Anticancer Drugs Practice Questions

Q: Which of the following is an aromatase inhibitor?

Letrozole. ***Letrozole*** - **Letrozole** is a commonly used **aromatase inhibitor**, which works by blocking the enzyme **aromatase** that converts androgens into estrogens [1]. - This reduction in estrogen levels is crucial in treating **hormone-sensitive breast cancers** [1]. *Tamoxifen* - **Tamoxifen** is a **selective estrogen receptor modulator (SERM)**, not an aromatase inhibitor [2]. - It acts by blocking estrogen receptors in breast tissue while potentially stimulating them in other tissues like bone and uterus [2]. *Danazol* - **Danazol** is a synthetic androgen that suppresses the hypothalamic-pituitary-gonadal axis, leading to **decreased estrogen production**. - It works by inhibiting gonadotropin release and directly inhibiting ovarian steroidogenesis, rather than blocking the aromatase enzyme directly. *Taxane* - **Taxanes** are a class of **chemotherapy drugs** that interfere with cell division by stabilizing microtubules. - They are used to treat various cancers, including breast cancer, but do not act as aromatase inhibitors.

Q: Which anticancer drug is known to inhibit spindle formation during cell division?

Vinca alkaloids. ***Vinca alkaloids*** - **Vinca alkaloids**, such as **vincristine** and **vinblastine**, bind to **tubulin** and prevent its polymerization into microtubules. - This action effectively **inhibits the formation of the mitotic spindle**, leading to metaphase arrest and ultimately cell death. *Busulfan* - **Busulfan** is an **alkylating agent** that **cross-links DNA**, thereby interfering with DNA replication and transcription. - Its primary mechanism is **DNA damage**, not direct inhibition of spindle formation. *5-FU* - **5-fluorouracil (5-FU)** is an **antimetabolite** that inhibits **thymidylate synthase**, thereby impairing DNA synthesis and repair. - It acts by **mimicking pyrimidine bases** and incorporating into DNA and RNA, leading to cellular dysfunction. *Methotrexate* - **Methotrexate** is an **antifolate** drug that inhibits **dihydrofolate reductase**, an enzyme crucial for the synthesis of purines and pyrimidines. - This enzyme inhibition leads to **impaired DNA and RNA synthesis**, impacting rapidly dividing cells.

Q: Which drug is primarily used in the treatment of breast cancer?

Tamoxifen. ***Tamoxifen*** - **Tamoxifen** is a **selective estrogen receptor modulator (SERM)** primarily used to treat and prevent **estrogen receptor (ER)-positive breast cancer**. - It works by blocking estrogen from binding to receptors in breast cancer cells, thereby inhibiting their growth. *Cyproterone* - **Cyproterone** is an **anti-androgen** and **progestogen** primarily used to treat conditions like **prostate cancer**, **acne**, and **hirsutism** in women. - Its main mechanism involves blocking androgen receptors and reducing androgen production, which is not the primary pathway for breast cancer. *Testosterone* - **Testosterone** is an **androgen** (male sex hormone) and is **not used** in the primary treatment of breast cancer. - In certain rare cases of severe metastatic breast cancer, androgens like high-dose testosterone have been historically used for palliation, but this is not standard therapy. *Chlorambucil* - **Chlorambucil** is an **alkylating agent** used primarily in the treatment of **chronic lymphocytic leukemia (CLL)** and certain **lymphomas**. - It works by interfering with DNA replication and transcription, but it is not a first-line or primary agent for breast cancer.

Q: What is the primary indication for the use of Erlotinib?

NSCLC. ***NSCLC (Non-Small Cell Lung Cancer)*** - **Erlotinib** is primarily indicated for patients with advanced **non-small cell lung cancer (NSCLC)**, particularly those with activating mutations in the **epidermal growth factor receptor (EGFR)**. - It functions as an **EGFR tyrosine kinase inhibitor**, blocking the signaling pathways essential for cancer cell growth and survival. - This is the **FDA-approved primary indication** and where Erlotinib shows the most significant clinical benefit. *Pancreatic cancer* - While Erlotinib has been used in combination with gemcitabine for **locally advanced, unresectable or metastatic pancreatic cancer**, it is not its primary or most prominent indication. - Its efficacy in pancreatic cancer is generally modest and overshadowed by its dramatic impact in EGFR-mutated NSCLC. *Colon cancer* - **Erlotinib** is **not a primary treatment** for **colon cancer**. - Other targeted therapies (such as anti-EGFR monoclonal antibodies like cetuximab) or chemotherapy regimens are typically used for colorectal cancer. *Gall bladder cancer* - **Erlotinib** is generally **not indicated** for the treatment of **gallbladder cancer**. - Treatment often involves surgery, chemotherapy, or radiation, with targeted therapies being less established for this malignancy.

Q: Which of the following statements is FALSE regarding vincristine?

