Xana Antunes, a business journalist who was editor of The New York Post from 1999 to 2001 and later ran the business news site Quartz, died on Jan. 27 at a hospice care center in Manhattan. She was 55.

The cause was pancreatic cancer, her husband, Scott Schell, said.

Ms. Antunes worked for some of the best-known business news outlets over a three-decade career. When she was appointed editor of The Post, she joined a handful of women who were leading major newsrooms at the time.

“As I looked around the paper then, almost all the other senior staff were men,” she said in a recent speech.

At The Post, under the ownership of Rupert Murdoch, Ms. Antunes bolstered the paper’s business coverage and introduced new lifestyle features, including a page devoted to the fashion industry.