Anticancer Drugs Practice Questions

Q: All of the following are used to limit the toxicity of cisplatin except:

N-acetylcysteine. The primary dose-limiting toxicity of **Cisplatin** is **nephrotoxicity** (acute tubular necrosis). This occurs because cisplatin accumulates in the renal proximal tubules, leading to oxidative stress and DNA damage [1]. **1. Why N-acetylcysteine (NAC) is the correct answer:** While NAC is a potent antioxidant and the specific antidote for **Acetaminophen (Paracetamol) toxicity**, it is **not** a standard clinical intervention used to prevent cisplatin-induced nephrotoxicity. Its role in this context remains experimental and is not part of established oncology protocols. **2. Why the other options are incorrect (Standard Preventive Measures):** * **Chloride Diuresis:** This is the most critical preventive step. Administering Cisplatin in **Normal Saline (0.9% NaCl)** maintains a high chloride concentration in the renal tubules [1]. High chloride levels suppress the conversion of cisplatin into its highly reactive (and toxic) aquated form, thereby protecting the kidneys. * **Slow Rate of Infusion:** Rapid bolus doses increase peak plasma concentrations, significantly raising the risk of renal damage. Infusing the drug slowly over several hours reduces the peak concentration reaching the kidneys. * **Amifostine:** This is a cytoprotective adjuvant (a prodrug) that is converted by alkaline phosphatase into a free thiol. It acts as a scavenger for reactive metabolites of cisplatin specifically in normal tissues, reducing nephrotoxicity without compromising antitumor efficacy [1]. **Clinical Pearls for NEET-PG:** * **Cisplatin Triad of Toxicity:** Nephrotoxicity, Ototoxicity (high-frequency hearing loss), and severe Emetogenicity (requires 5-HT3 antagonists + Dexamethasone + Aprepitant) [1]. * **Carboplatin:** A cisplatin analogue with less nephrotoxicity but significant **myelosuppression** (thrombocytopenia). * **Amifostine** is also used to reduce xerostomia (dry mouth) in patients undergoing radiotherapy.

Q: For which of the following cancers can retinoids be used for treatment?

Cutaneous T-cell lymphoma. **Explanation:** Retinoids are natural and synthetic derivatives of Vitamin A that regulate cell growth, differentiation, and apoptosis by binding to specific nuclear receptors (RAR and RXR). **Why Cutaneous T-cell lymphoma (CTCL) is correct:** **Bexarotene**, a third-generation selective retinoid X receptor (RXR) agonist, is specifically FDA-approved for the treatment of refractory Cutaneous T-cell lymphoma (including Mycosis Fungoides). It induces apoptosis and inhibits the cell cycle progression of malignant T-cells. Additionally, **All-trans retinoic acid (ATRA)** is a cornerstone in treating Acute Promyelocytic Leukemia (APML) by inducing the differentiation of leukemic promyelocytes. **Why other options are incorrect:** * **Bladder, Stomach, and Liver Cancers:** While retinoids have been studied for their potential "chemopreventive" properties in various epithelial malignancies, they are not standard-of-care therapeutic agents for these solid tumors. These cancers are primarily managed with surgery, radiation, and conventional cytotoxic chemotherapy (e.g., Gemcitabine/Cisplatin for bladder, Fluorouracil for stomach). **High-Yield Clinical Pearls for NEET-PG:** * **APML (M3):** ATRA is the drug of choice. Watch for **"Differentiation Syndrome"** (fever, respiratory distress), treated with Dexamethasone. * **Acne & Psoriasis:** Isotretinoin (oral) and Tazarotene (topical) are common dermatological uses. * **Adverse Effects:** Hypertriglyceridemia, dry skin/mucosa, and **teratogenicity** (mandatory pregnancy testing is required before prescription). * **Alitretinoin:** Used topically for Kaposi Sarcoma lesions.

Q: The combination of meclorethamine, vincristine, prednisolone, and procarbazine is used for the treatment of patients with which condition?

