Molecular Pathology — MCQs

Molecular Pathology Indian Medical PG Practice Questions and MCQs

Question 81: Which of the following is a squamous cell carcinoma marker?

A. Vimentin
B. Dermin
C. Cytokeratin (Correct Answer)
D. Glial fibrillary acid protein

Explanation: **Explanation:** The correct answer is **Cytokeratin (C)**. **1. Why Cytokeratin is correct:** Cytokeratins (CK) are intermediate filaments found specifically in the intracytoplasmic cytoskeleton of **epithelial tissue**. Since Squamous Cell Carcinoma (SCC) is a malignant tumor derived from the epithelium, it characteristically expresses cytokeratin [1]. In pathology, Immunohistochemistry (IHC) for CK is the gold standard to confirm the epithelial origin of a poorly differentiated tumor. Specific subtypes like **p40** and **p63** are further used as highly specific markers for squamous differentiation. **2. Why the other options are incorrect:** * **Vimentin (A):** This is the intermediate filament characteristic of **mesenchymal cells** [1]. It is a marker for sarcomas (e.g., osteosarcoma, angiosarcoma) and is also expressed in normal fibroblasts, endothelium, and leukocytes. * **Desmin (B):** This is a marker for **muscle cells** (both skeletal and smooth muscle). It is used to identify tumors like Rhabdomyosarcoma or Leiomyosarcoma. * **Glial Fibrillary Acidic Protein (GFAP) (D):** This is the intermediate filament found in **glial cells** (astrocytes and ependymal cells). It is the primary marker for CNS tumors such as Astrocytomas and Glioblastomas. **High-Yield Clinical Pearls for NEET-PG:** * **Epithelial markers:** Cytokeratin, EMA (Epithelial Membrane Antigen). * **Melanoma markers:** S-100, HMB-45, Melan-A. * **Neuroendocrine markers:** Chromogranin A, Synaptophysin, CD56. * **Vascular markers:** CD31, CD34, Factor VIII-related antigen. * **Prostate marker:** PSA (Prostate Specific Antigen). **References:** [1] 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. 208-211.

Question 82: Which of the following is NOT seen in Fragile X syndrome?

A. Testicular enlargement
B. Cause of mental retardation
C. Trinucleotide repeat mutations
D. Genomic imprinting (Correct Answer)

Explanation: **Explanation:** **Fragile X Syndrome (FXS)** is the most common inherited cause of intellectual disability [1]. The underlying molecular mechanism is a **trinucleotide repeat expansion** (CGG) in the 5' untranslated region of the ***FMR1* gene** on the X chromosome [1][2]. **Why Genomic Imprinting is the Correct Answer:** Genomic imprinting involves the differential expression of a gene depending on whether it is inherited from the mother or the father (e.g., Prader-Willi and Angelman syndromes) [3]. Fragile X syndrome does **not** involve imprinting. Instead, it is characterized by **transcriptional silencing** via DNA methylation once the CGG repeats exceed a threshold (full mutation >200 repeats) [1]. It also exhibits **anticipation**, where the disease becomes more severe or has an earlier onset in successive generations. **Analysis of Incorrect Options:** * **A. Testicular enlargement:** Post-pubertal **macro-orchidism** is a hallmark clinical feature of Fragile X syndrome [1]. * **B. Cause of mental retardation:** It is the second most common genetic cause of intellectual disability after Down syndrome and the **most common inherited cause** [4]. * **C. Trinucleotide repeat mutations:** FXS is the classic example of a trinucleotide repeat disorder (CGG) [2]. Other examples include Huntington’s (CAG) and Friedreich’s ataxia (GAA). **High-Yield Clinical Pearls for NEET-PG:** * **Gene:** *FMR1* (Fragile X Mental Retardation 1) [1]. * **Protein:** FMRP (essential for synaptic plasticity) [1]. * **Cytogenetics:** Seen as a "break" or gap at the end of the long arm of the X chromosome (Xq27.3) when cultured in folate-deficient medium. * **Clinical Triad:** Long face with large mandible, large everted ears, and macro-orchidism. * **Premutation (55-200 repeats):** Associated with Fragile X-associated tremor/ataxia syndrome (FXTAS) and primary ovarian insufficiency [4]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Genetic Disorders, pp. 179-181. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Genetic Disorders, p. 177. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Genetic Disorders, pp. 182-183. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Genetic Disorders, pp. 177-179.

