Spindle cell carcinoma of the oral cavity and oropharynx: factors affecting outcome.
BACKGROUND
Spindle cell carcinoma (SpCC) is considered to be a rare variant of squamous cell carcinoma (SCC). The behavior of such tumors is unclear. The aim of this study was to elucidate the treatment and outcome of oral and oropharyngeal SpCC.


METHODS
All the medical records of patients with the diagnosis of SpCC in the oral cavity and oropharynx in our hospital from 1994 to 2005 were reviewed. The clinical features, treatments and survival of the patients were evaluated.


RESULTS
Within the 11-year study period, 18 patients were diagnosed with oral and oropharyngeal SpCC. There were 3 cases of AJCC (American Joint Committee on Cancer) stage I, 3 of stage II, 2 of stage III, 9 of stage IV, and 1 case without definite staging. Twelve patients died of their diseases. The median overall survival time was 8.89 months. The 1-year overall survival rate was 36.7% and the 3-year overall survival rate was 27.5%. In the early stage group, the 1-year and 3-year survival rates were both 100%. In the late stage group, the 1-year survival rate was 9%, and the 3-year survival rate was 0%. The factors influencing overall survival were tumor grade, lymph nodes, metastasis, stage, vascular invasion and distant recurrence. A high local recurrence rate (73.3%) and distant metastasis rate (33.3%) were observed.


CONCLUSIONS
The behavior of SpCC seems to be more aggressive than that of SCC at a similar stage. Setting wider safety margins (> 2 cm) during surgical intervention is suggested. In the case of locoregional recurrence, salvage operation showed some benefit. Seeking an effective chemotherapy protocol is important for the control of distant recurrence.
Su
Hsing-Hao
HH
Department of Otorhinolaryngology, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan, R.O.C.
Chu
Sau-Tung
ST
Hou
Yu-Yi
YY
Chang
Kuo-Ping
KP
Chen
Chia-Jung
CJ
D000328:Adult; D000368:Aged; D002294:Carcinoma, Squamous Cell / Q000401:mortality / Q000473:pathology / Q000601:surgery*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009062:Mouth Neoplasms / Q000401:mortality / Q000473:pathology / Q000601:surgery*; D009959:Oropharyngeal Neoplasms / Q000401:mortality / Q000473:pathology / Q000601:surgery*; D016879:Salvage Therapy