Hodgkin's disease. **Explanation:** The combination of **Meclorethamine, Oncovin (Vincristine), Procarbazine, and Prednisolone** is known as the **MOPP regimen**. This was the first chemotherapy combination to achieve a high cure rate in advanced **Hodgkin’s disease (HD)**. * **Mechanism:** Each drug in this regimen targets the cell cycle differently to maximize cytotoxicity while minimizing overlapping toxicities. Meclorethamine is an alkylating agent (nitrogen mustard), Vincristine is a microtubule inhibitor, Procarbazine is a unique alkylating agent that also inhibits DNA/RNA synthesis, and Prednisolone provides lympholytic effects. * **Clinical Note:** While MOPP was the gold standard, it has largely been replaced by the **ABVD regimen** (Adriamycin, Bleomycin, Vinblastine, and Dacarbazine) because ABVD is less leukemogenic and does not cause the permanent sterility associated with the MOPP regimen. **Analysis of Incorrect Options:** * **A. Acute Lymphocytic Leukemia (ALL):** The standard induction regimen typically involves Vincristine, Prednisolone, L-Asparaginase, and an Anthracycline (e.g., Daunorubicin). * **B. Chronic Lymphocytic Leukemia (CLL):** Treatment usually involves targeted therapies like Ibrutinib or Fludarabine-based regimens (FCR: Fludarabine, Cyclophosphamide, Rituximab). * **D. Acute Myelocytic Leukemia (AML):** The classic treatment is the **"7+3" regimen**, consisting of Cytarabine (7 days) and an Anthracycline like Daunorubicin (3 days). **High-Yield Clinical Pearls for NEET-PG:** * **MOPP side effect:** High risk of **secondary leukemia** (AML) and **sterility** (azoospermia). * **ABVD side effect:** Pulmonary fibrosis (Bleomycin) and Cardiotoxicity (Adriamycin/Doxorubicin). * **Procarbazine:** Known for causing a **Disulfiram-like reaction** with alcohol and hypertensive crises with tyramine-rich foods (MAO inhibition).

Q: Which of the following antineoplastic drugs should not be administered to a chronic alcoholic patient due to the risk of developing a disulfiram-like reaction?

Procarbazine. **Explanation:** **Procarbazine** is the correct answer because it is a methylhydrazine derivative that possesses unique biochemical properties, including the inhibition of several enzymes. Most notably, it inhibits **aldehyde dehydrogenase (ALDH)**, the enzyme responsible for metabolizing acetaldehyde into acetic acid. When a patient taking procarbazine consumes alcohol, acetaldehyde accumulates in the blood, leading to a **disulfiram-like reaction** characterized by flushing, tachycardia, nausea, vomiting, and hypotension. **Analysis of Options:** * **Procarbazine (Correct):** In addition to ALDH inhibition, it is a weak **Monoamine Oxidase (MAO) inhibitor**. Patients must avoid tyramine-rich foods (cheese, wine) to prevent hypertensive crises. It is primarily used in the MOPP regimen for Hodgkin’s Lymphoma. * **Dacarbazine:** An alkylating agent used in melanoma and Hodgkin’s (ABVD regimen). Its main side effect is severe emesis, but it does not cause disulfiram-like reactions. * **Melphalan:** A nitrogen mustard alkylating agent used primarily in Multiple Myeloma. Its toxicity is mainly hematological (bone marrow suppression). * **Hydroxyurea:** An S-phase specific inhibitor of ribonucleotide reductase used in CML and Sickle Cell Anemia. It does not interfere with alcohol metabolism. **High-Yield Clinical Pearls for NEET-PG:** * **Other drugs causing Disulfiram-like reactions:** Metronidazole (most common), Tinidazole, Cefotetan, Cefoperazone, Chlorpropamide, and Griseofulvin. * **Procarbazine Toxicity:** It is highly leukemogenic and carries a high risk of causing secondary acute leukemia. * **Mnemonic:** Remember **"P"** for Procarbazine, **"P"** for Pro-drug, and **"P"** for Psychosis (as it can cross the BBB and cause CNS effects).

Q: What is the drug of choice for surgically unresectable renal cell carcinoma?

