compare idealised progression in solid tumors
(Zeit - time)
(Zellverdopplungen - doubling of numer of cells)
Chemotherapy in the specific sense is the treatment of cancer with cytostatic/cytotoxic drugs.
In the wider sense chemotherapy is the use of toxic substances to get rid of certain microorganisms or neoplastic cells in a way that is as targeted as possible. This "selective toxicity" was first postulated by the "inventor of chemotherapy" Paul Ehrlich.
Source: Armin Kübelbeck via wikipedia
