1930s public information poster warning of "cancer quacks"<unk> describes any cancer<unk> or practice that is not part of the conventional standard of cancer care. These include special diets and exercises, chemicals, herbs, devices, and manual procedures. Most<unk>  do not have high-quality evidence supporting their use. Concerns have been raised about the safety of some of them. Some have even been found to be unsafe in certain settings. Despite this, many untested and disproven<unk>  are used around the world. Promoting or marketing such<unk>  is illegal in most of the developed world.<unk>  are typically contrasted with experimental cancer<unk>  – science-based<unk> methods – and complementary<unk> , which are non-invasive practices used in combination with conventional<unk>  All approved chemotherapy medications were considered experimental<unk>  before completing safety and efficacy testing. Since the late 19th century, medical researchers have established modern cancer care through the development of chemotherapy, radiation therapy, targeted therapies, and refined surgical techniques. , only 32.9% of cancer patients in the United States died within five years of their diagnosis. Despite their effectiveness, many conventional<unk>  are accompanied by a wide range of side effects, including pain, fatigue, and nausea. Some side effects can even be life-threatening. Many supporters of<unk><unk>  claim increased effectiveness and decreased side effects when compared to conventional<unk> . However, one retrospective cohort study showed that patients using<unk><unk>  instead of conventional<unk>  were 2.5 times more likely to die within five years. Most<unk>  have not been tested in proper clinical trials. Among studies that have been published, the quality is often poor. A 2006 review of 196 clinical trials that studied unconventional cancer<unk>  found a lack of early-phase testing, little rationale for dosing regimens, and poor statistical analyses. These kinds of<unk>  have appeared and vanished throughout history.
Alternative cancer treatments
Experimental cancer treatment
Longevity medicine 
Tobacco harm reduction
Cancer immunoprevention
Cancer rehabilitation
Toxics use reduction
Suicide prevention