Sunitinib. **Explanation:** **Sunitinib** is the drug of choice for surgically unresectable or metastatic **Renal Cell Carcinoma (RCC)**. The underlying medical concept involves the pathophysiology of RCC, which is a highly vascular tumor often associated with the loss of the VHL (von Hippel-Lindau) gene. This loss leads to an overproduction of **Vascular Endothelial Growth Factor (VEGF)**. Sunitinib is an oral multi-kinase inhibitor that targets VEGF receptors (VEGFR-1, 2, and 3) and Platelet-Derived Growth Factor receptors (PDGFR), effectively inhibiting angiogenesis and tumor cell proliferation. **Analysis of Incorrect Options:** * **Sorafenib (Option A):** While also a multi-kinase inhibitor used in RCC, it is generally considered a second-line agent or used when sunitinib is not tolerated. It is the drug of choice for **Hepatocellular Carcinoma (HCC)**. * **Imatinib (Option B):** This is a selective BCR-ABL tyrosine kinase inhibitor. It is the drug of choice for **Chronic Myeloid Leukemia (CML)** and Gastrointestinal Stromal Tumors (GIST). * **Cetuximab (Option D):** This is a monoclonal antibody against the **Epidermal Growth Factor Receptor (EGFR)**. It is primarily used in the treatment of metastatic colorectal cancer and head and neck squamous cell carcinoma. **High-Yield Clinical Pearls for NEET-PG:** * **Pazopanib** is an alternative first-line agent for RCC with a similar mechanism to Sunitinib but a different side-effect profile. * **Side Effect Highlight:** Sunitinib is notorious for causing **Hand-Foot Syndrome** (palmar-plantar erythrodysesthesia) and potential cardiotoxicity (decreased LVEF). * **Temsirolimus/Everolimus:** These are mTOR inhibitors used specifically in high-risk/poor-prognosis RCC.

Q: Vinca alkaloids act on:

Mitotic spindle. ### Explanation **Mechanism of Action (Why C is correct):** Vinca alkaloids (e.g., Vincristine, Vinblastine, Vinorelbine) are **cell-cycle specific** agents that act primarily during the **M phase** of the cell cycle. Their specific molecular target is **tubulin**. They bind to $\beta$-tubulin and **inhibit its polymerization** into microtubules. This prevents the formation of the **mitotic spindle**, leading to "mitotic arrest" in metaphase and subsequent apoptosis. **Analysis of Incorrect Options:** * **A & B (G and S phases):** Vinca alkaloids do not directly interfere with protein synthesis (G1/G2) or DNA replication (S phase). Antimetabolites like Methotrexate and 5-Fluorouracil are the classic drugs acting on the S phase. * **D (M phase):** While Vinca alkaloids act *during* the M phase, the question asks for the specific structure they act *on*. In pharmacology entrance exams, if both the phase (M phase) and the specific target (Mitotic spindle/Tubulin) are provided, the **molecular target** is the more precise and preferred answer. **High-Yield Clinical Pearls for NEET-PG:** * **Vincristine:** Notable for **Peripheral Neuropathy** (microtubules are essential for axonal transport) and **SIADH**. It is relatively bone marrow sparing. * **Vinblastine:** Notable for **Bone Marrow Suppression** ("Blast" blasts the bone marrow). * **Taxanes (Paclitaxel):** These also act on the mitotic spindle but have the *opposite* mechanism—they **prevent depolymerization** (stabilize microtubules), creating "frozen" spindles. * **Fatal Route:** Vinca alkaloids are **fatal if given intrathecally**; they must only be administered intravenously.

Q: Which of the following statements about Ifosfamide is INCORRECT?

It is less neurotoxic than cyclophosphamide.. ### Explanation **Why Option D is the correct (Incorrect) statement:** Ifosfamide is actually **more neurotoxic** than cyclophosphamide. This is because the metabolism of ifosfamide produces significantly higher levels of **chloroacetaldehyde**, a byproduct that crosses the blood-brain barrier and causes encephalopathy (confusion, seizures, or coma). In contrast, cyclophosphamide produces very little chloroacetaldehyde, making its neurotoxic profile much lower. **Analysis of other options:** * **Option A (Correct):** Ifosfamide is a structural isomer of cyclophosphamide and belongs to the **Nitrogen Mustard** class of alkylating agents. * **Option B (Correct):** It is a prodrug that requires hepatic activation. It is metabolized primarily by **CYP3A4** (and CYP2B6) to form the active alkylating species, **ifosfamide mustard**. * **Option C (Correct):** While ifosfamide mustard is the "active" cytotoxic metabolite for DNA cross-linking, **chloroacetaldehyde** is also a metabolite formed during the dechloroethylation pathway. It is clinically significant as it is responsible for the drug's characteristic neurotoxicity. **High-Yield Clinical Pearls for NEET-PG:** 1. **Hemorrhagic Cystitis:** Both ifosfamide and cyclophosphamide produce **Acrolein**, which causes bladder toxicity. However, the risk is higher with ifosfamide; therefore, **MESNA** (Mercaptoethane sulfonate) and aggressive hydration are mandatory. 2. **Fanconi Syndrome:** Ifosfamide is specifically associated with proximal renal tubular acidosis (Fanconi-like syndrome) due to chloroacetaldehyde-induced damage. 3. **Metabolism:** Unlike cyclophosphamide (primarily CYP2B6), ifosfamide relies heavily on **CYP3A4**, making it more prone to drug-drug interactions.

