Table 1. Baseline characteristics of the 479 patients who underwent surgical resection for thymic epithelial tumors.
| Variables | Number of patients (n=479) |
|---|---|
| Age in years (median, range) | 52 [15–84] |
| Sex (male:female) | 251:228 (52.4%:47.6%) |
| Association with MG, n (%) | 93 (19.4) |
| Preoperative treatment, n (%) | |
| None | 433 (90.4) |
| CTx | 44 (9.2) |
| RTx | 2 (0.4) |
| Surgical extent, n (%) | |
| Thymectomy/excision | 376 (78.5) |
| Extended thymectomy | 103 (21.5) |
| Surgical approaches, n (%) | |
| Transsternal | 340 (71.0) |
| VATS or robotic | 139 (29.0) |
| LN sampling or dissection, n (%) | |
| None | 292 (61.0) |
| Yes | 187 (39.0) |
| Number of retrieved LN (median, range) | 4 [1–30] |
| LN metastasis, n (%) | |
| None | 171 (91.4) |
| Yes | 16 (8.6) |
| Type of resection, n (%) | |
| R0-resection | 406 (84.8) |
| R1-resection | 64 (13.4) |
| R2-resection | 9 (1.9) |
| Maximal tumor size in cm (median, range) | 6.0 (0–20.0) |
| Masaoka-Koga stage, n (%) | |
| Stage I | 262 (54.7) |
| Stage IIa | 76 (15.9) |
| Stage IIb | 33 (6.9) |
| Stage III | 93 (19.4) |
| Stage IVa | 7 (1.5) |
| Stage IVb | 8 (1.7) |
| WHO classification, n (%) | |
| A | 33 (6.9) |
| AB | 105 (21.9) |
| B1 | 121 (25.3) |
| B2 | 82 (17.1) |
| B3 | 62 (12.9) |
| C | 76 (15.9) |
| Postoperative treatment, n (%) | |
| None | 260 (54.3) |
| CTx | 204 (42.6) |
| RTx | 12 (2.5) |
| CRTx | 3 (0.6) |
MG, myasthenia gravis; CTx, chemotherapy; RTx, radiation therapy; CRTx, chemoradiation therapy; VATS, video-assisted thoracoscopic surgery; LN, lymph node; WHO, World Health Organization.