Oligometastases is the state that cancer patients with 1 - 5 recurrence or metastastic lesions which could be treated by local therapy directly, often combined with sophisticated systemic therapy. However, the status of primary lesions the most influence the outcomes of oligometastases. Then, I and Prof. Chang JY, tenure Associate Professor at MD Anderson Cancer Center, TX, USA proposed that oligometastases are classified as oligo-recurrence and sync-oligometastases. Oligo-recurrence is the state of oligometastases with primary lesions contorolled. Sync-oligometastases is the state of oligometastases with active primary lesions.

http://www.ncbi.nlm.nih.gov/pubmed/22966429