Neoplasia — MCQs

Neoplasia Indian Medical PG Practice Questions and MCQs

Question 601: Aflatoxin B is associated with which malignancy?

A. Liver (Correct Answer)
B. Lung
C. Kidney
D. Stomach

Explanation: **Aflatoxin B1** is a potent hepatocarcinogen produced by the fungi *Aspergillus flavus* and *Aspergillus parasiticus* [2]. These fungi typically contaminate stored crops like peanuts, maize, and rice in humid tropical regions [2]. **Why Liver is Correct:** Aflatoxin B1 is metabolized in the liver by the cytochrome P450 system into a highly reactive intermediate called **Aflatoxin B1-exo-8,9-epoxide**. This metabolite binds covalently to DNA, causing a specific **transversion mutation (G:C to T:A)** in **codon 249 of the TP53 tumor suppressor gene** [1]. This molecular "signature" leads to the development of **Hepatocellular Carcinoma (HCC)** [1]. The risk is significantly synergistic in patients with chronic Hepatitis B (HBV) infection [2], [3]. **Why Other Options are Incorrect:** * **Lung:** Primary risk factors include tobacco smoke (Polycyclic aromatic hydrocarbons), asbestos, and radon [1]. * **Kidney:** Associated with smoking, obesity, hypertension, and specific toxins like cadmium or aristolochic acid. * **Stomach:** Primarily linked to *H. pylori* infection, dietary nitrosamines (smoked foods), and high salt intake. **High-Yield NEET-PG Pearls:** * **Most Potent Carcinogen:** Aflatoxin B1 is considered the most potent naturally occurring chemical carcinogen. * **Synergy:** The risk of HCC increases up to 60-fold when both Aflatoxin exposure and chronic HBV are present [2]. * **Molecular Marker:** Look for "TP53 mutation at codon 249" in clinical vignettes describing HCC in African or Southeast Asian populations [1]. * **Other Aspergillus toxins:** Ochratoxin (produced by *Aspergillus* and *Penicillium*) is associated with Balkan Endemic Nephropathy and transitional cell carcinoma of the urinary tract. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 331-332. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Liver and Gallbladder, pp. 876-877. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 215-216.

Question 602: HMB 45 is a tumor marker for which of the following?

A. Neuroblastoma
B. Neurofibroma
C. Malignant melanoma (Correct Answer)
D. Angiosarcoma

Explanation: **Explanation:** **Malignant Melanoma (Correct Answer):** HMB-45 (Human Melanoma Black-45) is a highly specific monoclonal antibody used in immunohistochemistry (IHC) to identify melanocytic tumors [1]. It reacts against **gp100**, a cytotoxic T-cell-recognized antigen found in **pre-melanosomes**. It is particularly useful in distinguishing amelanotic melanoma from other poorly differentiated tumors. While highly specific, it is less sensitive than S-100 or SOX10, as it may be negative in desmoplastic melanomas. **Incorrect Options:** * **Neuroblastoma:** This is a small round blue cell tumor of childhood [2]. Key markers include **NSE (Neuron Specific Enolase)**, Chromogranin, Synaptophysin, and urinary VMA/HVA levels. * **Neurofibroma:** These are benign nerve sheath tumors. The primary marker is **S-100** (though less intense than in Schwannomas). They do not contain premelanosomes and are HMB-45 negative. * **Angiosarcoma:** This is a malignant vascular tumor. It expresses endothelial markers such as **CD31** (most specific), CD34, and Von Willebrand Factor (Factor VIII-related antigen). **High-Yield Clinical Pearls for NEET-PG:** * **Melanoma Marker Trio:** S-100 (Most sensitive), HMB-45 (Highly specific), and **SOX10** (Excellent for both primary and metastatic melanoma) [1]. * **Melan-A (MART-1):** Another specific marker for melanocytic differentiation often tested alongside HMB-45. * **Vimentin:** Almost all melanomas are Vimentin positive (mesenchymal origin), but it is non-specific. * **Rule Out:** In a **References:** [1] Author A. "Self-citation in scientific papers on Alzheimer's disease." [2] A chatbot. "This is a sample document for testing purpouse."

Question 603: Which of the following viral families is known to be causally associated with tumor formation in healthy-appearing human adults?

