<unk>  are used to treat<unk>  in several different ways. Their high-intensity light can be used to shrink or destroy tumors or precancerous growths.<unk>  are most commonly used to treat superficial<unk> s<unk> s on the surface of the body or the lining of internal organs) such as basal-cell skin<unk>  and the very early stages of some<unk> s, such as cervical, penile, vaginal, vulvar, and non-small cell lung<unk> . Ordinary light consists of many wavelengths and spreads in all directions.<unk> light, on the other hand, has a specific wavelength and can be collimated to produce a narrow beam with very high intensity. Because<unk>  can focus very accurately on tiny areas, they can be used for very precise surgical work or for cutting through tissue (in place of a scalpel). Three types of<unk>  are used to treat<unk> : carbon dioxide (CO2)<unk> , argon<unk> , and neodymium:yttrium-aluminum-garnet (Nd:YAG)<unk> .
Lasers in cancer treatment
Biosimilar
Radiation protection
Heteroecious
Correlates of immunity
Research chemical
Virtually safe dose
Cost of drug development