<unk>  is a form of external beam radiotherapy utilizing beams of protons, neutrons, or atomic nuclei.  The most common type of<unk>  as of 2007 is proton therapy.  Strictly speaking, a photon, used in x-ray or gamma ray therapy can also be considered a<unk> , but generally that distinction is ignored in the context of radiation therapy.  Additionally, electron therapy is generally put in its own category.  Because of this,<unk>  is sometimes referred to as hadron therapy.
In contrast to photons, charged<unk> s deposit most of their energy at a specific depth inside the tissue dependent on the energy of the<unk> s.  This deposition occurs at the Bragg peak.  The advantage of this energy depostion profile is that less energy is deposited into the normal tissue surrounding the target tissue.
Heavy ion therapy is the use of<unk> s more massive than protons or neutrons, such as carbon nuclei for<unk> .
Combined<unk>  refers to treating a tumor with more than one type of<unk>  (e.g. using both proton and carbon ion therapy).
Particle therapy
Asthma spacer
Organocatalysis
Cytoluminescent therapy
Maggot therapy
Exposure Therapy
Voice therapy 
Complementary medicine