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Toxicity of initial treatment must be
considered, independently of blood cell
counts that may be misleading!
time
relative cell number
high dose/toxicity
peripheral cells
stem cells
stimulated
transit
proliferation
stem cells
time
relative cell number
low dose/toxicity
peripheral cells
stimulated
transit
proliferation
Earlier recovery of peripheral cell number does not reflect recovery of
stem cell population (
i.e.
restoration of radiation tolerance)