angiogenesis factor

n.
  1. A substance of 2000 to 20,000 molecular weight secreted by macrophages and stimulating neovascularization in healing wounds or in the stroma of tumors.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.