It does not cause alopecia.. ***It does not cause alopecia.*** - This statement is **false** because vincristine, like many chemotherapeutic agents, commonly causes **alopecia** (hair loss) due to its impact on rapidly dividing cells, including hair follicle cells. - While it may be considered less myelosuppressive than some other anticancer drugs, its effect on hair follicles is well-documented. *It is an alkaloid.* - This statement is **true** because vincristine is a **vinca alkaloid**, derived from the Madagascar periwinkle plant (*Catharanthus roseus*). - Vinca alkaloids are a class of antineoplastic agents that target microtubules. *Its use is associated with neurotoxicity.* - This statement is **true** as **neurotoxicity** is a prominent and dose-limiting side effect of vincristine, manifesting as peripheral neuropathy (e.g., paresthesias, foot drop, constipation due to autonomic neuropathy). - This adverse effect arises from its mechanism of action, which involves disrupting microtubules critical for axonal transport. *It is a useful drug for induction of remission in acute lymphoblastic leukemia.* - This statement is **true**; **vincristine** is a cornerstone of combination chemotherapy regimens for **acute lymphoblastic leukemia (ALL)**, particularly during the induction phase. - Its efficacy in ALL is attributed to its ability to arrest cell division in metaphase.

Q: Mode of excretion of cyclophosphamide is?

Kidney. ***Kidney*** - Cyclophosphamide is a **prodrug** that undergoes metabolism in the liver to its active forms. However, both the parent drug and its active metabolites are primarily **excreted renally**. [1] - Renal excretion means that patients with **renal impairment** may require dose adjustments to prevent drug accumulation and increased toxicity. [3] *Lung* - The lungs are primarily involved in **gas exchange** and the elimination of volatile substances, not non-volatile drugs like cyclophosphamide. - While some drugs can be excreted to a minor extent via the lungs, it is not the primary route for **cyclophosphamide**. *Liver* - The liver is the primary site of **metabolism** for cyclophosphamide, where it is converted into active cytotoxic metabolites. [1], [2] - While metabolites are formed here, the liver is not the main organ for the final **elimination** (excretion) of the drug or its metabolites from the body. *Skin* - The skin's role in drug excretion is generally minimal, mainly involving substances excreted in **sweat**, and is not a significant route for cyclophosphamide. - Excretion via the skin is typically very limited for most drugs and does not play a major role in the elimination of **chemotherapeutic agents** like cyclophosphamide.

Q: Which of the following medications is known to cause peripheral neuropathy?

Vincristine. ***Vincristine*** - **Vincristine** is a **vinca alkaloid chemotherapeutic agent** that is **notorious** for causing **peripheral neuropathy** as its **dose-limiting toxicity**. - It interferes with **microtubule function** during mitosis, leading to **axonal damage** and predominantly **sensorimotor neuropathy**. - Peripheral neuropathy occurs in **virtually all patients** receiving vincristine and typically manifests as **distal paresthesias**, **loss of deep tendon reflexes**, and **motor weakness**. - This is the **most characteristic adverse effect** of vincristine. *Paclitaxel* - **Paclitaxel** is a **taxane chemotherapeutic agent** that also causes **peripheral neuropathy** as a significant adverse effect. - It stabilizes **microtubules**, preventing their depolymerization, leading to neurotoxicity. - While peripheral neuropathy is common with paclitaxel, it shares prominence with other major toxicities like **myelosuppression** and **hypersensitivity reactions**. *Sulfonamide* - **Sulfonamide antibiotics** are primarily associated with **hypersensitivity reactions**, **crystalluria**, **skin rashes**, and **hematologic abnormalities**. - Peripheral neuropathy is not a recognized or common adverse effect of sulfonamides. *Amiodarone* - **Amiodarone** is an **antiarrhythmic drug** with multiple adverse effects including **pulmonary fibrosis**, **thyroid dysfunction**, **corneal deposits**, and **hepatotoxicity**. - While rare cases of **peripheral neuropathy** have been reported, it is **not a characteristic or common adverse effect** of amiodarone.

Q: Which of the following drugs is not typically used for carcinoma of the head and neck?

Busulfan. ***Busulfan*** - **Busulfan** is an **alkylating agent** primarily used in the treatment of **chronic myeloid leukemia (CML)** and as a conditioning regimen before **stem cell transplantation**. - It is **not a standard chemotherapy agent** for head and neck squamous cell carcinoma. *5FU* - **5-fluorouracil (5FU)** is a **pyrimidine analog antimetabolite** commonly used in the treatment of head and neck cancers. - It works by interfering with **DNA and RNA synthesis**, making it an effective agent in combination with other drugs or radiation. *Cisplatin* - **Cisplatin** is a **platinum-based chemotherapy drug** that is a cornerstone in the treatment of head and neck squamous cell carcinoma. - It forms **DNA adducts**, leading to cell death, and is often used in combination with radiation or other chemotherapy agents. *Methotrexate* - **Methotrexate** is an **antimetabolite** that inhibits **dihydrofolate reductase**, thereby interfering with DNA synthesis. - It is frequently used in the treatment of head and neck cancers, particularly in the **recurrent or metastatic setting**.

