Clinical evidence to support the presence of an oligometastatic state is controversial. However, there is emerging low quality evidence in both the surgical and SABR literature that this state may exist. In a study of over 5200 participants with lung metastases who underwent surgical resection, a 5-year survival of 36% was reported in participants who achieved a complete resection, much higher than would be expected for stage IV disease.3 Similarly, in participants treated with SABR for 1-3 lung metastases from a variety of primary tumors, local control with SABR was 96% at 2-years, and 2-year survival was 39%. Long-term survival has been demonstrated in participants treated for oligometastases with surgery or SABR at several other tumor sites, including liver, brain, bone, and adrenal metastases. The risk of further metastases after ablative treatment is up to 60-80% in some studies. SABR can also be used for further salvage at newly progressive sites (oligoprogression).