If you're unable to catch it in time, the cancer can spread to the lymph nodes and at that point, the cancer is essentially incurable, but that doesn't mean your condition can't be improved.
I grew up a vegetarian. Then, because I grew up in the states, I started slowly eating meat. First it was bologna sandwiches, or pepperoni on pizza.
I can only put myself in the process and try to learn through the process. Sometimes it will go well and sometimes it won't.