Invasive papillary carcinoma makes up approximately 3% of all breast cancer diagnoses. It occurs most frequently in postmenopausal women and disproportionately in non-white women. More than 75% of the cases include a ductal carcinoma in situ (DCIS) component.
The main difference between papillary and other breast cancers is the appearance of the cells when you look at them under a microscope. The cells stick out in little papules, or fingerlike projections. In a third of papillary carcinoma cases, the cancer spreads to the lymph nodes. Overall, it has a better prognosis than other, more common breast cancers.