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But National Breast Cancer Centre director Dr Helen Zorbas says those patients are identifiable, and there is no need to panic.
"The benefits of tamoxifen are extremely significant for women with early breast cancer who have these oestrogen-receptor positive receptors," Dr Zorbas said.
In pathology, a carcinogen is any substance or agent that promotes cancer. Carcinogens are also often, but not necessarily, mutagens or teratogens.
Carcinogens cause cancer by altering DNA in cells, interfering with normal biological processes.
Because it acts as an estrogen blocker, tamoxifen is prescribed to protect breast cancer patients whose tumors are estrogen positive.
Because these cancers require estrogen to grow, treatment standards —after surgery—have included cutting down the supply of estrogen either through drugs or through removal of the ovaries.