Former President Joseph R. Biden Jr. was diagnosed Friday with an aggressive form of prostate cancer, a spokesman said on Sunday.

The diagnosis came after doctors found a “small nodule” on Mr. Biden’s prostate that required “further evaluation.”

“While this represents a more aggressive form of the disease, the cancer appears to be hormone-sensitive which allows for effective management,” the spokesman said in a statement. “The president and his family are reviewing treatment options with his physicians.”

This is a developing story. Check back for updates.