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Kaplan-Meier curve showing time to polymetastatic conversion of: A) patients with cumulative tumor volume (cumGTV) ≤ 10 cc stratified to number of oligometastases (1 versus 2–3); B) patients with cumGTV > 10 cc stratified to number of oligometastases (1 versus 2–3); C) risk classes stratification of polymetastatic conversion.
