Improved local control with higher doses of radiation in large-volume stage III non-small-cell lung cancer.
OBJECTIVE
It has been suggested that larger tumor volume is associated with poor survival in patients with non-small-cell lung cancer (NSCLC). We investigated whether high-dose radiation improved local control in patients with large-volume Stage III NSCLC.


METHODS
Seventy-two patients with Stage III NSCLC and gross tumor volumes (GTV) of greater than 100 cc were treated with three-dimensional conformal radiotherapy (3D-CRT). Patients were divided into two groups: those treated to less than 64 Gy (37 patients) and those treated to 64 Gy or higher (35 patients).


RESULTS
The 1-year and 2-year local failure rates were 27% and 47%, respectively, for Stage III patients treated to 64 Gy or higher, and 61% and 76%, respectively, for those treated to less than 64 Gy (p = 0.024). The median survival time for patients treated to 64 Gy or higher was 20 months vs. 15 months for those treated to less than 64 Gy (p = 0.068). Multivariate analysis revealed that dose and GTV are predictors of local failure-free survival. A 10 Gy increase in dose resulted in a 36.4% decreased risk of local failure.


CONCLUSIONS
Our data suggest that administration of higher doses using 3D-CRT improves local control in Stage III NSCLC patients with large GTVs.
Rengan
Ramesh
R
Department of Radiation Oncology, Memorial Sloan-Kettering Cancer Center, New York, NY 10021, USA.
Rosenzweig
Kenneth E
KE
Venkatraman
Ennapadam
E
Koutcher
Lawrence A
LA
Fox
Jana L
JL
Nayak
Reena
R
Amols
Howard
H
Yorke
Ellen
E
Jackson
Andrew
A
Ling
C Clifton
CC
Leibel
Steven A
SA
D000328:Adult; D000367:Age Factors; D000368:Aged; D002289:Carcinoma, Non-Small-Cell Lung / Q000401:mortality / Q000532:radiotherapy*; D006801:Humans; D008175:Lung Neoplasms / Q000401:mortality / Q000532:radiotherapy*; D008875:Middle Aged; D009367:Neoplasm Staging; D011879:Radiotherapy Dosage; D020266:Radiotherapy, Conformal; D012044:Regression Analysis