A Retrospective Study of Malignant Parotid Tumors

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  • Sakamoto Kikuo
    Department of Otolaryngology Head and Neck Surgery, Kurume University School of Medcine
  • Chijiwa Hideki
    Department of Otolaryngology Head and Neck Surgery, Kurume University School of Medcine
  • Miyajima Yoshimi
    Department of Otolaryngology Head and Neck Surgery, Kurume University School of Medcine
  • Umeno Hirohito
    Department of Otolaryngology Head and Neck Surgery, Kurume University School of Medcine
  • Nakashima Tadashi
    Department of Otolaryngology Head and Neck Surgery, Kurume University School of Medcine

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Other Title
  • 耳下腺悪性腫よう７４例の臨床的検討―治療法と成績―
  • ジカセン アクセイ シュヨウ 74レイ ノ リンショウテキ ケントウ チリョウホウ ト セイセキ
  • 治療法と成績

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Abstract

The clinical features of 74 patients (39 men, 35 women; mean age, 62 years) with malignant parotid tumors were retrospectively investigated. According to the TNM Classification, 4 patients were classified as T1, 9 as T2, 6 as T3, and 55 as T4. Fifty cases were staged as N0, 9 as N1, 14 as N2 and 1 as N3. Tumors located in both lobes of the parotid gland were the most frequent type of tumor (49%). Twenty-four percent of the 74 patients exhibited facial nerve palsy before treatment. Facial palsy was found predominantly in cases with a higher T classification or with deep lobe occupation. Histopathologically, sixteen tumor types were observed; mucoepidermoid carcinoma was the most common.<br>The overall five-year and ten-year survival rates determined using the Kaplan-Meier method were 65% and 61%. The factors influencing a poor outcome were T4 classification (p=0.0189), an N+stage (p<0.0001), and facial palsy (p<0.0001). As for the major histopathologic types, the five-year survival rates were 69% for mucoepidermoid carcinoma, 48% for adenocarcinoma, 71% for adenoid cystic carcinoma, and 100% for acinic cell carcinoma and malignant mixed tumor.<br>With respect to the treatment modality, patients who were classified as T1 or T2 and whose tumors were located in the superficial lobe without facial nerve invasion could be satisfactorily treated with only a superficial lobectomy conserving the facial nerve. A total parotidectomy with total removal of the facial nerve seemed necessary for T3 and T4 cases, especially those with adenocarcinoma or mucoepidermoid carcinoma. Modified neck dissection may be necessary for N0 cases, especially those with adenocarcinoma, adenoid cystic carcinoma or undifferentiated carcinoma. Nerve grafting after total nerve resection is recommended for a better quality of life.

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