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Table 2 Absolute tissue concentrations (mean ± standard error) measured in thenormal breast at baseline

From: Optical imaging correlates with magnetic resonance imaging breast density and revealscomposition changes during neoadjuvant chemotherapy

  Water (%) Lipid (%) ctO2Hb (µM) ctHHb (µM) ctTHb (µM) stO2 (%) TOI
All
n = 28
21.4 ± 1.3 69.7 ± 1.3 18.0 ± 1.2 5.0 ± 0.2 23.0 ± 1.3 77.2 ± 0.9 1.7 ± 0.2
Pre
n = 17
24.4 ± 1.8c 67.0 ± 1.6b 18.9 ± 1.7 5.3 ± 0.2a 24.2 ± 1.9 76.8 ± 1.1 2.1 ± 0.3b
Post
n = 11
16.6 ± 0.7c 74.0 ± 1.4b 16.6 ± 1.5 4.5 ± 0.2a 21.1 ± 1.6 77.7 ± 1.7 1.0 ± 0.1b
  1. Data are shown for all patients, and for the premenopausal (pre) andpostmenopausal (post) subgroups. ctO2Hb, oxyhemoglobinconcentration; ctHHb, deoxyhemoglobin concentration; ctTHb, total hemoglobinconcentration; stO2, tissue oxygen saturation; TOI, tissue opticalindex. a,b,cA statistically significant difference (Mann-WhitneyU test) between pre- and postmenopausal groups (P <0.05; P < 0.01; P < 0.001, respectively).