Cryotherapy is a form of Focal Therapy. At UCLH, they tend to use it where HIFU is not able to reach the cancerous area(s). However, they sometimes use Nanoknife (Irreversible electroporation), another Focal option. A further option is Focal Brachytherapy, where treatment is directed right into the tumour. Sometimes Focal treatment can be obtained on the NHS but a specialist needs to ascertain whether a form of Focal is right for an individual. Many doctors are not familar with Focal treatments and are unable to offer them, so tend to favour their own specialities.