I lost both parents to cancer. My engineering background helped me pour into details in study of this nasty disease. I learned many, many surprising facts. Cancer is being cured at very high success rates but is outside of methods blessed by the AMA and the awareness of the public. Traditional medical practice is profit based and the treatments that truly make a difference and are curing patients simply don't cost much and thusly are denigrated by the AMA, and people die as a result. While you have time, I would suggest you take meaningful action and look at alternatives to traditional treatment. There is a clinic in Tempe, AZ that has a success rate of real cures above 90%. The website is here...
https://natureworksbest.com/, the woman that runs the clinic is Colleen Huber. There are videos online to listen, study and learn. I am not advocating against your fathers doctors at all...just look into alternative and can work in conjunction with your traditional doctors. You have nothing to lose.
My education started when I learned of Dr. William Kelly, a dentist who cured himself of pancreatic and liver cancer in 1962 after his oncologist sent him home to die. He survived long enough to find research done in 1930 that had been archived because it threatened establishment medicine. Kelly developed "The Kelly Protocol" wherein he ingested pancreatic enzymes harvested from pigs to kill all the cancer in his body. He totally recovered and died from congestive heart failure (old age) in 2005. He wrote a small book called "One Cure For Cancer" and personally helped 33,000 late stage cancer patients beat their cancer. This took place over a 40 year period. His success rate of beating cancer for his patients was 95%.. He tried to give this cancer treatment protocol to the President of the AMA at the time who was President of Columbia Medical School. For this effort to help others beat cancer, the AMA spent several decades of attacks intending to denigrate and destroy Dr. Kelly and his reputation. He continued helping others in spite of these attacks until he died in 2005.
It's perfectly natural to doubt and many will tell you that alternative methods are quackery. Some may be but certainly not the two I've mentioned here. Educate yourself and open your mind to consider other methods and possibly learn something that can make a difference. God bless you and my prayers are with you and your family.