Jenny Jones, 62, said she has been taking a daily 400 ml dose of milk from an anonymous donor after being diagnosed with multiple myeloma, or bone marrow cancer, seven months ago.
She said her cancer levels had reduced significantly after taking a month of daily doses of breast milk, according to a local media report.
Her decision has been supported by doctors at John Flynn private hospital and the mater Hospital in Brisbane where she is being treated.
Breast milk has been proven to help build immunity in newborn babies and is a unique nutritional source that cannot adequately be replaced by any other food.
She is also following standard cancer treatments including oral chemotherapy.
Gold Coast oncologist Steven Stylian said it was difficult to know which treatments were working on Jones but said he would not dismiss the milk treatment.
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"People stumble across cures all the time this way," Stylian said, adding "All treatments need to be evaluated and I'm open minded about it".
Jones has been a lactation consultant at John Flynn for 14 years and said she knew about the milk's benefits.