Research Article
Prediction of Solitary Plasmacytoma of Bone in Elderly Patients: A Nomogram and a Risk Classification System for Overall Survival
Table 1
Patient cohort characteristics.
| | Variables (%) | Training cohort () | Validation cohort () |
| | Age, year | | | | 60-70 | 394 (47.6) | 170 (48.3) | | 71-82 | 319 (38.5) | 137 (38.9) | | >82 | 115 (13.9) | 45 (12.8) | | Sex | | | | Female | 324 (39.1) | 145 (41.2) | | Male | 504 (60.9) | 207 (58.8) | | Race | | | | Black | 117 (14.1) | 36 (10.2) | | White | 656 (79.2) | 301 (85.5) | | Others | 55 (6.6) | 15 (4.3) | | Marital status | | | | No | 271 (32.7) | 130 (36.9) | | Yes | 557 (67.3) | 222 (63.1) | | Primary site | | | | Trunk | 624 (75.4) | 284 (80.7) | | Extremities | 129 (15.6) | 41 (11.6) | | Facial/skull bone | 75 (9.1) | 27 (7.7) | | Grade | | | | I/II | 11 (1.3) | 1 (0.3) | | III/IV | 15 (1.8) | 6 (1.7) | | Pre-B cell | 802 (96.9) | 345 (98.0) | | Stage | | | | Localized | 683 (82.5) | 291 (82.7) | | Distant | 145 (17.5) | 61 (17.3) | | Surgery | | | | No | 646 (78.0) | 282 (80.1) | | Yes | 182 (22.0) | 70 (19.9) | | Chemotherapy | | | | No | 666 (80.4) | 278 (79.0) | | Yes | 162 (19.6) | 74 (21.0) | | Radiotherapy | | | | No | 187 (22.6) | 87 (24.7) | | Yes | 641 (77.4) | 265 (75.3) |
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