasize is that the lifestyle that can reduce your cancer risk is by no means the lifestyle of animals in the wild so it should not be called "natural", it is actually very artificial...
I believe that would depend on when you actually had kids. If you were 40+ when you had kids yes that would be applicable, but if you were in your 20's I don't see how that would work. Do you believe teh following endorses your view?
http://cancer.stanfordhospital.com/forPatients/services/geneticCounseling/Predisposition/
Btw, I remember when I used to reply to the siccness from that spot. Stanford medical is a good place to get treatment if you're battling cancer.
see, I am not speaking about genetic predisposition to cancer, I am speaking about why the species H.sapiens develops cancer when it could have been prevented to a much greater extent with some evolutionary adjustments...
Some lower organisms like Planaria develop cancer very rarely as opposed to mammals
The question is why is that and the answer is that the selective pressure simply has not been there...
Suppose you have a genetic variation that makes you less susceptible to cancer in late age
It provides no selective advantage to you because you have already reproduced and you're most likely dead by the time it will make you better off so it will not be stabilized in the population (you will not reproduce with a greater frequency than other individuals)
Now suppose you have a genetic variation that makes you more susceptible to cancer in late age.
Again, this provides no selective disadvantage to you because by the time you develop cancer, you have already reproduced and transmitted your "bad genes" to the next generation or you're most likely dead
I don't think you got it judging from your post
I believe industrialization has contributed to such an increase (which is why countries liek Japan and america have longer mortality rates), but the age of cancer development would actually depend on the type of cancer and gender of the person.There is no set number for development.
You're generally right but in order to develop cancer you need to acumulate lots of mutations (at least 5 in most cases)
You need to mutate a master regulator of the cell cycle (Rb, INK4, ARF, etc), overactivate mitogenic signalling pathways (for example, oncogenic K-Ras, HER2, APC, or something like this), immortalize cells (overexpress hTERT) destabilize the genome (mutate some DNA repair proteins, or even better, p53), then you need a mesenchyme-to-epithelial transition in order to spawn metastasis, you need angiogenesis, etc.
These are lots of mutations and changes in the genome and it takes years and decades for all of them to occur.
Everyone of us has some of them in many of his cells, but most of these cells will never undergo the second, third, etc. mutation needed for cancer to develop, or will be eliminated by the immune system, undergo oncogene-induced senescence or die from apoptosis
Would you say this mutation is a natural mutation?
what is an "unnatural" mutation?????????????
what's the point of your question?