Yes, as other have pointed out. I want to add, you also sometimes see spontaneous remission of distant lesions caused by local treatment, e.g. radiation therapy

Yes, as other have pointed out. I want to add, you also sometimes see spontaneous remission of distant lesions caused by local treatment, e.g. radiation therapy. There is research into exacerbating the tumor "auto-vaccination" by pretreating the lesion with immuno-stimulants. Btw. 'full remission' doesn't mean cured, but clinical clearance or stagnation. Immune reactions may be limited to a major branch on the individual tree of lif.. death and other subclinical branches may emerge years later. There are other cancers which may feature very high tissue differentiation/maturation (early) and are dependent on a certain trigger. E.g. treating heliobacter pylori or chlamydia with antibiotics, may cause full remission in MALT lymphoma.