Table 1.
The characteristics of the participants
| Characteristics | N | Percentage |
|---|---|---|
| Age | ||
| ＜65 y | 46 | 37.7 |
| ≥65 y | 76 | 62.3 |
| Sex | ||
| Male | 97 | 79.5 |
| Female | 25 | 20.5 |
| Smoking status | ||
| Present or former smoker | 44 | 36.1 |
| Non‐smoker | 36 | 29.5 |
| Unknown | 42 | 34.4 |
| Subtype | ||
| SCLC | 111 | 91.0 |
| Combined SCLC | 11 | 9.0 |
| Source of samples | ||
| Primary | 107 | 87.7 |
| Metastases | 15 | 12.3 |
| MSI status | ||
| MSS/MSI‐L | 111 | 91.0 |
| MSI‐H | 0 | 0.0 |
| Unsure | 11 | 9.0 |
| TMB status | ||
| <10 muts/Mb | 66 | 54.1 |
| ≥10 muts/Mb | 56 | 45.9 |
| 10‐16 muts/Mb | 37 | 30.3 |
| 16‐20 muts/Mb | 8 | 6.6 |
| ≥20 muts/Mb | 11 | 9.0 |
| Stages | ||
| Ⅰ | 8 | 6.6 |
| Ⅱ | 4 | 3.3 |
| Ⅲ | 14 | 11.5 |
| Ⅳ | 25 | 20.5 |
| Unknown | 71 | 58.2 |
| Total | 122 | |
Abbreviations: SCLC, small cell lung cancer; TMB, tumor mutation burden.