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The Knudson hypothesis (aka multiple-hit hypothesis) is the hypothesis that cancer is the result of accumulated mutations to a cell's DNA. It was first proposed by Carl O. Nordling in 1953,[1][2] and later formulated by Alfred G. Knudson in 1971.[3] Knudson's work led indirectly to the identification of cancer-related genes. Knudson won the 1998 Albert Lasker Medical Research Award for this work.
The multi-mutation theory on cancer was proposed by Nordling in the British Journal of Cancer in 1953. He noted that in industrialized nations the frequency of cancer seems to increase according to the sixth power of age. This correlation could be explained by assuming that the outbreak of cancer requires the accumulations of six consecutive mutations.
Later, Knudson performed a statistical analysis on cases of retinoblastoma, a tumor of the retina that occurs both as an inherited disease and sporadically. He noted that inherited retinoblastoma occurs at a younger age than the sporadic disease. In addition, the children with inherited retinoblastoma often developed the tumor in both eyes, suggesting an underlying predisposition.
Knudson suggested that multiple "hits" to DNA were necessary to cause cancer. In the children with inherited retinoblastoma, the first insult was inherited in the DNA, and any second insult would rapidly lead to cancer. In non-inherited retinoblastoma, two "hits" had to take place before a tumor could develop, explaining the age difference.
It was later found that carcinogenesis (the development of cancer) depended both on the activation of proto-oncogenes (genes that stimulate cell proliferation) and on the deactivation of tumor suppressor genes (genes that keep proliferation in check). A first "hit" in an oncogene would not necessarily lead to cancer, as normally functioning tumor suppressor genes (TSGs) would still keep the cancer in check; only damage to TSGs would lead to unchecked proliferation. On the converse, a damaged TSG (such as the Rb1 gene in retinoblastoma) would not lead to cancer unless there is uncontrolled growth from an activated oncogene.
Originally posted by newsoul
Originally posted by rickymouse
It is just a tactic to justify the silicone implants she wants. Next year she will be back bigger and better than before with a breast cancer awareness speech. Sounds like a publicity stunt to me. I want to feel them when she is done to make sure that she hasn't deceived us.
I think I'm going to vomit. Are you freaking serious?? Do you really think that after a mastectomy women have bigger and better breasts?? Well let me tell you what it is like. I was diagnosed with breast cancer last year, it was in my right breast. Because of my FAMILY HISTORY I had both of my breasts removed. After the 6 months of agonizing torture to stretch my skin and muscles, I got my implants. I have a 3 inch scar in the middle of both of my "breasts", I do not have nipples.....it's beautiful, really you should see them
No one in the world would have their breasts removed because they think they will look better after the surgery. Did you know that when a person has a mastectomy that means nipples and all. They dig all of the breast tissue out of your body, up to your collar bone and under your arms. Try getting an implant that covers that area and tell me how pretty it looks. Fool
Originally posted by troubleshooter
reply to post by Seektruthalways1
I think this illustrates better than anything else the failure of the war on cancer.
Originally posted by newsoul
reply to post by NavyDoc
Thank you so much!
It is a suckie, suckie road. I was 39 when I had my mastectomy. I was a rather vain person before the surgery (of course I didn't know that before the surgery), I really learned a lot about the person I was and the person I want to be.
Originally posted by newsoul
Originally posted by rickymouse
It is just a tactic to justify the silicone implants she wants. Next year she will be back bigger and better than before with a breast cancer awareness speech. Sounds like a publicity stunt to me. I want to feel them when she is done to make sure that she hasn't deceived us.
I think I'm going to vomit. Are you freaking serious?? Do you really think that after a mastectomy women have bigger and better breasts?? Well let me tell you what it is like. I was diagnosed with breast cancer last year, it was in my right breast. Because of my FAMILY HISTORY I had both of my breasts removed. After the 6 months of agonizing torture to stretch my skin and muscles, I got my implants. I have a 3 inch scar in the middle of both of my "breasts", I do not have nipples.....it's beautiful, really you should see them
No one in the world would have their breasts removed because they think they will look better after the surgery. Did you know that when a person has a mastectomy that means nipples and all. They dig all of the breast tissue out of your body, up to your collar bone and under your arms. Try getting an implant that covers that area and tell me how pretty it looks. Fool
I'm gonna go way out on a limb here, and state that unless one has had intimate experience with cancer...as a patient, loved one or caregiver (institutional or otherwise)...they really aren't entitled to much of an opinion on the subject.
Originally posted by Lonewulph
Sadly, most people just pop in, spit out a few juvenile words, then leave.
Originally posted by JohnnyCanuck
I'm gonna go way out on a limb here, and state that unless one has had intimate experience with cancer...as a patient, loved one or caregiver (institutional or otherwise)...they really aren't entitled to much of an opinion on the subject.
Originally posted by Lonewulph
Sadly, most people just pop in, spit out a few juvenile words, then leave.
Originally posted by JohnnyCanuck
I'm gonna go way out on a limb here, and state that unless one has had intimate experience with cancer...as a patient, loved one or caregiver (institutional or otherwise)...they really aren't entitled to much of an opinion on the subject.
Originally posted by Lonewulph
Sadly, most people just pop in, spit out a few juvenile words, then leave.
Originally posted by muzzleflash
Our medical records only go back a few decades for most families.
No one bothers to test their living space to find contamination, or check their food source etc.
They just ASSUME it was hereditary because a grandparent had it? What if this family all got exposed to some carcinogenic source? No one even checks for these possibilities most of the time.
Im blown away that despite having almost no historical records, we are presuming it must be hereditary.
Fact is though the entire planet is contaminated to varying degrees, our medical tools are dangerous, our food is packed with toxins, etc.
But we blame grandma ??
No way... I blame industry ... DuPont, GE, Cancer Foundations, Westinghouse, and all the other players making big $$ of the cancer racket.
Originally posted by rickymouse
reply to post by newsoul
I had no idea that it was that much of an operation. Why would this girl have it done if it is that difficult? I wouldn't do it if I were her unless I actually had cancer. I can see you having the other one removed since you had cancer in the one. Sorry if I offended you.
Originally posted by mykingdomforthetruth
cancer is cancer stop eating gmo food and you wont have to cut your tits off
No, but you need to have an investment in what you are talking about. If you ain't been there...you have no freakin' idea. You won't be able to understand until you've been there.
Originally posted by muzzleflash
So to speak about cancer with any legitimacy, one Must be emotionally compromised?
Originally posted by muzzleflash
Originally posted by JohnnyCanuck
I'm gonna go way out on a limb here, and state that unless one has had intimate experience with cancer...as a patient, loved one or caregiver (institutional or otherwise)...they really aren't entitled to much of an opinion on the subject.
Originally posted by Lonewulph
Sadly, most people just pop in, spit out a few juvenile words, then leave.
So to speak about cancer with any legitimacy, one Must be emotionally compromised?
That doesnt make any sense.