Table 1.

Niibe-Onishi-Chang classification.

Favorable	Intermediate		Unfavorable
	Relatively favorable	Relatively unfavorable
Oligorecurrence  Site no. 1-2 NSCLC (brain and adrenal gland) Colon and rectum cancer (lung and liver) Renal cell cancer	oligo-recurrence  site no. 1-2 breast cancer (bone, lung, and liver) SCLC (brain) site no. 3–5 NSCLC (brain and adrenal gland) colon and rectum cancer (lung and liver) renal cell cancer	oligo-recurrence  site no. 3–5 breast cancer (bone, lung, and liver) SCLC (brain)	Oligometastases and oligo-recurrence  pancreatic cancer (any site) melanoma (any site) sarcoma (any site)
	sync-oligometastases  site no. 1-2 NSCLC (brain and adrenal gland) colon and rectum cancer (lung and liver) renal cell cancer	sync-oligometastases  site no. 3–5 NSCLC (brain and adrenal gland) colon and rectum cancer (lung and liver) breast cancer (bone, lung, and liver)	polymetastases