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Table 2 Antioxidants in healthy controls and patients, both pre- and post radiotherapy

From: Pre-radiotherapy plasma carotenoids and markers of oxidative stress are associated with survival in head and neck squamous cell carcinoma patients: a prospective study

Antioxidantsa   Controls Patients
    Pre-radiotherapyb Post-radiotherapyc
Carotenoids
(nmol/L)
Lutein 142.5 95.6d 51.0d
  Zeaxanthin 35.6 22.4d 12.2d
  β-cryptoxanthin 131.3 60.3d 27.5d
  α-carotene 107.6 61.3d 56.7e
  β-carotene 374.7 241.0d 229.5
  Lycopene 533.3 243.9d 124.6d
  Total carotenoids 1325.1 703.1d 474.5d
Tocopherols
(μmol/L)
δ-tocopherol 0.030 0.080d 0.042e
  β-tocopherol 0.419 0.466 0.362d
  γ-tocopherol 1.70 1.72 1.06d
  α-tocopherol 28.3 25.7e 22.5d
  Total tocopherols 30.5 28.0 23.9d
Vitamin C
(μmol/L)
Ascorbic acid 46.8 31.9d 23.3d
Total antioxidant capacity
(μmol/L)
FRAP 1055 988e 979
  Modified FRAP 336 170d 166
Total GSH
(μmol/L)
  5.94 5.87 5.63
Total cysteine
(μmol/L)
  247.1 236.6e 235.3
GSH redox potential
(mV)
  n.a. -148 -147
  1. aMean values
  2. bPre-radiotherapy levels are compared with healthy controls after adjusting for age and BMI
  3. cPre- and post- radiotherapy levels are compared
  4. dp < 0.001, ep < 0.05
  5. n.a. = not available