At present, surgery is the first line of defense against many forms of cancer. Radiotherapy is applied to those tumors that cannot be surgically excised. When surgery or radiotherapy is completed, chemotherapy is undertaken to eradicate remaining cancer cells.
目前局部癌症以外科手術切除為第一線，不易切除的則以放射治療取代，做完手術及放療後，繼續以化學治療消滅無法切除或遠處的癌細胞。