From 1965 to 1977

62 patients of carcinoma of the nasal cavities were treated by radiation the- rapy.Our series comprised 33 cases of anaplastic carcinoma;25 cases of squamous cell carcino- ma;3 cases of adenocarcinoma and 1 case of unclassified carcinoma. The clinical staging of our 62 cases

according to Lederman’s TNM Staging

was as follows: T

1.2

N

0

M

0

14 cases;T

3a

b

N

0

M

0

34 cases

&

T

3a

b

N

1

2

3

M

0

14 cases. In our series

52 cases were treated by external irradiation alone;1 cases was treated by external irradiation complemented with intracavitary radium therapy;three cases were given pre- operative irradiation in combination with surgery;and 6 cases were treated by post-operative irradiation. The dosages of the external irradiation were mostly around TDF 82-109 （50-65 Gy/5-6（1/2） weeks）

only 5 cases of squamous cell carcinoma exceeded TDF 120.For N

1

2

3

stage cases

the metastatic cervical lymph nodes were administered the dosages of TDF 65-82 to 12 cases and TDF 107 to 2 cases.No prophylactic irradiation was givan to No cases. The absolute 5-year survival rate of our 62 cases after treatment was 54.8%（34/62）.The 5- year survival rate for those 53 cases treated by radiothreapy alone was54.7%（29/53）

i.e.48.5 % for anaplastic carcinoma

63.2% for squamous cell carcinoma.The 5-year survival rate for our No cases was 64.6%（31/48）

but for N

1

2

3

cases only 21.4%（3/14）. 21 of our 62 cases （33.90%）had local recurrence after treatment

6 recurrent cases were tre- ated again by external irradiation alone or by the combination of preoperative irradiation with surgery.4 of thcse 6 cases survived more than 5 years again after the retreatment

we prefer that those recurrent cases should be retreated. In our series

the incidence of severe late sequalae was high

among 62 cases we had 5 cases of radiation necrosis of bone

mainly due to overdosed irradiation. According to our favourable long term treatment results

we also prefer the radiation thera- py should be the method of choice for the treatment of carcinoma of the nasal cavity.The Opt- imal tumor dose for anaplastic carcinoma would be TDF 82-100

and for squamous cell carcinoma would be TDF 90-110.