A 38-year-old Sydney woman has been diagnosed with an aggressive form of breast cancer after soreness she initially associated with her menstrual cycle led to an ultrasound and the discovery of a 2cm tumour. Rosie Agius, a hairdresser, said the pain was the only symptom she noticed before doctors diagnosed triple-negative breast cancer. The case has renewed attention on unusual breast symptoms.

Agius said she first dismissed the discomfort because it arrived around the time of her period. Her partner noticed her holding her breast and encouraged her to seek medical advice. She then booked an ultrasound.

The Diagnosis Followed One Unusual Symptom

Agius told the newspaper she had no other symptoms. She said the tumour was positioned against a muscle, meaning she might not otherwise have felt it.

She said she had little family history of the disease, apart from an aunt. The report said she had completed two rounds of chemotherapy by publication and expected about a year of treatment and surgery.

Triple-negative breast cancer is defined by the absence of three receptors commonly found in breast cancer cells: oestrogen, progesterone and HER2. Because the cancer lacks these receptors, conventional hormone-blocking and HER2-targeted treatments are not effective.

However, chemotherapy remains a central treatment, while immunotherapy and certain targeted drugs, including olaparib for eligible patients with BRCA1 or BRCA2 mutations, may also be options depending on the stage and individual circumstances.

Triple-negative breast cancer is generally associated with faster tumour growth and a higher risk of recurrence than some other breast cancer subtypes. However, outcomes vary considerably, and many patients diagnosed with early-stage disease respond well to treatment.

She received a call from her doctor three days after the ultrasound informing her of the cancer diagnosis. Her clients subsequently helped her arrange a biopsy.

The cancer was reported as stage one to stage two and grade three, with a tumour measuring approximately 2cm. Stage describes the extent of cancer, while grade indicates how abnormal the cancer cells appear under a microscope and how they may behave.

What Triple-Negative Breast Cancer Means

Triple-negative disease has fewer targeted treatment options. Breast Cancer Trials says standard treatment commonly involves chemotherapy and surgery, with radiotherapy often included. Decisions depend on the stage and individual circumstances, rather than the subtype alone. Treatment plans are tailored to each patient and may change as doctors assess the response.

Agius said she had moments when she cried but tried to keep going. She also raised concerns about cancer-care costs, saying she had savings for her own appointments but had seen another patient rescheduled because she could not afford one.

Her experience has prompted a warning to other women not to dismiss changes simply because they coincide with menstruation. She said she wanted to encourage women to get checked.

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When Breast Changes Should Be Checked

Cancer Australia lists unusual breast or nipple pain that does not go away among changes that warrant medical discussion. Other signs include a new lump or swelling, changes in breast size or shape, nipple discharge, skin dimpling or redness, and swelling around the armpit or collarbone. These symptoms can have causes other than cancer, but should be assessed by a doctor.

The agency advises women to know what is normal for their breasts and report new or unusual changes promptly. Most breast changes are not cancer. For Agius, the soreness she initially associated with her menstrual cycle prompted further tests that led to her diagnosis.

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