tissues
We examined       the PTHrP mRNA expression in breast cancer tissues by coamplification polymerase        chain reaction (PCR) in mole ratio to internal standard beta-actin mRNA.
We examined       the  @OBJECT$  mRNA expression  @PREDICAT$  breast cancer  @SUBJECT$  by coamplification polymerase        chain reaction (PCR) in mole ratio to internal standard beta-actin mRNA.