Dr. William Newman, 57 professor of pathology at the George Washington University medical school and director of the anatomic pathology division of the University Medical Center, died Sunday at Suburban Hospital in Bethesda after a heart attack.

He was an authority on lobular carcinoma, a type of breast cancer. In addition to his posts with George Washington University, he was a consultant to the National Institutes of Health and Veterans Administration hosptals in Washington and Martinsburg, W.Va.

Dr. Newman came to Washington and joined the university in 1953 as an assistant professor of pathology at the medicial school and as assistant director of laboratories at George Washington University Hospital. He also was a surgical pathologist on the hospital staff.

He was named professor of pathology in 1964 and director of the anatomic pathology division in 1972.

Dr. Newman was born in New York City. He earned a bachelor's degree at the University of Wisconsin. He was a 1946 graduate of the New York University College of Medicine and served his internship at Bellevue Hospital in the New York.

He served as chief pathology resident in the Kingsbridge Veterans Administration Hospital in New York and held a National Cancer Instituted fellowship before coming to Washinton he served with the Arm Medical Crops in Japan from 1948 to 1950.

Dr. Newman was member of the District of Columbia Medical Society, the Washington Society of Pathologists, and the American Assoication of Pathologists and Bacteriologists.

He is survived by his wife, Sylvia, and a son, Neil G., both of the home in North Chevy Chase; another son, Dr. Robert R., of Gainesville, Fla., a daughter, Paula Beth Miner, of Orleans, Mass., his mother, Martha Newman of the New York City, and a sister, Roanne Hickok, of Winston-Salem, N.C.

The family suggests that expressions of sympathy be in the form of contributios to the Dr. William Newman Memorial Fund, Department of Pathology, George Washington University Medical Center, Washington, D.C. 20037.