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Low-dose chemotherapy is being studied/used in the treatment of cancer to avoid the side effects of conventional chemotherapy. Historically, oncologists have used the highest possible dose that the body can tolerate in order to kill as many cancer cells as possible. [1] After high-dose treatments, the body reacts, sometimes quite severely.
Tamoxifen, sold under the brand name Nolvadex among others, is a selective estrogen receptor modulator used to prevent breast cancer in women and men. [13] It is also being studied for other types of cancer. [13] It has been used for Albright syndrome. [14] Tamoxifen is typically taken daily by mouth for five years for breast cancer. [14]
Jordan, V.C. A current view of tamoxifen for the treatment and prevention of breast cancer (Gaddum Memorial Lecture)" British Journal of Pharmacology 110:507-517, 1993. (257 citations as of May 26, 2021). Jordan, V.C. and Morrow, M.M. Tamoxifen, raloxifene and the prevention of breast cancer. Endocrine Reviews 20:253-278, 1999.
Typically a pharmacist prepares the final form of the unit pack or places a lower count of capsules in a small bottle for the customer. In a pharmacy, pharmacists are available to answer questions and to ensure that proper documentation is provided. Internet pharmacies mail the prescribed drugs to the customer; boxes or mailing envelopes are used.
The maximum dose is used, rather than a lower dose, to reduce the number of test subjects (and, among other things, the cost of testing), to detect an effect that might occur only rarely. This type of analysis is also used in establishing chemical residue tolerances in foods. Maximum tolerated dose studies are also done in clinical trials.
Threshold dose is the minimum dose of drug that triggers minimal detectable biological effect in an animal. [1] At extremely low doses, biological responses are absent for some of the drugs. The increase in dose above threshold dose induces an increase in the percentage of biological responses. [2]
Great question that points to a weakness in this article. Tamoxifen's mechanism of action in breast cancer is as a estrogen receptor (ER) antagonist (especially through the ER-alpha isoform). In addition, breast cancers may become resistant to tamoxifen through mutations of the ER which convert tamoxifen from an antagonist into an agonist.
Increased Risk of Solid Cancer with Dose for A-bomb survivors, from BEIR report.Notably, this exposure pathway occurred from essentially a massive spike or pulse of radiation, a result of the brief instant that the bomb exploded, which while somewhat similar to the environment of a CT scan, is wholly unlike the low dose rate of living in a contaminated area such as Chernobyl, where the dose ...