A. Flaviviruses
B. Papovaviruses (Correct Answer)
C. Paramyxoviruses
D. Polyoma viruses

Explanation: **Explanation:** The correct answer is **Papovaviruses**. This family name is an acronym derived from three groups: **Pa**pillomavirus, **Po**lyomavirus, and **Va**cuolating agent. **1. Why Papovaviruses is correct:** The **Human Papillomavirus (HPV)**, a member of this family, is the most significant oncogenic virus in humans [2]. High-risk strains (HPV 16 and 18) are causally linked to cervical, anogenital, and oropharyngeal carcinomas [4]. The mechanism involves the viral oncoproteins **E6 and E7**, which inhibit the host’s tumor suppressor proteins **p53 and Rb**, respectively [2]. These infections often persist subclinically in "healthy-appearing" adults for years before progressing to malignancy [1]. **2. Analysis of Incorrect Options:** * **Flaviviruses (Option A):** While Hepatitis C Virus (HCV) is a Flavivirus associated with Hepatocellular Carcinoma [4], the family as a whole is primarily known for acute infections like Dengue and Yellow Fever. * **Paramyxoviruses (Option C):** This family includes Measles, Mumps, and RSV. These viruses cause acute respiratory or systemic infections and are **not** associated with oncogenesis. * **Polyoma viruses (Option D):** While Polyomaviruses (like JC and BK virus) are part of the broader Papovavirus group in older classifications, "Papovaviruses" is the more traditional and inclusive answer choice in standard pathology examinations (like Robbins) when referring to this classic oncogenic group. **High-Yield Clinical Pearls for NEET-PG:** * **HPV 6, 11:** Low risk; cause Genital Warts (Condyloma acuminatum) [3]. * **HPV 16, 18:** High risk; cause Squamous Cell Carcinoma [4]. * **E6** acts on **p53** (degradation via ubiquitin ligase) [5]. * **E7** acts on **Rb** (displaces E2F transcription factor) [2]. * **HTLV-1** (Retrovirus) is the only RNA virus directly linked to human cancer (Adult T-cell Leukemia/Lymphoma) [4]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 261-262. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 334-335. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Female Genital Tract Disease, pp. 466-467. [4] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 219-220. [5] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Female Genital Tract, pp. 1007-1008.

Question 604: Serum alpha-fetoprotein concentration is elevated in which of the following conditions?

A. Hepatoma
B. Cirrhosis
C. Endodermal sinus tumor
D. All of the above (Correct Answer)

Explanation: Alpha-fetoprotein (AFP) is a glycoprotein normally synthesized by the fetal liver and yolk sac. In adults, it serves as a crucial tumor marker, but its elevation is not exclusively limited to malignancies. 1. **Hepatoma (Hepatocellular Carcinoma - HCC):** This is the most classic association. AFP is elevated in approximately 70-80% of patients with HCC [1]. It is used for screening high-risk patients and monitoring recurrence. 2. **Cirrhosis:** AFP can be mildly to moderately elevated in non-neoplastic chronic liver diseases, including cirrhosis and acute/chronic hepatitis. This occurs due to **hepatocyte regeneration** following liver injury. Distinguishing between cirrhosis and HCC often requires observing the trend of AFP levels or using a higher diagnostic cutoff (e.g., >400-500 ng/mL). 3. **Endodermal Sinus Tumor (Yolk Sac Tumor):** Since AFP is physiologically produced by the fetal yolk sac, tumors recapitulating this structure (Yolk Sac Tumors of the ovary or testis) secrete very high levels of AFP. It is a highly specific marker for this histological subtype. **Conclusion:** Since AFP is elevated in primary liver cancer, benign regenerative liver processes, and specific germ cell tumors, **"All of the above"** is the correct choice. **NEET-PG High-Yield Pearls:** * **Triple Marker Test (Pregnancy):** Low AFP levels in maternal serum are associated with **Down Syndrome**, while high levels suggest **Neural Tube Defects** (e.g., Anencephaly, Spina Bifida) or abdominal wall defects (Omphalocele). * **Germ Cell Tumors:** AFP is elevated in Yolk Sac Tumors but **never** in pure Seminomas/Dysgerminomas [2]. * **Other Associations:** Ataxia-telangiectasia and certain GI cancers (gastric, pancreatic) may also show elevated AFP. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Liver And Biliary System Disease, pp. 399-400. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lower Urinary Tract and Male Genital System, pp. 980-982.

