From: Toxicity and outcomes of thoracic re-irradiation using stereotactic body radiation therapy (SBRT)
SBRT Characteristics | Total | Overlap with prior RT | No overlap |
---|---|---|---|
N = 39 | N = 22 | N = 17 | |
Median BED10 , Gy (range) | 70 (43–180) | 48 (43–106) | 106 (58–180) |
BED10 ≥ 100 Gy, N (%) | 15 (38) | 4 (18) | 11 (65) |
60 Gy in 3 fr (BED10 = 180 Gy) | 3 | ||
54 Gy in 3 fr ( BED10 = 151 Gy) | 4 | ||
48 Gy in 4 fr ( BED10 = 106 Gy) | 8 | ||
BED10 < 100 Gy, N (%) | 24 (62) | 18 (82) | 6 (35) |
40-45 Gy in 5 fr ( BED10 = 72-86 Gy) | 4 | ||
20-22 Gy in 1 fr ( BED10 = 60-70 Gy) | 4 | ||
32-35 Gy in 4–5 fr ( BED10 = 54-59 Gy) | 4 | ||
27.5-30 Gy in 5 fr ( BED10 = 43-48 Gy) | 12 | ||
Median PTV size, cm3 (range) | 67 (17–473) | 117 (20–473) | 45 (17–197) |
Median GTV size, cm3 (range) | 19 (0.7-227) | 43 (2–227) | 6 (0.7-74) |
Median ipsilateral lung mean dose, Gy (range) | 6.3 (1.7-13.1) | 4.8 (1.7-13.1) | 6.6 (1.7-13.1) |
Median combined lung mean dose, Gy (range) | 3.2 (0.8-7.2) | 3.1 (1.1-6.2) | 4.3 (0.8-7.2) |
Median ipsilateral lung V20, % (range) | 10 (2–30) | 10 (2–30) | 12 (3–25) |
Median combined lung V20, % (range) | 5 (1–12) | 5 (1–10) | 5 (2–12) |