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Complementary and alternative therapies for cancer

Edzard Ernst, MD, PhD, FMEdSci, FSB, FRCP, FRCP (Edin.)
Section Editor
Paul J Hesketh, MD
Deputy Editor
Diane MF Savarese, MD


Complementary and alternative medicine (CAM) is defined by the National Center for Complementary and Alternative Medicine as a group of diverse medical and health care systems, practices, and products that are not normally considered to be conventional medicine [1]. Included in this type of therapy are herbs, acupuncture, chiropractic, and massage, among others. Use of these therapies is common in the general population.

The use of CAM is widespread. Multiple studies have found that within one year, up to 90 percent of patients with cancer used a CAM approach for at least a part of their therapy [2-10]. However, patients may not reveal the use of CAM unless specifically asked. In one study, disclosure of the use of these therapies increased from 7 to 43 percent when directed questions were added to standard history taking [11]. Unfortunately, communication between oncologists and patients about CAM is poor, infrequent, and mostly initiated by patients or their kin [12].

Users of CAM are generally not dissatisfied with conventional medicine but find alternatives to be more congruent with their own values, beliefs, and philosophical orientations toward health and life [13]. Factors reported to be associated with use of CAM therapies in cancer patients include:

Increased psychosocial stress (eg, anxiety, depression) [14]

Being given a less hopeful prognosis [15]

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Literature review current through: Nov 2017. | This topic last updated: Aug 31, 2017.
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