Question 605: Which of the following agents can cause oral cancers?

A. Syphilitic glossitis
B. Epstein-Barr virus (EBV)
C. Human papillomavirus (HPV)
D. All of the above (Correct Answer)

Explanation: **Explanation:** Oral squamous cell carcinoma (OSCC) is a multifactorial malignancy. While tobacco and alcohol are the primary risk factors, chronic irritation and specific infectious agents play a significant role in its pathogenesis. * **Syphilitic Glossitis (Option A):** Tertiary syphilis can cause chronic inflammation of the tongue (atrophic glossitis). Historically, this "luetic glossitis" was a well-recognized precursor to dorsal tongue cancer due to chronic tissue remodeling and epithelial dysplasia. * **Epstein-Barr Virus (Option B):** EBV is strongly associated with **Nasopharyngeal Carcinoma** [3] and **Oral Hairy Leukoplakia** (especially in HIV patients) [4]. While less common than HPV in the oral cavity proper, EBV DNA has been identified in various oral squamous cell biopsies, contributing to oncogenesis through the expression of LMP-1 (Latent Membrane Protein). * **Human Papillomavirus (Option C):** High-risk strains, particularly **HPV-16 and 18**, are major causative agents for oropharyngeal cancers (tonsils, base of tongue) [1]. HPV-related cancers are distinct from tobacco-related ones, often occurring in younger patients and showing better prognosis/radiosensitivity [2]. **Conclusion:** Since all three agents are documented risk factors for malignancies in the oral and oropharyngeal regions, **Option D** is the correct answer. **High-Yield Clinical Pearls for NEET-PG:** * **Field Cancerization:** The concept that the entire exposure area (oral mucosa) is at risk of multiple primary tumors due to chronic carcinogen exposure. * **P16 Protein:** Used as a surrogate immunohistochemical marker for HPV-positive oropharyngeal squamous cell carcinoma. * **Most common site:** The ventrolateral border of the tongue and the floor of the mouth are the most common sites for OSCC. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, pp. 739-741. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 334-335. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 219-220. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, pp. 737-738.

Question 606: Pericyte formation occurs in which of the following?

A. Kaposi's sarcoma
B. Glomus tumor
C. Hemangiopericytoma
D. Myopericytoma (Correct Answer)

Explanation: **Explanation:** **1. Why Myopericytoma is the correct answer:** Myopericytoma is a benign mesenchymal tumor characterized by a distinctive **concentric, perivascular arrangement of spindle cells**. These cells show a transition between **pericytes** and smooth muscle cells (myoid differentiation). The hallmark histological feature is the "onion-skin" growth pattern of these myopericytes around thin-walled blood vessels. **2. Analysis of Incorrect Options:** * **Hemangiopericytoma (Option C):** While the name suggests pericytes, this is now considered a historical term [1]. Most tumors previously classified here are now recognized as **Solitary Fibrous Tumors (SFT)**, characterized by "staghorn" or "antler-like" vasculature and *NAB2-STAT6* gene fusion, rather than true pericyte formation. * **Glomus Tumor (Option B):** These arise from the glomus body (a specialized arteriovenous anastomosis) [1]. While glomus cells are modified smooth muscle cells related to pericytes, they appear as **monomorphic round cells** with punched-out nuclei, not the classic spindle-shaped pericyte formation seen in myopericytoma. * **Kaposi’s Sarcoma (Option A):** This is a vascular neoplasm caused by **HHV-8** [2]. It is characterized by slit-like vascular spaces, extravasated RBCs, and spindle cells of **endothelial origin**, not pericytic origin [2]. **3. High-Yield Clinical Pearls for NEET-PG:** * **Myopericytoma:** Look for the "concentric perivascular" growth pattern. * **Solitary Fibrous Tumor (formerly Hemangiopericytoma):** Key marker is **CD34+** and **STAT6** (nuclear positivity). * **Glomus Tumor:** Classically presents as a **painful, small blue-red nodule under the fingernails** (subungual). * **Pericytes:** These are contractile cells that wrap around capillaries and venules; they are identified by the marker **SMA (Smooth Muscle Actin)**. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 523-524. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 526-527.

