Table 1.

Clinical and radiation treatment characteristics

AllNo CHNon-DDR CHDDR CH
N = 2195n = 1691n = 346n = 158
Sex     
Female 1167 (53.2%) 926 (79.3%) 169 (14.5%) 72 (6.17%) 
Male 1028 (46.8%) 765 (74.4%) 177 (17.2%) 86 (8.37%) 
Age, y 60.7 (51.2-69.1) 58.2 (48.4-66.7) 68.4 (60.0-73.4) 69.0 (62.3-74.7) 
Primary tumor subtype     
Breast carcinoma 395 (18.0%) 325 (82.3%) 52 (13.2%) 18 (4.56%) 
Cancer of unknown primary 66 (3.01%) 44 (66.7%) 12 (18.2%) 10 (15.2%) 
Colorectal cancer 155 (7.06%) 126 (81.3%) 21 (13.5%) 8 (5.16%) 
Endometrial cancer 72 (3.28%) 47 (65.3%) 12 (16.7%) 13 (18.1%) 
Esophagogastric carcinoma 93 (4.24%) 68 (73.1%) 14 (15.1%) 11 (11.8%) 
Glioma 162 (7.38%) 141 (87.0%) 17 (10.5%) 4 (2.47%) 
Head and neck carcinoma 138 (6.29%) 108 (78.3%) 20 (14.5%) 10 (7.25%) 
Non–small cell lung cancer 325 (14.8%) 234 (72.0%) 65 (20.0%) 26 (8.00%) 
Other 399 (18.2%) 310 (77.7%) 65 (16.3%) 24 (6.02%) 
Pancreatic cancer 83 (3.78%) 61 (73.5%) 13 (15.7%) 9 (10.8%) 
Prostate cancer 160 (7.29%) 113 (70.6%) 34 (21.2%) 13 (8.12%) 
Soft tissue sarcoma 97 (4.42%) 81 (83.5%) 12 (12.4%) 4 (4.12%) 
Thyroid cancer 50 (2.28%) 33 (66.0%) 9 (18.0%) 8 (16.0%) 
Days between RT and blood draw 267 (36.0-834) 254 (29.5-808) 355 (59.0-101) 212 (60.0-565) 
Modality     
IMRT 787 (35.9%) 608 (77.3%) 121 (15.4%) 58 (7.37%) 
3D 308 (14.0%) 238 (77.3%) 41 (13.3%) 29 (9.42%) 
Conventional 46 (2.10%) 37 (80.4%) 6 (13.0%) 3 (6.52%) 
VMAT 263 (12.0%) 200 (76.0%) 42 (16.0%) 21 (7.98%) 
Multiple 560 (25.5%) 438 (78.2%) 85 (15.2%) 37 (6.61%) 
Unknown 231 (10.5%) 170 (73.6%) 51 (22.1%) 10 (4.33%) 
Anatomic site     
Abdomen 124 (5.65%) 95 (76.6%) 17 (13.7%) 12 (9.68%) 
Arm/leg 49 (2.23%) 40 (81.6%) 6 (12.2%) 3 (6.12%) 
Brain 226 (10.3%) 189 (83.6%) 25 (11.1%) 12 (5.31%) 
Chest wall/breast 282 (12.8%) 220 (78.0%) 48 (17.0%) 14 (4.96%) 
Head/neck 262 (11.9%) 199 (76.0%) 44 (16.8%) 19 (7.25%) 
Multiple 429 (19.5%) 323 (75.3%) 66 (15.4%) 40 (9.32%) 
Pelvis 303 (13.8%) 230 (75.9%) 50 (16.5%) 23 (7.59%) 
Prostate 77 (3.51%) 58 (75.3%) 16 (20.8%) 3 (3.90%) 
Rib/scapula/sternum 7 (0.32%) 5 (71.4%) 1 (14.3%) 1 (14.3%) 
Spine 118 (5.38%) 102 (86.4%) 13 (11.0%) 3 (2.54%) 
