A machine outside the body directs radiation, in a focused beam, toward the tumour or cancer cells.
A radioactive substance is contained in a seed, wire, needle or catheter that is then implanted in the body, directly inside the tumour or as close to it as possible.
A nuclear medicine technique that uses radioactive substances that bind to tumours when injected into a patient, delivering radiation directly to the tumour. The most common form of this treatment is called peptide receptor radionuclide therapy (PRRT), which uses radiolabelled octreotide that specifically binds to NETs. Radiolabelled MIBG is also occasionally used to treat some types of NETs.

More detailed information on PRRT