Please choose the correct ending to complete the given sentence: Health: [header] How to treat leukemia [title] Take it in the pill form. [step] Chemotherapy is a type of chemical that works to kill the cancer cells. One way to take chemotherapy is an oral pill.

Ending1: It kills the cancer cells and helps the invasive cells heal. You can take a pill without a doctor's prescription as this is the most commonly used form of chemotherapy. Ending2: You can find chemotherapy pills in pill form at your local pharmacy or health food store. [substeps] Follow your doctor's directions for taking a typical dose. Ending3: It's a steroid drug that humans use to help kill cancer cells and some are available over-the-counter. Every treatment period for this type of cancer is four to six days, so if you're fighting leukemia, you will need to take your pills as prescribed. Ending4: While a pill may seem less intimidating, it does have the same chemicals as other types of chemotherapy, and you need to pay close attention to the instructions given to you by your doctor or pharmacist. [substeps] For instance, many chemotherapy pills must be taken on a very regular schedule that you shouldn't change.

Answer format: ending1/ending2/ending3/ending4