gametoid theory

[gămĭ-toid′]
n.
  1. The theory that the malignancy of a tumor results from neoplastic cells having developed the characteristics of gametes, so that they multiply and grow autonomously as parasites on the host's tissues.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.