[Radiotherapy for carcinoma of the buccal mucosa: analysis of prognostic factors].
The radiotherapeutic results of 55 patients with carcinoma of the buccal mucosa were analyzed to determine the prognostic factors and appropriate treatment modality. They were classified into 5 groups according to treatment modality: group A (preoperative radiotherapy followed by surgery), group B (interstitial implant), group C (electron therapy), group D (mainly external radiotherapy) and group E (external radiotherapy followed by mold therapy with remote afterloading system). The overall 5-year survival rates for groups A, B, C, D, E and the entire group were 50%, 61%, 67%, 29%, 25% and 48%, respectively. The cumulative 5-year local control rates for groups A through E were 81%, 94%, 75%, 33% and 25%, respectively. In univariate analysis, T stage (T1-2 vs. T3-4), N stage (N0 vs. N1-3), clinical stage (II vs. III-IV), histologic grade (well differentiated vs. moderately and poorly differentiated) and treatment modality (A-C vs. D-E) were significantly related to overall survival (p < 0.05). Multivariate analysis revealed that treatment modality (groups A-C) and N0 stage were significantly associated with favorable prognosis (p < 0.05). These results suggest that interstitial implants are comparable with surgery for T1 to early T3 lesions, with or without slight invasion to the bucco-alveolar sulci or retromolar areas, that can be treated with a single-plane implant.
Sakai
M
M
Division of Radiation Oncology, Chiba Cancer Center.
Hatano
K
K
Sekiya
Y
Y
Araki
H
H
Ito
H
H
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001918:Brachytherapy; D002294:Carcinoma, Squamous Cell / Q000532:radiotherapy* / Q000556:secondary; D019583:Dose Fractionation, Radiation; D005260:Female; D006801:Humans; D008207:Lymphatic Metastasis; D008297:Male; D008875:Middle Aged; D009061:Mouth Mucosa; D009062:Mouth Neoplasms / Q000473:pathology / Q000532:radiotherapy*; D011379:Prognosis; D011882:Radiotherapy, High-Energy; D012189:Retrospective Studies; D016896:Treatment Outcome