Clin Exp Otorhinolaryngol.  2018 Dec;11(4):259-266. 10.21053/ceo.2017.01340.

Prognostic Factors Affecting Surgical Outcomes in Squamous Cell Carcinoma of External Auditory Canal

• Nam GS
• Moon IS
• Kim JH
• Kim SH
• Choi JY
• Son EJ

• KMID: 2439852
• DOI: http://doi.org/10.21053/ceo.2017.01340

Abstract

OBJECTIVES
Carcinomas of the external auditory canal (EAC) are rare, and management remains challenging. Previous studies seeking prognostic factors for EAC cancers included cancers other than carcinomas. In this study, we analyzed the treatment outcomes of, prognostic factors for, and survival rates associated with specifically squamous cell carcinoma (SCC) of the EAC.
METHODS
A retrospective review of 26 consecutive patients diagnosed with SCCs of the EAC in a 10-year period was performed in terms of clinical presentation, stage, choice of surgical procedure, and adjunct therapy. Overall survival (OS) and recurrence-free survival (RFS) were calculated and univariate analysis of prognostic factors was performed.
RESULTS
The median age of the 26 patients with SCCs of the EAC was 63 years (range, 40 to 72 years), and 16 males and 10 females were included. According to the modified University of Pittsburgh staging system, the T stages were T1 in 11, T2 in six, T3 in four, and T4 in five cases. The surgical procedures employed were wide excision in three cases, lateral temporal bone resection (LTBR) in 17, and extended LTBR in four, and subtotal temporal bone resection in two. Two patients underwent neoadjuvant chemotherapy, and two underwent adjuvant chemotherapy. One patient received preoperative radiation therapy, and eleven received postoperative radiation therapy. Of the possibly prognostic factors examined, advanced preoperative T stage and advanced overall stage were significant predictors of RFS, but not of OS.
CONCLUSION
The advanced T stage and overall stage were associated with decreased survival after surgical treatment in patients with SCC of the EAC, highlighting the importance of clinical vigilance and early detection.

Keyword

External Auditory Canal; Ear Neoplasms; Squamous Cell Carcinoma; Temporal Bone

MeSH Terms

Carcinoma, Squamous Cell*
Chemotherapy, Adjuvant
Drug Therapy
Ear Canal*
Ear Neoplasms
Epithelial Cells*
Female
Humans
Male
Retrospective Studies
Survival Rate
Temporal Bone

Figure

• 

  Fig. 1. Kaplan-Meier curves for overall survival (OS) and recurrencefree survival (RFS) in patients with squamous cell carcinoma of the external auditory canal. The 5-year OS was 70.4% and RFS was 61.8%.

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