Summary
Idarubicin has an established place in the treatment of acute myelogenous leukaemia but is not widely used in the treatment of adult solid tumours. Unlike the anthracyclines now used to treat solid tumours, idarubicin has the advantage of being active after oral administration. In preclinical studies, idarubicin was active against human adenocarcinoma cell lines, including some that were resistant to doxorubicin. This activity was confirmed against human tumour xenografts in vivo.
Oral idarubicin is active against advanced breast cancer. The response rate is 24% and the drug is generally well tolerated. Both 1- and 3-day schedules of administration appear to be equally effective. Response rates are higher when oral idarubicin is given in combination with oral cyclophosphamide (44%). The combination of oral idarubicin with cyclophosphamide and fluorouracil is also tolerated well and has a 53% response rate. Two randomised studies, both small and without quality of life evaluation, compared oral idarubicin with doxorubicin. In the first study, the 2 treatments were equally effective but idarubicin had fewer side effects, while in the second, doxorubicin had a significantly higher response rate than idarubicin. Oral idarubicin has not shown useful activity in the other solid tumours against which it has been tested [small cell lung cancer and non-small cell lung cancer, ovarian, stomach, colorectal and prostatic cancer, melanoma and AIDS-related Kaposi’s sarcoma].
It is likely that idarubicin is less active but also better tolerated than doxorubicin in solid tumours. Oral idarubicin may, therefore, have a place in the palliative treatment of advanced breast cancer. It may be particularly appropriate for elderly patients or those who have difficulty tolerating intravenous treatment. This should be explored further in trials that include quality of life studies. At present, a role for oral idarubicin in the treatment of other solid tumours has not been established. However, alternative schedules of administration and means of controlling the absorption of oral idarubicin are worthy of investigation.
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Twelves, C.J. Oral Idarubicin in Solid Tumour Chemotherapy. Clin. Drug Invest. 9 (Suppl 2), 39–54 (1995). https://doi.org/10.2165/00044011-199500092-00007
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DOI: https://doi.org/10.2165/00044011-199500092-00007