What happens if you were stricken with breast cancer would you still move?

Sure: Early breast cancer is curable and should not affect your mobility (provided there is no complication related to the treatment). Even advanced cancer patients can do fairly well. Someone who is tremendously debilitated by the cancer or the treatment, or who has spinal or bone damage, or perhaps has terrible pain may become bedfast. One of our goals as oncologists is to avoid that if possible.