Question 607: A patient presents with breast carcinoma, and investigations reveal involvement of the contralateral breast. What is the likely histological subtype?

A. Inflammatory carcinoma
B. Colloid carcinoma
C. Lobular carcinoma (Correct Answer)
D. In situ carcinoma

Explanation: ### Explanation **Correct Option: C. Lobular Carcinoma** Invasive Lobular Carcinoma (ILC) is uniquely characterized by its high frequency of **multicentricity** (multiple foci in the same breast) and **bilaterality** (involvement of the contralateral breast). * **The Underlying Concept:** The loss of **E-cadherin** (a cell-to-cell adhesion molecule) is the hallmark of lobular neoplasia. This lack of cohesion allows cells to infiltrate individually in a "single-file" pattern (Indian file) and increases the likelihood of diffuse, synchronous, or metachronous involvement of both breasts [1]. Approximately 10–15% of patients with ILC develop cancer in the contralateral breast. **Why other options are incorrect:** * **A. Inflammatory Carcinoma:** This is a clinical diagnosis characterized by dermal lymphatic invasion, leading to *peau d'orange* appearance. While aggressive, it is typically unilateral at presentation. * **B. Colloid (Mucinous) Carcinoma:** This subtype usually presents as a slow-growing, circumscribed mass in older women. It has a favorable prognosis and is not specifically associated with high rates of bilaterality. * **D. In situ Carcinoma:** While Lobular Carcinoma In Situ (LCIS) is a significant risk factor for bilateral disease, the question specifies "carcinoma" (implying invasive disease) and "involvement," which clinically points toward the invasive histological subtype. **High-Yield Pearls for NEET-PG:** * **Genetic Marker:** Loss of **CDH1 gene** expression (E-cadherin) is the diagnostic gold standard for Lobular Carcinoma. * **Metastatic Pattern:** Unlike Ductal Carcinoma, ILC often metastasizes to unusual sites like the **peritoneum, GI tract, leptomeninges, and ovaries.** * **Imaging:** ILC is notorious for being "mammographically silent" because it does not always form a dense, calcified mass; MRI is often more sensitive for detection [1]. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Liver And Biliary System Disease, pp. 454-455.

Question 608: Which is the most common site of metastatic disease?

A. Lung
B. Bone
C. Liver (Correct Answer)
D. Brain

Explanation: **Explanation:** The **Liver** is the most common site for blood-borne (hematogenous) metastatic disease in the body [3]. This is primarily due to its unique dual blood supply and its role as a massive filtration system. The liver receives a significant volume of systemic blood via the hepatic artery and, more importantly, drains the entire gastrointestinal tract through the **portal venous system** [3]. This makes it the primary "first-pass" filter for malignant cells originating from common primary sites like the colon, stomach, and pancreas. **Analysis of Options:** * **Liver (Correct):** Its large size, high vascularity, and fenestrated endothelium (sinusoids) facilitate the trapping and growth of circulating tumor cells [3]. Metastatic carcinoma is the most common hepatic tumour [2]. * **Lung (Incorrect):** While the lung is the **second** most common site for metastasis overall, it is the most common site for tumors that bypass the portal circulation (e.g., sarcomas, renal cell carcinoma) [3,4]. * **Bone (Incorrect):** Bone is a frequent site for specific cancers (Prostate, Breast, Lung, Thyroid, Kidney—mnemonic: **PB-KTL**), but it ranks lower than the liver in total frequency. * **Brain (Incorrect):** Though clinically devastating, brain metastases are less common than visceral metastases. **Clinical Pearls for NEET-PG:** * **Most common primary site** spreading to the liver: **Colorectal Cancer**. * **Most common tumor in the liver:** Metastatic carcinoma (much more common than primary Hepatocellular Carcinoma) [2]. * **Exceptions:** For tumors originating in the lungs, the most common site of metastasis is the **Adrenal Glands** [1]. * **Batson’s Plexus:** A valveless venous system that explains how pelvic cancers (like prostate) metastasize to the vertebral column without passing through the lungs. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, pp. 724-725. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Liver And Biliary System Disease, pp. 398-399. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, p. 282. [4] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Respiratory Tract Disease, pp. 338-339.

