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Abstract

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Purpose : This retrospective study was tried to evaluate the clinical characteristics of
patients, patterns of failure, survival rates, prognostic factors affecting survival, and
treatment related toxicities when non-small cell lung cancer patients was treated by
definitive radiotherapy axone or combined with chemotherapy.
Materials and Methods : We evaluated the treatment results of 70 patients who were
treated by definitive radiation therapy for non-small cell lung cancer at the Department
of Radiation Oncology, Ewha Womans University Hospital, between March 1982 and
April 1996. The number of patients of each stage was 2 in stage 1, 6 in stage 11, 30 in
stage ¥²-A, 29 in stage ¥²-B, 3 in stage ¥³. Radiation therapy was administered by 6
MV linear accelerator and daily dose was 1.8-2.0 Gy and total radiation dose was
ranged from 50.4 Gy to 72.0 Gy with median dose 59.4 Gy. Thirty four patients was
treated with combined therapy with neoadjuvant or concurrent chemotherapy and
radiotherapy, and most of them were administered with the multi-drug combined
chemotherapy including etoposide and cisplatin. The survival rate was calculated with
the Kaplan-Meier methods.
Results : The overall 1-year, 2-year, and 3-year survival rates were 53%, 29%, and
26%, respectively. The median survival time of all patients was 17 months. The
disease-free survival rate for 1-year and 2-year were 23% and 16%, respectively. The
overall 1-year survival rates according to the stage was 100% for stage 1, 80% for
stage ¥±, 61% for stage ¥², and 50% for stage ¥³. The overall 1-year, 2-year, and
3-year survival rates for stage ¥² patients only were 61%, 23%, and 20%, respectively.
The median survival time of stage ¥² patients only was 15 months. The complete
response rates by radiation therapy was 16% and partial response rate was 50%. Thirty
patients (43%) among 70 patients assessed local control at initial 3months follow-up
duration. Twenty four (80%) of these 30 patients was possible to evaluate the pattern of
failure after achievement of local control. And then, treatment failure occured in 14
patients (58%): local relapse in 6 patients (43%), distant metastasis in 6 patients (43%)
and local relapse with distant metastasis in 2 patients (14%). Therefore, 16 patients
(23%) were controlled of disease of primary site with or without distant metastases.
Twenty three Patients (46%) among 50 Patients who were possible to follow-up had
distant metastasis. The overall 1-year survival rate according to the treatment
modalities was 59% in radiotherapy alone and 66% in chemoirradiation group. The
overall 1-year survival rates for stage ¥² patients only was 51% in radiotherapy alone
and 68% in chemoirradiation group which was significant different. The significant
prognostic factors affecting survival rate were the stage and the achievement of local
control for all patients at univariate- analysis. Use of neoadjuvant or concurrent
chemotherapy, use of chemotherapy and the achievement of local control for stage ¥²
patients only were also prognostic factors. The stage, pretreatment performance status,
use of neoadjuvant or concurrent chemotherapy, total radiation dose and the achievement
of local control were significant at multivariate analysis. The treatment-related toxicities
were esophagitis, radiation pneumonitis, hematologic toxicity and dermatitis, which were
spontaneously improved, but 2 patients were died with radiation pneumonitis.
Conclusion : The conventional radiation therapy was not sufficient therapy for
achievement of long-term survival in locally advanced non-small cell lung cancer.
Therefore, aggressive treatment including the addition of appropriate chemotherapeutic
drug to decrease distant metastasis and preoperative radiotherapy combined with
surgery, hyperfractionation radiotherapy or 3-D conformal radiation therapy for increase
local control are needed.

Å°¿öµå

Definitive radiation therapy; Neoadjuvant chemotherapy; Nonsmall cell lung cancer;

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