Retrospective clinico-statistical studies were performed concerning primary malignant tumors in the oral and maxillofacial regions.The subjects consisted of 195 patients who visited the Department of Dentistry and Oral Surgery,Shinshu University School of Medicine during the 16 years from 1982 to 1997. The results were as follows : 1） The male/female ratio was 1.1:1. The patients ranged in age from 23 to 87 years,with a mean of 64.2 years. 2） Histopathologically, 168 cases (84.8%) were diagnosed as squamous cell carcinoma, 18 cases (9.2%) as salivary gland tumor, 5 cases (2.5%) as alignant melanoma and 9 cases as other tumor. 3） The most commonly affected site in the oral cavity was the tongue (42.0%), followed by the gingival (20.2%) and the buccal mucosa (9.5%). These three sites accounted for about 70%. 4） One hundred sixty-four cases of oral squamous cell carcinomas were classified in T classification as follows :Tis :7 cases (4.3%),T1:31 cases (18.9%), T2:63 cases (38.4%),T3:23 cases (14.0%),T4:40 cases (24.4%). Cervical lymph node metastasis was found in 62 cases (37.8%) and there was no case showing distant metastasis. 5） Stage classification of the 164 cases of oral squamous cell carcinomas showed the following distribution : Stage０ :7 cases (4.2%), Stage I:29 cases (17.3%), Stage II:52 cases (31.0%), StageIII:24 cases (14.3%), Stage IV:56 cases (33.3%). 6） Sixty-five percent of patients with oral squamous cell carcinomas underwent surgery and 40% were treated with a combination modality of surgery, chemotherapy and radiotherapy. 7） The 5-year cumulative survival rate for the total tumors was 70.8%,for squamous cell carcinomas 69.8%, and for saliary gland tumors 100%.
当科における顎口腔領域悪性腫瘍一次症例の臨床統計学的検討
