If cancer can spread through the body, why can't it spread to someone else's body?

Question

I'm looking for info. Whether it is contagious or not is a non-issue here. Please, intelligent answers only.

Clarifying the question shouldn't be neccessary. Please read it before you answer.

*Why* is it not contagious? I didn't ask if it was or not. "Erratic duplication of cells" is a very incomplete answer. It can also be cells with mutated genetic info, i.e. cells that formed wrong.

I may have to just delete...

Ok, look. Two parts to this:
1) Cancer can spread throughout the body.
2) Why does it stop with the host body?

#1 does not explain #2. It is only a detail.

Intelligent information will look like this:
Cancer starts at point A in the body.
It does not grow cells adjacent to it, but grows and divides much like a stem cell. Each additional cell used to be half of a parent cell. If one of these cancerous cells were to come to reside within another person's body, their immune system would attack it.

This is obviously not the answer as I am the one who asked this question.

Please don't bother answering unless you are capable of thinking logically and answering in kind.

Thank you.

disintegration, you have a good answer. You may not be a doctor and it may be speculative, but at least you understand basic cognitive reasoning. You have salvaged my failing opinion of mankind. I thank you.

Answer 1

Cancer cells are one's own cells gone awry. Therefore, they are not recognized by the bodies own immune system.

Since they would be foreign to other people and recognized by another person's immune system, they would be attacked and destroyed like any other antigen. Therefore, cancer cannot be contagious.

One possible exception is with identical twins. In theory, if a cancerous organ or blood were donated to a twin, they probably would get that cancer.

An interesting theoretical question is if an immune compromised person were to get a cancerous organ. What would happen? Would immunosuppressant drugs cause the body not to be able to recognize the cancer as foreign and therefore not destroy it? There have been cases of this. Obviously, it's a mind exercise only because cancer patients cannot be organ donors.

Another point about traditional methods of infection, tumors grow with organs. So, they would not be sneezed or coughed out.

Answer 2

Well, interesting question!
If it's a blood disease (and infected cells may travel through the bloodstream and make tumors elsewhere), how come you don't get cancer through a blood transfusion? I'm sure people unaware that they have cancer donate blood every now and them too, don't they?

I suppose that (it's MY guess..), once cancer is a genetic mutation of cells, there may be some genetic factor involved. Like... the altered genetic code of the infected cells doesn't work on the genetic code from other people's cells, and therefore the cancer doesn't go ahead. The altered dna might not know what to do with an entirely different code. Perhaps??

Answer 3

Cancer is not a virus tht can be spread out to people its an abnormal cell in your body that begins to grow throughout your body creating more of the abnormal cell. It not contagious.

Answer 4

Cancer is the erratic duplication of cells in one's own body therefore it is not contagious.

Answer 5

there is in all threat no longer something greater they are in a position to do for you in case you have talked to docs and hospice approximately it. maximum cancers could properly be like this and you basically could go through with it. the only element i can think of of is to invite them regardless of if or no longer you're able to take medicine used for constipation which includes Immodium to help nutrients give up going precise via you. Liquid supplementations are very sturdy nutritionally talking, yet what sturdy are they in case you could no longer use the foodstuff if each and every thing basically is going too quickly via your gadget to soak up the required foodstuff. you're able to give up each and all the diarrhea to make issues greater effective. because of the fact it look as in case your difficulty is terminal, i do no longer see why they could no longer attempt to give up each and all the washing room visits with medicine till it would not help you and that they be attentive to it. a minimum of ask them approximately it.

Answer 6

Cancer is not contagious. It is a sickness of ones blood.

Answer 7

because its YOUR cells that are cancerous. its YOUR body. you cant give someone YOUR deformed cells and have them grow in that other person. its not contagious.

Answer 8

Cancer is not contagious.