AUTHOR CONTRIBUTIONS
Conceptualization: SHH, ISP. Data curation: SHH, JL, JWK, HK, DJL, JHK. Formal analysis: SHH. Methodology: SHH, JL. Writing–original draft: SHH. Writing–review & editing: all authors.
Variable | Partial parotidectomy | Superficial or total parotidectomy | P-value |
---|---|---|---|
Number | 22 (28.6) | 55 (71.4) | - |
Age (yr) | 49.3±19 | 51.1±16 | 0.683 |
Sex | 0.943 | ||
Male | 11 (50.0) | 28 (50.9) | |
Female | 11 (50.0) | 27 (49.1) | |
Tumor size (mm) | 2.3±0.9 | 2.5±0.8 | 0.232 |
T stage | 0.053 | ||
T1 | 12 (54.5) | 17 (30.9) | |
T2 | 10 (45.5) | 38 (69.1) | |
Histopathology | 0.050 | ||
Low/intermediate grade | 18 (81.8) | 32 (58.2) | |
High grade | 4 (18.2) | 23 (41.8) | |
Preoperative biopsy | 0.959 | ||
Malignant | 11 (50.0) | 34 (61.8) | |
Benign or indeterminate | 6 (27.3) | 18 (32.7) | |
Undone | 5 (22.7) | 3 (5.5) | |
ECE | 2 (9.1) | 10 (18.2) | 0.491 |
PNI | 1 (4.5) | 6 (10.9) | 0.666 |
LVI | 0 | 8 (14.5) | 0.096 |
Resection margin | 5 (22.7) | 11 (20.0) | 0.765 |
Postoperative complication | 3 (13.6) | 20 (36.4) | 0.049* |
Facial nerve weakness | 1 (4.5) | 10 (18.2) | 0.122 |
Others | 2 (9.1) | 10 (18.2) | 0.491 |
Operation time (min) | 143.2±80.0 | 225.5±112.3 | 0.004* |
Postoperative radiation therapy | 6 (27.3) | 28 (50.9) | 0.059 |
Variable | Number | 5-Year DFS (%) | P-value | 5-Year OS (%) | P-value |
---|---|---|---|---|---|
Age (yr) | 0.520 | 0.017* | |||
≤65 | 63 | 80.4 | 94.2 | ||
>65 | 14 | 59.9 | 83.9 | ||
Sex | 0.292 | 0.215 | |||
Male | 39 | 76.7 | 93.8 | ||
Female | 38 | 77.9 | 90.9 | ||
T stage | 0.344 | 0.312 | |||
T1 | 29 | 83.8 | 95.5 | ||
T2 | 48 | 73.7 | 90.6 | ||
Histopathological grade | 0.006* | 0.574 | |||
Low/intermediate grade | 50 | 84.6 | 92.4 | ||
High grade | 27 | 63.5 | 92.0 | ||
ECE | 0.305 | 0.287 | |||
No | 65 | 91.7 | 92.6 | ||
Yes | 12 | 74.5 | 90.9 | ||
PNI | 0.056 | 0.213 | |||
No | 70 | 77.7 | 94.7 | ||
Yes | 7 | 71.4 | 71.4 | ||
LVI | 0.046* | <0.001* | |||
No | 69 | 79.0 | 96.4 | ||
Yes | 8 | 62.5 | 62.5 | ||
Resection margin | 0.586 | 0.684 | |||
No | 61 | 77.5 | 92.3 | ||
Yes | 16 | 74.9 | 92.3 | ||
Parotidectomy | 0.320 | 0.884 | |||
Partial | 22 | 88.1 | 92.9 | ||
Superficial or total | 55 | 74.1 | 92.1 | ||
Postoperative radiation therapy | 0.225 | 0.998 | |||
No | 43 | 80.6 | 94.4 | ||
Yes | 33 | 72.4 | 89.6 | ||
LN metastasis | 0.010* | 0.147 | |||
No | 59 | 69.4 | 95.8 | ||
Yes | 18 | 57.9 | 81.9 |