Question

Select the correct set of anticancer drugs that belong to “pyrimidine and related compounds”:

• A. 5-Flurouracil, Tegafur, Decitabine, 5-Azacytidine
• B. 5-Flurouracil, Tegafur, Decitabine, Clofarabine
• C. Tegafur, Decitabine, 5-Azacytidine, Pentostatin
• D. Tegafur, Decitabine, 5-Azacytidine, Clofarabine

Answer 1

The Correct Option is A

To determine the correct set of anticancer drugs that belong to "pyrimidine and related compounds," we need to examine the chemical structure and classification of the drugs listed in the options.

The correct answer is the set: 5-Flurouracil, Tegafur, Decitabine, 5-Azacytidine

Let's analyze why this set is the correct choice:

1. 5-Fluorouracil (5-FU): This drug is a well-known pyrimidine analog, primarily used in the treatment of various cancers. It inhibits thymidylate synthase, disrupting DNA synthesis.
2. Tegafur: This is a prodrug of 5-Fluorouracil, retaining the pyrimidine analog structure and thus is relatedly classified with pyrimidines.
3. Decitabine: This is a derivative of cytidine, a pyrimidine nucleoside. It is used in myelodysplastic syndromes and works as a hypomethylating agent.
4. 5-Azacytidine: Similar to Decitabine, this compound is a pyrimidine nucleoside analog. It is used in the treatment of myelodysplastic syndromes and acts as a DNA methyltransferase inhibitor.

Now, let's review and eliminate the incorrect options:

• The option 5-Flurouracil, Tegafur, Decitabine, Clofarabine includes Clofarabine, which is a purine analog, not a pyrimidine. This makes this set incorrect.
• The option Tegafur, Decitabine, 5-Azacytidine, Pentostatin includes Pentostatin, another purine analog, thereby making this set incorrect.
• The option Tegafur, Decitabine, 5-Azacytidine, Clofarabine also wrongly includes Clofarabine, as explained earlier.

In conclusion, only the set 5-Flurouracil, Tegafur, Decitabine, 5-Azacytidine correctly contains drugs that are pyrimidine and related compounds.