Guaranteed life insurance is not available at every age, and it has a graded death benefit for the first 2 or more years you are insured by the life insurance policy.
But it does not have any health requirements, if you are within the required age limits, you may qualify for coverage.
You can also purchase pre-need funeral insurance policies at a funeral home while having cancer.
If your cancer was caught in the early stages and has a good prognosis, you should be able to get a life insurance policy other than guaranteed issue about a year or two after your last treatment. So, if you have survived cancer, and are in remission, you may be able to qualify for life insurance other than guaranteed issue plans.