Question 83: Molecular study is important in the management of which malignancy?

A. Multiple myeloma (Correct Answer)
B. Renal cell carcinoma
C. Seminoma
D. Basal cell carcinoma

Explanation: Explanation: Molecular studies, specifically **Fluorescence In Situ Hybridization (FISH)** and cytogenetics, are fundamental to the management of **Multiple Myeloma (MM)** [1][2]. Unlike many other cancers where diagnosis is primarily morphological, the management of MM is dictated by molecular risk stratification. [2] **1. Why Multiple Myeloma is Correct:** Molecular profiling is mandatory for determining prognosis and choosing therapeutic intensity. High-risk molecular markers include **del(17p)** (loss of TP53), **t(4;14)**, and **t(14;16)**. Conversely, t(11;14) is considered standard risk. These findings guide the use of specific proteasome inhibitors or stem cell transplant eligibility, making molecular study indispensable for clinical decision-making. **2. Why the other options are incorrect:** * **Renal Cell Carcinoma (RCC):** Diagnosis and management are primarily based on TNM staging and histological subtypes (Clear cell, Papillary). While VHL mutations exist [3], they are not routinely used to guide standard clinical management. * **Seminoma:** Management is based on clinical staging and tumor markers (hCG). Molecular studies do not currently dictate the standard of care. * **Basal Cell Carcinoma (BCC):** Diagnosis is clinical and histological. While the Hedgehog pathway (PTCH1 mutation) is involved, molecular testing is rarely required for management, as local excision or topical therapy is standard. **High-Yield Clinical Pearls for NEET-PG:** * **FISH on Bone Marrow:** The gold standard for risk stratification in MM. [2] * **Revised ISS (R-ISS):** Incorporates cytogenetics [del(17p), t(4;14), t(14;16)] along with LDH and ISS stage. * **TP53 deletion [del(17p)]:** The most significant adverse prognostic factor in Multiple Myeloma. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of White Blood Cells, Lymph Nodes, Spleen, and Thymus, pp. 608-609. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 342-343. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 325-326.

Question 84: The DNA nick and labelling (in situ) technique is used to quantify which of the following?

A. The amount of total DNA in mitochondria
B. The fraction of nucleic acids
C. The fraction of cells in the apoptotic pathway (Correct Answer)
D. The fraction of cells in meiotic division

Explanation: ### Explanation The **DNA nick and labeling technique**, commonly known as **TUNEL** (Terminal deoxynucleotidyl transferase dUTP Nick End Labeling), is a gold-standard method for detecting and quantifying **apoptosis** (programmed cell death). **1. Why Option C is Correct:** A hallmark of apoptosis is the activation of endogenous endonucleases, which cleave genomic DNA into short fragments (180–200 base pairs), creating a "DNA ladder" on electrophoresis. This process leaves numerous **3'-hydroxyl (OH) ends** (nicks) in the DNA. The TUNEL assay uses the enzyme **Terminal deoxynucleotidyl transferase (TdT)** to attach labeled nucleotides (like dUTP) to these 3'-OH ends. By measuring the intensity of the label, clinicians can quantify the fraction of cells undergoing apoptosis. **2. Why Other Options are Incorrect:** * **Option A:** Mitochondrial DNA is typically quantified using qPCR or Southern Blotting, not by labeling DNA nicks. * **Option B:** Nucleic acid fractions (DNA vs. RNA) are measured using spectrophotometry (A260/A280 ratio) or specific dyes like Ethidium Bromide. * **Option C:** Meiotic division is studied via karyotyping or flow cytometry to assess DNA ploidy (n vs. 2n), not by DNA fragmentation. **3. High-Yield Clinical Pearls for NEET-PG:** * **DNA Laddering:** A classic feature of apoptosis seen on agar gel electrophoresis. In contrast, **Necrosis** shows a "smear" pattern due to random DNA degradation. * **Caspase-3:** Known as the "Executioner Caspase," it is the primary enzyme responsible for activating the endonucleases that create the nicks detected by TUNEL. * **Annexin V:** Another marker for apoptosis; it binds to **Phosphatidylserine**, which flips from the inner to the outer leaflet of the plasma membrane during early apoptosis.