Q: A 30-year-old male diagnosed with Hodgkin's lymphoma was started on Bleomycin. Which of the following is false regarding Bleomycin?

It has a high risk of causing bone marrow suppression. Bleomycin is a unique glycopeptide antibiotic used in the treatment of Hodgkin’s lymphoma and testicular tumors. Its primary mechanism involves binding to DNA and iron, leading to the formation of free radicals that cause single- and double-strand DNA breaks [1]. **1. Why Option D is correct (The False Statement):** Bleomycin is famously known as a **"bone marrow-sparing"** drug. Unlike most cytotoxic agents, it causes minimal to no myelosuppression. This makes it a vital component of combination regimens like ABVD (Adriamycin, Bleomycin, Vinblastine, Dacarbazine), as it does not add to the hematological toxicity of other drugs. **2. Why other options are incorrect (True Statements):** * **Option A:** Pulmonary fibrosis is the most serious dose-limiting toxicity of Bleomycin [2]. It occurs because the lungs lack the inactivating enzyme (hydrolase), leading to oxidative damage. * **Option B:** Flagellate pigmentation (linear, whip-like hyperpigmented streaks on the trunk) is a pathognomonic cutaneous side effect of Bleomycin [2]. * **Option C:** Bleomycin is inactivated by the enzyme **Bleomycin hydrolase**. This enzyme is found in high concentrations in most tissues but is notably deficient in the **lungs and skin**, explaining why toxicity is localized to these organs. **High-Yield Clinical Pearls for NEET-PG:** * **Cell Cycle Specificity:** Bleomycin acts specifically on the **G2 phase** [1]. * **Monitoring:** Pulmonary Function Tests (PFTs), specifically **DLCO** (Diffusion Capacity of Carbon Monoxide), are used to monitor early lung toxicity. * **Maximum Cumulative Dose:** To prevent irreversible fibrosis, the lifetime dose is usually capped at **400 units**.

Question 1

All of the following are used to limit the toxicity of cisplatin except:

Accepted Answer

N-acetylcysteine

Answer

Slow rate of infusion

Answer

Chloride diuresis

Answer

Amifostine

Question 2

For which of the following cancers can retinoids be used for treatment?

Accepted Answer

Cutaneous T-cell lymphoma

Answer

Bladder

Answer

Stomach

Answer

Liver

Question 3

Methotrexate resistance is due to?

Accepted Answer

Increased concentrations of intracellular dihydrofolate reductase (DHFR) through gene amplification

Answer

Failure of efflux pumps

Answer

Bacterial modification

Answer

Increased synthesis of polyglutamates

Question 4

Bevacizumab is used in which of the following carcinomas?

Accepted Answer

Renal carcinoma

Answer

Breast carcinoma

Answer

Hepatic carcinoma

Answer

Lung carcinoma

Question 5

The combination of meclorethamine, vincristine, prednisolone, and procarbazine is used for the treatment of patients with which condition?

Accepted Answer

Hodgkin's disease

Answer

Acute lymphocytic leukemia

Answer

Chronic lymphocytic leukemia

Answer

Acute myelocytic leukemia

Question 6

Which of the following antineoplastic drugs should not be administered to a chronic alcoholic patient due to the risk of developing a disulfiram-like reaction?

Accepted Answer

Procarbazine

Answer

Dacarbazine

Answer

Melphalan

Answer

Hydroxyurea

Question 7

What is the drug of choice for surgically unresectable renal cell carcinoma?

Accepted Answer

Sunitinib

Answer

Sorafenib

Answer

Imatinib

Answer

Cetuximab

Question 8

Vinca alkaloids act on:

Accepted Answer

Mitotic spindle

Answer

G phase

Answer

S phase

Answer

M phase

Question 9

Which of the following statements about Ifosfamide is INCORRECT?

Accepted Answer

It is less neurotoxic than cyclophosphamide.

Answer

It is a nitrogen mustard.

Answer

It is metabolized by CYP3A4 to form an active metabolite.

Answer

Chloracetaldehyde is an active metabolite.

Question 10

A 30-year-old male diagnosed with Hodgkin's lymphoma was started on Bleomycin. Which of the following is false regarding Bleomycin?

Accepted Answer

It has a high risk of causing bone marrow suppression

Answer

It can cause pulmonary fibrosis

Answer

It can cause flagellate pigmentation of skin

Answer

It is metabolized by hydrolase enzyme

Anticancer Drugs — MCQs

Anticancer Drugs — MCQs

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