Surgery. Radiation. Chemotherapy.
They are the three pillars of modern cancer treatment. And with every passing year, doctors add to this arsenal of proven therapies.
However, a steady and significant number of patients are adding alternative treatments into their care -- not to replace, but to complement conventional therapies.
In fact, the National Center for Complementary and Alternative Medicine, run by the National Institutes of Health (NIH), currently estimates that more than 60 percent of cancer patients are using complementary and alternative therapies -- not as a substitute for conventional medicine, but as a means to stay as healthy as possible during treatment.
So what's the appeal? To many, alternative and complementary therapies for cancer represent a strategy in which doctors treat a patient as a whole, not just cancer as a disease.
One of the most popular choices in complementary medicine is acupuncture -- a modality that proponents say provides benefits for a host of ills.
"From organ to organ, acupuncture is good for treating headaches and chronic pain, many things having to do with gynecology, including menopause," said Dr. Christiane Northrup, a women's health expert and author of "Women's Bodies, Women's Wisdom" on Thursday's "Good Morning America."
Northrup, a longtime proponent of complementary therapies, said she uses the therapies in conjunction with conventional techniques.
"Many of my patients who have used acupuncture during chemo have not lost their hair or their energy. So it is the perfect complement for chemotherapy."
Indeed, the NIH noted in its Consensus Statement on Acupuncture that various studies have suggested -- albeit inconclusively -- the usefulness of acupuncture in treating adult postoperative and chemotherapy nausea and vomiting. Even for those without cancer, some benefits of acupuncture have been seen in the treatment of addiction, stroke rehabilitation and chronic pain therapy.
Other complementary approaches that many look toward include meditation and yoga. Yoga is normally viewed as a form of exercise, but Northrup said yoga, which she calls "the original healing system," may have benefits beyond flexibility and muscle tone.
"Yoga balances the endocrine system, which include hormones, thyroids, and the adrenals," she said. "It also increases joint mobility which is of vital importance as we age. It can be used to treat arthritis, depression, chronic pain, even asthma."
Northrup added that even massage therapy, which many see simply as a weekend indulgence, may have benefits for cancer patients. She said she believes it can strengthen the immune system and has other health benefits.
But more research may be needed before the treatments are accepted completely by the medical community.
ABC News medical editor Dr. Tim Johnson said on "Good Morning America" on Thursday that further study may be needed in order to fully assess the benefits -- and possible risks -- of complementary techniques.
"My mantra is anything we do to or for the patient should do more good than harm, and anything we do should be carefully studied first," Dr. Tim said. "I feel very strongly that the same standard applies to what we call traditional medicine."
He added that just as certain procedures in conventional medicine, such as stents for blocked blood vessels, warrant further study, doctors must also scrutinize alternative techniques.