NEW YORK (AP) — Author-journalist Joe McGinniss says he was diagnosed in May with advanced prostate cancer but is responding well to treatment and feels ‘‘terrific.’’

The 70-year-old McGinniss is best known for controversial works such as ‘‘The Selling of the President’’ and ‘‘Fatal Vision.’’ On Wednesday, he posted on his Facebook page that he had ‘‘inoperable, terminal, metastatic prostate cancer.’’ He confirmed the diagnosis in response to an email from The Associated Press and in a subsequent Facebook posting.