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MO23 - Radiotherapy II: Lung Toxicity, Target Definition and Quality Assurance (ID 107)
- Event: WCLC 2013
- Type: Mini Oral Abstract Session
- Track: Radiation Oncology + Radiotherapy
- Presentations: 1
MO23.11 - DART - bid (dose-Differentiated Accelerated Radiation Therapy, 1.8 Gy twice daily): A novel therapeutic approach for locoregionally advanced, nonresected non-small cell lung cancer (ID 2826)
10:30 - 12:00 | Author(s): K. Dagn
A modern treatment approach for non-resected NSCLC comprises radiation dose intensification and short overall treatment times. We report on patients treated within a prospective trial, correlating doses to tumor volume, combined with chemotherapy sequentially.
Radiation doses to primary tumors were aligned along increasing tumor size within 4 groups (<2.5 cm/ 2.5-4.5 cm/ 4.5-6.0 cm/ >6.0 cm; mean number of three perpendicular diameters). ICRU-doses of 73.8 Gy/ 79.2 Gy/ 84.6 Gy/ 90.0 Gy, respectively, were applied. Macroscopically involved nodes were treated with a median dose of 59.4 Gy, nodal sites about 6 cm cranial to involved nodes electively with 45 Gy. Fractional doses were 1.8 Gy twice daily (bid). 2 cycles chemotherapy were given before radiotherapy; the interval between chemotherapy and radiotherapy was preferentially shorter than 8 days. With a median follow up time of 56.1 months (range 43.2 – 97.1 ) for patients alive, mature results for locoregional tumor control, survival and toxicity are presented.
Between 2004 and 2009,123 continuously referred, unselected patients with 127 histologically/ cytologically proven NSCLC were enrolled; Stage II: 6 pts.; IIIA: 70 pts.; IIIB: 47 pts. Weight loss >5%/ 3 months: 26%; Karnofsky Index ≤ 70%: 46% of the patients. The local tumor control rate at 2-/ 5 years is 73%/ 70%, respectively; the regional tumor control rate 91%/ 89%, respectively. The median overall survival time is 24.6 months, the 2- and 5-year overall survival rates are 52% and 19%, respectively. 2 treatment-related deaths (progressive pulmonary fibrosis) occurred in patients with pre-existing pulmonary fibrosis. Further toxicity was mild or moderate: Pneumonitis grade 2/ 3 (n=10/ 6); esophagitis grade 2/ 3 (n=16/ 7). Lung late grade 2 (n=13), esophagus late grade 3 (n=1).
Locoregional tumor control is high; as are survival times for this unselected patient cohort. In all outcome parameters DART-bid seems to compare favourably with simultaneous chemo-radiotherapies, at present considered ‘state of the art’; simultaneous treatments however are applicable only to a minority of referred patients, patients in good general condition.
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