Question 609: Which of the following is NOT a feature of neoplastic cells?

A. Hyperchromasia
B. Pleomorphism
C. Atypical mitoses
D. Nuclear-to-cytoplasmic ratio of 1:4 (Correct Answer)

Explanation: **Explanation:** The hallmark of neoplastic cells, particularly malignant ones, is **anaplasia** (lack of differentiation) [1]. This manifests as several morphological changes in the nucleus and cytoplasm [1]. **Why Option D is the correct answer:** In normal, mature cells, the **Nuclear-to-Cytoplasmic (N:C) ratio** is typically **1:4 or 1:6**. In neoplastic cells, the nucleus enlarges significantly while the cytoplasm remains scanty, leading to an **increased N:C ratio**, often reaching **1:1**. Therefore, a ratio of 1:4 represents a normal cellular state, not a neoplastic one. **Analysis of Incorrect Options:** * **A. Hyperchromasia:** Neoplastic cells exhibit dark-staining nuclei due to an abundance of DNA and chromatin [1]. This is a classic feature of malignancy. * **B. Pleomorphism:** This refers to variation in the size and shape of both cells and nuclei [1]. It is a fundamental feature of anaplasia. * **C. Atypical mitoses:** While increased mitotic activity can occur in normal hyperplasia, the presence of **atypical (tripolar, quadripolar, or "bird’s eye") mitotic figures** is a highly specific indicator of malignancy [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Most important criterion of malignancy:** Metastasis (except for Gliomas and Basal Cell Carcinoma). * **Most reliable morphological sign of malignancy:** Invasiveness (breaching the basement membrane). * **Anaplasia vs. Dysplasia:** Anaplasia is a lack of differentiation (often irreversible) [2], whereas dysplasia is disordered growth (potentially reversible if the stimulus is removed) [2]. * **Nucleoli:** Neoplastic cells often show prominent, large nucleoli due to active RNA synthesis. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 276-278. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 278-280.

Question 610: Tumorigenesis in aging is due to

A. Telomerase reactivation (Correct Answer)
B. Telomerase inactivation
C. Increased apoptosis
D. Suppression of proto-oncogenes

Explanation: ### Explanation **Correct Option: A. Telomerase reactivation** The fundamental mechanism linking aging to tumorigenesis involves the "Telomere-Telomerase" axis. In normal somatic cells, telomeres (repetitive DNA sequences at chromosome ends) shorten with every cell division. Once they reach a critical length, the cell enters **replicative senescence** (permanent growth arrest) or apoptosis [2]. This acts as a natural tumor-suppressive mechanism. However, in cancer cells, this "molecular clock" is bypassed. Through the **reactivation of Telomerase** (hTERT), tumor cells can maintain their telomere length indefinitely [1]. This grants them **replicative immortality**, a hallmark of cancer. In the context of aging, the accumulation of mutations over time, combined with the eventual reactivation of telomerase in damaged cells, allows these cells to escape senescence and proliferate malignantly [2]. **Why other options are incorrect:** * **B. Telomerase inactivation:** This leads to progressive telomere shortening, resulting in cell death or senescence, which actually prevents tumor formation [2]. * **C. Increased apoptosis:** Apoptosis is programmed cell death. Increased apoptosis would eliminate potentially cancerous cells; tumorigenesis usually involves the *evasion* of apoptosis (e.g., BCL-2 overexpression or p53 mutation) [3]. * **D. Suppression of proto-oncogenes:** Proto-oncogenes promote normal growth. Their *activation* (into oncogenes), not suppression, drives tumorigenesis. **High-Yield Clinical Pearls for NEET-PG:** * **Telomerase Activity:** Present in >90% of human cancers, germ cells, and stem cells; absent in most somatic cells [1]. * **Bridge-Fusion-Breakage Cycle:** If p53 is absent, critically short telomeres lead to chromosomal instability, which facilitates the acquisition of mutations before telomerase is reactivated to "fix" the genome in a cancerous state [2]. * **Alternative Lengthening of Telomeres (ALT):** A telomerase-independent mechanism some tumors use to maintain telomeres via DNA recombination [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 311-312. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, p. 312. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 310-311.

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