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Table 1 Baseline characteristics of patients with and without PRNN

From: Nasopharyngeal necrosis following intensity-modulated radiation therapy of primary nasopharyngeal carcinoma—incidence rate and predictors of risk

Factor

Non-PRNN*

PRNN

Total

P value*

 

5925(100%)

53(100%)

5978

 

Age (y, median)

   

< 0.001

 < = 55

4767(80.5%)

28(52.8%)

4795(80.2%)

 

 > 55

1158(19.5%)

25(47.2%)

1183(19.8%)

 

Sex

   

0.536

 Male

4298(72.5%)

41(77.4%)

4339(72.6%)

 

 Female

1627(27.5%)

12(22.6%)

1639(27.4%)

 

Smoking

   

0.081

 No

3859(65.1%)

28(52.8%)

3887(65.0%)

 

 Yes

2066(34.9%)

25(47.2%)

2091(35.0%)

 

Drinking

   

1.000

 No

5044(85.1%)

45(84.9%)

5089(85.1%)

 

 Yes

881(14.9%)

8(16.7%)

889(14.9%)

 

Histology, WHO**

   

0.628

 1

119(2.0%)

0(0%)

119(2.0%)

 

 2.1–2.2

5806(98.0%)

53(100%)

5856(98%)

 

Hypertension

   

1.000

 No

5401(91.2%)

49(92.5%)

5450(91.2%)

 

 Yes

524(8.8%)

4(7.5%)

528(8.8%)

 

Diabetes

   

0.002

 No

5714(96.4%)

46(86.8%)

5760(96.4%)

 

 Yes

211(3.6%)

7(13.2%)

218(3.6%)

 

T stage***

   

< 0.001

 T1-2

1872(31.6%)

6(11.3%)

1878(31.4%)

 

 T3-4

4053(68.4%)

47(88.7%)

4100(68.6%)

 

N stage***

   

0.002

 N0-1

3773(63.6%)

30(57.1%)

3803(63.6%)

 

 N2-3

2152(36.4%)

23(42.9%)

2175(36.4%)

 

EBV DNA, copies/ml

   

0.270

 < = 2000

2952(49.8%)

22(41.5%)

2974(49.7%)

 

 > 2000

2973(50.2%)

31(58.5%)

3004(50.3%)

 

Induction Chemotherapy

   

1.000

 No

2803(47.3%)

26(49.1%)

2829(47.3%)

 

 Yes

3122(52.7%)

27(50.9%)

3149(52.7%)

 

Concurrent chemotherapy

   

0.358

 No

1017(17.2%)

6(11.3%)

1023(17.1%)

 

 Yes

4908(82.8%)

47(88.7%)

4955(82.9%)

 

primary tumor volume, cm3

   

< 0.001

 < = 60.5

4188(70.7%)

15(28.3%)

4360(73.0%)

 

 > 60.5

1737(29.3%)

38(71.7%)

1615(27.0%)

 

Radiotherapy treatment time, day

   

0.005

 < = 43

3388(57.2%)

20(37.7%)

3406(57.0%)

 

 > 43

2537(42.8%)

33(62.3%)

2569(43.0%)

 

HGB, g/L

   

0.429

 < = 126.5

847(14.3%)

5(9.4%)

852(14.3%)

 

 > 126.5

5078(85.7%)

48(90.6%)

5126(85.7%)

 

Dynamic ALB, g/L

   

0.013

 < 30

4231(71.4%)

27(50.9%)

4258(71.2%)

 

 30–35

1354(22.9%)

19(35.8%)

1373(23.0%)

 

 > 35

340(57.4%)

7(13.2%)

347(5.8%)

 

CRP, g/mL

   

0.012

 < = 2.6

3934(66.4%)

26(49.1%)

3960(66.2%)

 

 > 2.6

1991(33.6%)

27(50.9%)

2018(33.8%)

 

LDH, U/L

   

0.008

 < = 170

2542(42.9%)

13(24.5%)

2555(42.7%)

 

 > 170

3383(57.1%)

40(75.5%)

3423(57.3%)

 

Prescription doseEQD2, Gy

   

0.002

 < = 72.26

5826(98.3%)

48(90.6%)

5874(98.3%)

 

 > 72.26

99(1.7%)

5(9.4%)

104(1.7%)

 

D0.5ccEQD2, Gy

   

< 0.001

 < = 80.20

4887(84.2%)

20(37.7%)

5007(83.8%)

 

 > 80.20

938(15.8%)

33(62.3%)

971(16.2%)

 

V77.0(V110%), %

   

< 0.001

 < = 0.2

4055(68.4%)

19(35.8%)

4074(68.1%)

 

 > 0.2

1870(31.6%)

34(64.2%)

1904(31.9%)

 
  1. Abbreviations: PRNN Post radiation nasopharyngeal necrosis, EBV EpsteineBarr virus, WHO World Health Organization, N Node, T tumor, HGB Hemoglobin, ALB Albumin, CRP C-reactive protein, LDH Lactate dehydrogenase
  2. *P values are from c2 test or Fisher exact test (for contingency tables with expected frequencies below 5), or ManneWhitney U test (continuous variables)
  3. **WHO type 1 = keratinizing, WHO type 2.1 = nonkeratinizing (differentiated), WHO type 2.2 = nonkeratinizing (undifferentiated)
  4. ***According to the eighth edition of American Joint Committee on Cancer staging system