Table 1 The characteristics of small cell lung cancer patients
| Â | SEER | MCDB | |
|---|---|---|---|
Total |  | n = 849 | n = 307 |
Sex | Male | 369 (43.5%) | 268 (87.3%) |
Female | 480 (56.5%) | 39 (12.7%) | |
Age | ≤ 65 | 369 (43.5%) | 182 (59.3%) |
> 65 | 480 (56.5%) | 125 (40.7%) | |
Surgery | Lobectomy/ pneumonectomy | 655 (77.1%) | 277 (90.2%) |
Sub-lobectomy | 194 (22.9%) | 30 (9.8%) | |
Radiotherapy | None | 545 (64.2%) | 263 (85.7%) |
Yes | 289 (34.0%) | 44 (14.3%) | |
Unknown | 15 (1.8%) | 0 (0%) | |
Chemotherapy | None | 273 (32.2%) | 100 (32.6%) |
Yes | 576 (67.8%) | 207 (67.4%) | |
Location | Upper lobe | 510 (60.1%) | 170 (55.4%) |
Lower lobe | 263 (31.0%) | 110 (35.8%) | |
Other/ unknown | 76 (9.0%) | 27 (8.8%) | |
Grade | I-II | 47 (5.5%) | 0 (0%) |
III | 312 (36.7%) | 82 (26.7%) | |
IV | 249 (29.3%) | 66 (21.5%) | |
Unknown | 241 (28.5) | 159 (51.8) | |
Examined lymph nodes | ≤ 3 | 195 (23.0%) | 34 (11.1%) |
> 3 | 654 (77.0%) | 273 (88.9%) | |
Tumor size | ≤ 3.0 cm | 649 (76.4%) | 192 (62.5%) |
> 3.0 cm | 200 (23.6%) | 115 (37.5%) | |
pN classification | pN0 | 533 (62.8%) | 149 (48.5%) |
pN1 | 174 (20.5%) | 51 (16.6%) | |
pN2 | 142 (16.7%) | 107 (34.9%) | |
Lymph node ratio | ≤ 0.14 | 628 (74.0%) | 209 (68.1%) |
> 0.14 | 221 (26.0%) | 98 (31.9%) | |
New pN classification | New pN#1 | 402 (47.3%) | 124 (40.4%) |
New pN#2 | 226 (26.6%) | 86 (28.0%) | |
New pN#3 | 221 (26.1%) | 97 (31.6%) | |