Following a referral from a GP to a breast cancer clinic, the patient would have a clinical examination followed by an ultrasound scan, or even a mammogram. A biopsy would then be required to diagnose cancer.
Treatment is usually surgery in the first instance, which depending on the size of the tumour could be a mastectomy (which is where the whole breast including the nipple is removed) or a lumpectomy where only part of the breast needs to be removed. Surgery to the lymph glands in the armpit is usually performed at the same time. Surgery can be followed by chemotherapy, radiotherapy, or hormone therapy.
Find out more about the diagnosis and treatment of breast cancer in men on the NHS website.