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Serum levels of (a) baseline cortisol and (b) evening cortisol. The levels of baseline cortisol declined after RT (p = 0.007) by the paired t-test. The levels of evening cortisol in the 2 Gy group decreased with borderline significance (p = 0.05). ** Differences were significant at the 0.01 level (2-tailed). Abbreviations: RT, radiotherapy.
