Supplementary Table 1. Case of disease recurrences

No. / Age/ Gender / Tumor site / Initial staging / Pathology diagnosis / Pathologic risk factors / Treatment modalities / Extent of surgery / Neck dissection / Recurrence-free survival (months) / Patterns of recurrence / Final status
pT / pN / TNM / PNI / LVI / EPE / RM
1 / 63/F / P / 1 / 0 / I / MEC / - / - / - / PM / OP / Partial / - / 10 / Local / Alive
2 / 40/M / S / 1 / 0 / I / AcinCC / - / - / - / CM / OP / Total / (+) / 38 / Loco-regional / Alive
3 / 59/F / P / 1 / 0 / I / AcinCC / - / (+) / - / CM / OP / Partial / - / 10 / Local* / Dead
4 / 59/F / P / 2 / 0 / II / EMC / - / - / - / CM / OP+RT / Partial / - / 32 / Distant / Alive
5 / 52/M / S / 1 / 0 / I / AdCC / (+) / - / - / NM / OP+RT / Total / - / 27 / Distant / Alive
6 / 29/F / P / 1 / 0 / I / EMC / - / - / - / CM / OP+RT / Partial / - / 4 / Local / Alive
7 / 14/M / S / 1 / 0 / I / MEC / - / - / - / PM / OP / Total / (+) / 27 / Local / Alive
8 / 31/M / P / 3 / 1 / III / AcinCC / - / (+) / (+) / NM / OP / Partial / (+) / 27 / Regional / Alive
9 / 48/M / P / 2 / 0 / II / AdCC / - / - / - / PM / OP+RT / Total / - / 36 / Distant / Alive
10 / 28/F / P / 2 / 0 / II / CxPA / - / - / - / PM / OP / Total / - / 56 / Distant / Alive
11 / 69/M / P / 3 / 1 / III / MEC / - / - / (+) / CM / OP / Partial / (+) / 18 / Regional / Alive
12 / 70/F / M / 3 / 0 / III / AdCC / - / - / (+) / CM / OP+RT / Total / (+) / 12 / Distant / Alive
13 / 41/F / P / 4 / 1 / IV / AdCC / (+) / (+) / (+) / PM / OP+RT / Total / (+) / 18 / Distant / Alive
14 / 38/M / P / 4 / 2 / IV / MEC / (+) / (+) / (+) / PM / OP+RT / Total / (+) / 7 / Loco*-regional / Dead

Tumor site: P: Parotid gland, S: Submanibular gland, M: Minor salivary gland

Pathology diagnosis: MEC: low-grade mucoepidermoid carcinoma, AcinCC: acinic cell carcinoma, EMC: epithelial-myoepithelial carcinoma, AdCC: non-solid type adenoid cystic carcinoma, CxPA: non-invasive type carcinoma ex-pleomorphic adenoma

Pathology risk factors: PNI: perineural invasion, LVI: lymphovascular invasion, EPE: extra-parenchymal extension, RM: resection margin, PM: positive margin, CM: close margin, NM: negative margin

Treatment modalities: OP: Surgery, RT: post-operative radiation treatment

* Recurrences at skull base region