NCIt definition : An indication that progesterone receptor (PRG; PR) expression has not been detected
in a sample.;
Alternative definition : NCI-GLOSS: Describes cells that do not have a protein to which the hormone progesterone
will bind. Cancer cells that are progesterone receptor negative do not need progesterone
to grow, and usually do not stop growing when treated with hormones that block progesterone
from binding.;
Codes from synonyms : CDR0000045275; CDR0000044449;