This diversity helps tumours adapt to become untreatable and colonise new parts of the body.
Every year new superbugs are emerging bacteria that have mutated around our antibiotic defenses, resulting in untreatable disease.
This is how a once-curable killer has, over time, become almost untreatable again.
Scientists are keen to use stem-cell research on cloned embryos as a way of curing several previously untreatable diseases.
Continual advances in medical science have enabled hospitals to treat those once untreatable.
But like love and good, evil is an omnipresent force imposing itself on the rest of society like an untreatable cancer.
It seemed to work in the deadly and nearly untreatable triple-negative form of the disease but in January 2011 failed in a clinical trial.
Lodged in his brain is an untreatable and inoperable cancerous tumor that statistics suggest will kill him before he is 40, eight years from now.
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Routine surgery would become life-threatening because of the risk of untreatable infections, care for premature babies and certain cancer patients would falter, organ transplants would be unviable.
Once untreatable diseases can be managed, but at a cost.
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This can motivate companies to study drugs against untreatable diseases first, in the hopes that once a medicine is approved, doctors will start prescribing it for other indications, increasing sales.
In January, Chief Medical Officer for England, Dame Sally Davies, compared the threat to global warming and said going for a routine operation could become deadly due to the risk of untreatable infection.
"With ease of international travel, and increased rates of MDR tuberculosis in eastern Europe, central Asia, and elsewhere, the threat and range of the spread of untreatable tuberculosis is very real, " the report said.
The consequences of a pandemic spread of antibiotic-resistant bacteria could also include shortages of food due to untreatable infections in livestock and, as leaders seek to slow the spread of pathogens, restrictions on trade in foodstuffs and even on travel and migration.
"Stem cell research has the potential to act as the key which opens the door to many advances in our knowledge and our ability to treat some of the most heart-rending conditions that are presently untreatable, " said the Aberdeen South MP, who suffers from a genetic condition called Gaucher's disease which results in brittle bones.
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