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Table 1 Clinical characteristics of patients and SPNs

From: Differentiation of primary lung cancer from solitary lung metastasis in patients with colorectal cancer: a retrospective cohort study

  LC (n = 70) LM (n = 129) P value
Age (years) 68.5 ± 8.15 64.6 ± 10.7 0.004
 Male (years) 69.8 ± 6.56 65.3 ± 9.9  
 Female (years) 66.3 ± 10.1 63.1 ± 12.2  
Sex (male/female) 44/26 87/42 0.515
History of smoking 37 (52.9) 49 (38) 0.043
Index tumor location    0.003
 Colon 41 (58.6) 47 (36.4)  
 Rectum 29 (41.4) 82 (63.6)  
Index tumor stage    < 0.001
 Stages I–II 53 (75.7) 29 (22.5)  
 Stages III–IV 17 (24.3) 100 (77.5)  
Chronicity of SPNs    0.004
 Synchronous 18 (25.7) 13 (10.1)  
 Metachronous 52 (74.3) 116 (89.9)  
Histopathology of SPNs   129 (100) ++N/A
 Metastatic  
 Adenocarcinoma 55 (78.6)
 Squamous cell carcinoma 14 (20)
 Small cell carcinoma 1 (1.4)
  1. Values in parentheses are percentages. Values are presented as mean ± standard deviation where applicable. Note: significant P values are shown in bold
  2. LC lung cancer, LM lung metastases, SPN solitary pulmonary nodule, CRC colorectal cancer
  3. ++N/A, not applicable