Fig. 2From: Characteristics and prognosis of primary pulmonary osteosarcoma: a pooled analysisA nomogram to predict the overall survival in patients with primary pulmonary osteosarcoma one and two years after diagnosis. The concordance index was 0.771 (95% CI 0.691–0.851). Abbreviations: Osteoid, microscopic findings of osteoid tissue in the tumor; OS, overall survival; NA, not availableBack to article page