To understand this there are a few things you need to know about cancer:
1. It’s not a virus or bacteria or parasite. It is a part of our own body that refuses to cooperate with the rest
2. Because of that it is hard to target directly. We can’t just use a drug that kill everything of a certain cell type because it would kill all the other cells making up our bodies.
3. There are good and bad tumors good ones just grow but leave us alone. Those are usually referred to as benign growth. They attack the body but can cause deformation.
4. Cancer is the bad type of tumor. It diverts blood to itself so it can grow on the expense of killing the oxygen and nutrient supplies of the other cells nearby causing them to die off while the cancer flourishes. (Which can finally result in death)
5. A cancer heavily compromises our immune system. The immune system is responsible for fighting of malicious bacteria, viruses and generally keeping our body’s in working order. So many time when people die of cancer it isn’t really the cancer that kills them but the fact that Thier bodies can’t fight of another disease because of the compromised immune system.
All of this results in the fact that no two cancers are the exactly the same which makes it really hard to develop a universal treatment. It’s not impossible but individual cancer treatments (created for one specific tumor) are way more promising but also extremely expensive since they can’t be mass produced.
Edit: To clarify individual treatments are more likely to result in a cure.
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