Question: Tamoxifen (Nolvadex) is prescribed for the client with metastatic breast carcinoma. The nurse administering the medication understands that the primary action of this medication is to:
1. Increase DNA and RNA synthesis.
2. Promote the biosynthesis of nucleic acids.
3. Increase estrogen concentration and estrogen response.
4. Compete with estradiol for binding to estrogen in tissues containing high concentrations of receptors.