Tamoxifen is prescribed for the client with metastatic breast carcinoma. The nurse understands that which is the primary action of this medication? 1. Increase DNA and RNA synthesis. 2. Promote the...

Tamoxifen is prescribed for the client with metastatic breast carcinoma. The nurse understands that which is the primary action of this medication?

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