Table 6.
Five-year relative survival rates of patients with SCLC according to stage at lung cancer diagnosis
| Stage | Time (yr) | No. at risk | No. of deaths | Observed survival ratea) | Expected survival rateb) | Relative survival (95% CI) |
|---|---|---|---|---|---|---|
| LD | 0.0–1.0 | 122 | 56 | 0.54 | 0.98 | 0.55 (0.49–0.64) |
| 1.0–2.0 | 66 | 27 | 0.32 | 0.97 | 0.33 (0.25–0.42) | |
| 2.0–3.0 | 39 | 14 | 0.20 | 0.96 | 0.21 (0.14–0.29) | |
| 3.0–4.0 | 25 | 5 | 0.16 | 0.95 | 0.17 (0.11–0.25) | |
| 4.0–5.0 | 20 | 2 | 0.15 | 0.94 | 0.16 (0.10–0.23) | |
| ED | 0.0–1.0 | 213 | 156 | 0.27 | 0.98 | 0.27 (0.21–0.33) |
| 1.0–2.0 | 57 | 41 | 0.08 | 0.97 | 0.08 (0.05–0.12) | |
| 2.0–3.0 | 16 | 6 | 0.05 | 0.96 | 0.05 (0.03–0.08) | |
| 3.0–4.0 | 10 | 1 | 0.04 | 0.95 | 0.04 (0.02–0.08) | |
| 4.0–5.0 | 9 | 1 | 0.04 | 0.95 | 0.04 (0.02–0.07) |
CI, confidence interval; ED, extensive disease; LD, limited disease; SCLC, small cell lung cancer.
a)
Observed survival rate: probability of survival all causes of death in Korean Association of Lung Cancer Registry patients,
b)
Expected survival rate: probability of expected survivors in a comparable cohort of cancer-free general population.