The problem with finding a cure is that cancer is not a single disease, it's an umbrella term for over 200 different diseases. The difficulty with finding a cure is that different cancers are caused by different things, so no one strategy can prevent them They all respond to different treatments so no one treatment can cure them, so there isn't a magic bullet that cures all cancers and there never will be.
But quite a few cancers CAN already be cured: seven out of ten children are cured of cancer; testicular cancer, Hodgkin's disease, and many cases of leukaemia can all be cured in adults with chemotherapy, most skin cancers are cured with surgery and many cases of thyroid cancer and cancer of the larynx are cured with radiotherapy.
Many other types of cancer are also cured if they are found early enough - 75% of breast cancers found at stage one for example.
The suggestion that there's too much money being made from cancer for researchers to bother finding a cure is nonsense, as is any suggestion that a cure exists but is kept secret for reasons of profit. The cancer cure conspiracy theory is a sort of game played by people who've never had or been close to cancer.
Any drug company discovering a cure would make far more money than they can have dreamed of making up till now – fame and fortune beyond their wildest dreams.
Doctors, scientists, researchers etc and their families develop cancer at the same rate as the rest of the population; they would be watching their relatives die and dying themselves rather than cooperating to find cures or revealing a 'secret' one
Most unlikely of all, if there were a secret cure, every medical professional in the whole world would have agreed to keep existence of a cure secret. Every single one. One blabbermouth, one disgruntled researcher or sacked nurse and the whole conspiracy’s blown. Newspapers and other media wouldn't have got a sniff of it. Likely? -and is it likely that these people, who went into medicine to help people, would be conspiring to kill them? If they wanted to make a fortune, medicine was a very poor choice of career.
I live in the UK. Our health care, including our cancer treatments, are paid for by the state. Cancer treatments cost the government billions, yet our treatments are the same as in the US, whence most of these conspiracy theories originate. If there were cheaper, once-and -for-all cures, BELIEVE ME the government would be paying for them rather than expensive conventional treatments. As it is I may be back at any time for more expensive treatment. And our doctors are salaried - if the cancer rate doubled, they wouldn't make one extra penny.
No secret cure then, and no letup in the search for cures and more effective treatments. There is much dedicated - and underfunded - hard work going on to find cures and effective treatments.