Thorax 174 (7.93%) 118 (67.8%) 31 (17.8%) 25 (14.4%) 
Unknown 144 (6.56%) 112 (77.8%) 29 (20.1%) 3 (2.08%) 
Chemotherapy modality     
Alkylating agent 600 (27.33%) 490 (81.66%) 77 (12.83%) 33 (5.50%) 
Antimetabolite 769 (35.03%) 571 (74.25%) 131 (17.03%) 67 (8.71%) 
Carboplatin 461 (21.00%) 321 (69.63%) 70 (15.18%) 70 (15.18%) 
Cisplatin 447 (20.36%) 338 (75.61%) 66 (14.76%) 43 (9.61%) 
Immune therapy 175 (7.97%) 131 (74.85%) 29 (16.57%) 15 (8.57%) 
Microtubule damaging 133 (6.05%) 114 (85.71%) 15 (11.27%) 4 (3.00%) 
No chemotherapy 436 (19.86%) 344 (78.90%) 82 (18.81%) 10 (2.29%) 
Other cytotoxic therapy 24 (1.09%) 22 (91.66%) 2 (8.33%) 0 (0.00%) 
Oxaliplatin 273 (12.43%) 208 (76.19%) 43 (15.75%) 22 (8.05%) 
Radiopharmaceutical 39 (1.77%) 24 (61.53%) 8 (20.51%) 7 (17.94%) 
Targeted therapy 558 (25.42%) 443 (79.39%) 77 (13.79%) 38 (6.81%) 
Taxane 764 (34.80%) 575 (75.26%) 111 (14.52%) 78 (10.20%) 
Topoisomerase I inhibitor 186 (8.47%) 140 (75.26%) 23 (12.36%) 23 (12.36%) 
Topoisomerase II inhibitor 542 (24.69%) 418 (77.12%) 80 (14.76%) 44 (08.11%) 
AllNo CHNon-DDR CHDDR CH
N = 2195n = 1691n = 346n = 158
Sex     
Female 1167 (53.2%) 926 (79.3%) 169 (14.5%) 72 (6.17%) 
Male 1028 (46.8%) 765 (74.4%) 177 (17.2%) 86 (8.37%) 
Age, y 60.7 (51.2-69.1) 58.2 (48.4-66.7) 68.4 (60.0-73.4) 69.0 (62.3-74.7) 
Primary tumor subtype     
Breast carcinoma 395 (18.0%) 325 (82.3%) 52 (13.2%) 18 (4.56%) 
Cancer of unknown primary 66 (3.01%) 44 (66.7%) 12 (18.2%) 10 (15.2%) 
Colorectal cancer 155 (7.06%) 126 (81.3%) 21 (13.5%) 8 (5.16%) 
Endometrial cancer 72 (3.28%) 47 (65.3%) 12 (16.7%) 13 (18.1%) 
Esophagogastric carcinoma 93 (4.24%) 68 (73.1%) 14 (15.1%) 11 (11.8%) 
Glioma 162 (7.38%) 141 (87.0%) 17 (10.5%) 4 (2.47%) 
Head and neck carcinoma 138 (6.29%) 108 (78.3%) 20 (14.5%) 10 (7.25%) 
Non–small cell lung cancer 325 (14.8%) 234 (72.0%) 65 (20.0%) 26 (8.00%) 
Other 399 (18.2%) 310 (77.7%) 65 (16.3%) 24 (6.02%) 
Pancreatic cancer 83 (3.78%) 61 (73.5%) 13 (15.7%) 9 (10.8%) 
Prostate cancer 160 (7.29%) 113 (70.6%) 34 (21.2%) 13 (8.12%) 
Soft tissue sarcoma 97 (4.42%) 81 (83.5%) 12 (12.4%) 4 (4.12%) 
Thyroid cancer 50 (2.28%) 33 (66.0%) 9 (18.0%) 8 (16.0%) 