Q: Peripheral neuropathy as a side effect is caused by which of the following anticancer drugs?

Vincristine. ***Vincristine*** - **Vincristine** is a **vinca alkaloid** that works by inhibiting **microtubule formation**, which is essential for cell division [1], [3]. - Its major dose-limiting toxicity is **peripheral neuropathy**, manifesting as paresthesias, weakness, and loss of reflexes due to damage to neuronal microtubules [1], [2]. *Cyclophosphamide* - **Cyclophosphamide** is an **alkylating agent** that forms cross-links in DNA, leading to cell death. - Its most common side effects include **myelosuppression**, hemorrhagic cystitis, and alopecia; **peripheral neuropathy** is generally not a prominent adverse effect. *Etoposide* - **Etoposide** is a **topoisomerase II inhibitor** that causes DNA strand breaks. - Key toxicities include **myelosuppression** and **gastrointestinal disturbances**, but it is not typically associated with significant peripheral neuropathy. *Irinotecan* - **Irinotecan** is a **topoisomerase I inhibitor** that causes DNA damage during replication. - Its primary dose-limiting toxicities are **diarrhea** and **myelosuppression**, not peripheral neuropathy.

Q: Which of the following substances is known to cause predominantly sensory neuropathy?

Cisplatin. ***Cisplatin*** - **Cisplatin** is a platinum-based chemotherapy drug well-known for causing **dose-dependent peripheral neuropathy**, primarily affecting sensory neurons. - Patients often present with **numbness**, **tingling**, and **loss of proprioception** in a glove-and-stocking distribution. - This is the **most characteristic** drug for **predominantly sensory neuropathy** among chemotherapeutic agents. *Pyridoxine excess* - While **pyridoxine (vitamin B6) excess** can cause sensory neuropathy, it is less commonly observed as a primary cause compared to cisplatin in the context of drug-induced neuropathies. - High doses of pyridoxine can lead to **dorsal root ganglionopathy**, affecting sensory nerve fibers. *Suramin* - **Suramin** is an anthelmintic agent primarily used for treating sleeping sickness, and it is known to cause a variety of side effects, including **renal toxicity** and **neurological symptoms**. - While neurological side effects can occur, they are not typically characterized as a **predominantly sensory neuropathy** in the same way as cisplatin. *Vincristine* - **Vincristine** is a vinca alkaloid chemotherapy agent that causes peripheral neuropathy. - However, vincristine typically causes **mixed motor and sensory neuropathy** with prominent motor involvement (foot drop, wrist drop). - This differs from cisplatin's **predominantly sensory** presentation.

Question 1

Which of the following is an aromatase inhibitor?

Accepted Answer

Letrozole

Answer

Tamoxifen

Answer

Danazol

Answer

Taxane

Question 2

Which anticancer drug is known to inhibit spindle formation during cell division?

Accepted Answer

Vinca alkaloids

Answer

Busulfan

Answer

5-FU

Answer

Methotrexate

Question 3

Which drug is primarily used in the treatment of breast cancer?

Accepted Answer

Tamoxifen

Answer

Cyproterone

Answer

Testosterone

Answer

Chlorambucil

Question 4

What is the primary indication for the use of Erlotinib?

Accepted Answer

NSCLC

Answer

Colon cancer

Answer

Gall bladder cancer

Answer

Pancreatic cancer

Question 5

Which of the following statements is FALSE regarding vincristine?

Accepted Answer

It does not cause alopecia.

Answer

Its use is associated with neurotoxicity.

Answer

It is an alkaloid.

Answer

It is a useful drug for induction of remission in acute lymphoblastic leukemia.

Question 6

Mode of excretion of cyclophosphamide is?

Accepted Answer

Kidney

Answer

Lung

Answer

Liver

Answer

Skin

Question 7

Which of the following medications is known to cause peripheral neuropathy?

Accepted Answer

Vincristine

Answer

Sulfonamide

Answer

Amiodarone

Answer

Paclitaxel

Question 8

Which of the following drugs is not typically used for carcinoma of the head and neck?

Accepted Answer

Busulfan

Answer

Cisplatin

Answer

Methotrexate

Answer

5FU

Question 9

Peripheral neuropathy as a side effect is caused by which of the following anticancer drugs?

Accepted Answer

Vincristine

Answer

Cyclophosphamide

Answer

Etoposide

Answer

Irinotecan

Question 10

Which of the following substances is known to cause predominantly sensory neuropathy?

Accepted Answer

Cisplatin

Answer

Pyridoxine excess

Answer

Suramin

Answer

Vincristine

Anticancer Drugs — MCQs

Anticancer Drugs — MCQs

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