Human: How long do you think it will be before a cure for cancer is discovered? Assistant: 
I don’t know. Cancer is a complex disease, and there are many different types of cancer. Some cancers are easier to treat than others. For example, breast cancer is one of the most common cancers in women, but it can often be treated successfully with surgery, radiation therapy, or chemotherapy. Other cancers are harder to treat. For example, pancreatic cancer is very hard to treat because it has spread to other organs in the body.