Days between RT and blood draw 267 (36.0-834) 254 (29.5-808) 355 (59.0-101) 212 (60.0-565) 
Modality     
IMRT 787 (35.9%) 608 (77.3%) 121 (15.4%) 58 (7.37%) 
3D 308 (14.0%) 238 (77.3%) 41 (13.3%) 29 (9.42%) 
Conventional 46 (2.10%) 37 (80.4%) 6 (13.0%) 3 (6.52%) 
VMAT 263 (12.0%) 200 (76.0%) 42 (16.0%) 21 (7.98%) 
Multiple 560 (25.5%) 438 (78.2%) 85 (15.2%) 37 (6.61%) 
Unknown 231 (10.5%) 170 (73.6%) 51 (22.1%) 10 (4.33%) 
Anatomic site     
Abdomen 124 (5.65%) 95 (76.6%) 17 (13.7%) 12 (9.68%) 
Arm/leg 49 (2.23%) 40 (81.6%) 6 (12.2%) 3 (6.12%) 
Brain 226 (10.3%) 189 (83.6%) 25 (11.1%) 12 (5.31%) 
Chest wall/breast 282 (12.8%) 220 (78.0%) 48 (17.0%) 14 (4.96%) 
Head/neck 262 (11.9%) 199 (76.0%) 44 (16.8%) 19 (7.25%) 
Multiple 429 (19.5%) 323 (75.3%) 66 (15.4%) 40 (9.32%) 
Pelvis 303 (13.8%) 230 (75.9%) 50 (16.5%) 23 (7.59%) 
Prostate 77 (3.51%) 58 (75.3%) 16 (20.8%) 3 (3.90%) 
Rib/scapula/sternum 7 (0.32%) 5 (71.4%) 1 (14.3%) 1 (14.3%) 
Spine 118 (5.38%) 102 (86.4%) 13 (11.0%) 3 (2.54%) 
Thorax 174 (7.93%) 118 (67.8%) 31 (17.8%) 25 (14.4%) 
Unknown 144 (6.56%) 112 (77.8%) 29 (20.1%) 3 (2.08%) 
Chemotherapy modality     
Alkylating agent 600 (27.33%) 490 (81.66%) 77 (12.83%) 33 (5.50%) 
Antimetabolite 769 (35.03%) 571 (74.25%) 131 (17.03%) 67 (8.71%) 
Carboplatin 461 (21.00%) 321 (69.63%) 70 (15.18%) 70 (15.18%) 
Cisplatin 447 (20.36%) 338 (75.61%) 66 (14.76%) 43 (9.61%) 
Immune therapy 175 (7.97%) 131 (74.85%) 29 (16.57%) 15 (8.57%) 
Microtubule damaging 133 (6.05%) 114 (85.71%) 15 (11.27%) 4 (3.00%) 
No chemotherapy 436 (19.86%) 344 (78.90%) 82 (18.81%) 10 (2.29%) 
Other cytotoxic therapy 24 (1.09%) 22 (91.66%) 2 (8.33%) 0 (0.00%) 
Oxaliplatin 273 (12.43%) 208 (76.19%) 43 (15.75%) 22 (8.05%) 
Radiopharmaceutical 39 (1.77%) 24 (61.53%) 8 (20.51%) 7 (17.94%) 
Targeted therapy 558 (25.42%) 443 (79.39%) 77 (13.79%) 38 (6.81%) 
Taxane 764 (34.80%) 575 (75.26%) 111 (14.52%) 78 (10.20%) 
Topoisomerase I inhibitor 186 (8.47%) 140 (75.26%) 23 (12.36%) 23 (12.36%) 
Topoisomerase II inhibitor 542 (24.69%) 418 (77.12%) 80 (14.76%) 44 (08.11%) 

3D, 3-dimensional; IMRT, intensity modulated radiation therapy; VMAT, volumetric modulated arc therapy.

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