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Understanding ACC Newly Diagnosed Find A Physician Clinical Trials For Patients Research Landscape Molecular Targets PDX Screening Platform Funded Grants For Researchers What is Adenoid cystic carcinoma ACC. It is a cancer of secretory glands typically originating in the head and neck region but also found in the breast skin and elsewhere. How rare is ACC. It is diagnosed in about 4 of every 1 million people each year and afflicts more than 200000 patients throughout the world.