Question 85: What is the most common microdeletion syndrome?

A. WAGR syndrome
B. Velocardiofacial (VCF) syndrome (Correct Answer)
C. Prader-Willi syndrome
D. Angelman syndrome

Explanation: **Explanation:** **Velocardiofacial (VCF) syndrome**, also known as **DiGeorge syndrome** or **22q11.2 deletion syndrome**, is the most common microdeletion syndrome in humans, occurring in approximately 1 in 4,000 live births [1]. It is caused by a microdeletion on the long arm of chromosome 22 (22q11.2) [1]. The clinical spectrum is broad, often remembered by the mnemonic **CATCH-22**: **C**ardiac defects (Tetralogy of Fallot), **A**bnormal facies, **T**hymic hypoplasia (T-cell deficiency), **C**left palate, and **H**ypocalcemia (due to parathyroid hypoplasia). **Analysis of Incorrect Options:** * **WAGR Syndrome:** Caused by a microdeletion at **11p13**. It is much rarer than 22q11.2 deletion and is characterized by **W**ilms tumor, **A**niridia, **G**enitourinary anomalies, and mental **R**etardation. * **Prader-Willi Syndrome (PWS):** Caused by the loss of the **paternal** copy of the **15q11-q13** region (via microdeletion or uniparental disomy) [2]. While common, its incidence (1:15,000) is lower than VCF syndrome. * **Angelman Syndrome:** Caused by the loss of the **maternal** copy of the same **15q11-q13** region (UBE3A gene) [2]. Like PWS, it is less frequent than VCF syndrome. **High-Yield Clinical Pearls for NEET-PG:** * **Diagnosis:** The gold standard for detecting microdeletions is **Fluorescence In Situ Hybridization (FISH)** or Chromosomal Microarray (CMA), as they are too small to be seen on a standard karyotype [1]. * **Embryology:** VCF syndrome results from the defective development of the **3rd and 4th pharyngeal pouches**. * **Psychiatry Link:** Patients with 22q11.2 deletion have a significantly high risk (up to 25%) of developing **Schizophrenia** in adulthood [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Genetic Disorders, pp. 172-173. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Genetic Disorders, pp. 181-183.

Question 86: Metaplasia arises from the reprogramming of which type of cell?

A. Stem cells (Correct Answer)
B. Stellate cells
C. Squamous cells
D. Columnar cells

Explanation: **Explanation:** **1. Why Stem Cells are correct:** Metaplasia is a reversible change in which one differentiated cell type (epithelial or mesenchymal) is replaced by another cell type [1]. Crucially, this does not occur by a differentiated cell "changing its shape." Instead, it is the result of a **reprogramming of tissue stem cells** (or undifferentiated mesenchymal cells in connective tissue) [1]. Under the influence of cytokines, growth factors, and extracellular matrix components, these stem cells are triggered to differentiate along a new pathway [1]. For example, in Barrett’s esophagus, chronic acid reflux causes esophageal squamous stem cells to reprogram into columnar cells. **2. Why the other options are incorrect:** * **Stellate cells:** These are specialized cells found primarily in the liver (Ito cells) responsible for Vitamin A storage and, when activated, fibrosis. They are not the source of generalized epithelial metaplasia. * **Squamous and Columnar cells:** These are **fully differentiated cells**. Once a cell has reached its terminal differentiation state, it cannot "morph" directly into another cell type [1]. The change must occur at the precursor (stem cell) level before the new cell is born [1]. **3. Clinical Pearls for NEET-PG:** * **Most common epithelial metaplasia:** Squamous metaplasia (e.g., in the respiratory tract of smokers where columnar cells are replaced by squamous cells) [1], [2]. * **Barrett’s Esophagus:** A classic example of **columnar metaplasia** (squamous to columnar). * **Connective Tissue Metaplasia:** Formation of bone in soft tissue (e.g., **Myositis ossificans**) is a mesenchymal metaplasia. * **Double-edged sword:** While metaplasia is a protective response to stress, if the stimulus persists, it can serve as a soil for **malignant transformation** (dysplasia to neoplasia) [1]. * **Vitamin A deficiency:** Can induce squamous metaplasia in the respiratory tract and eyes (Xerophthalmia). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Cellular Responses to Stress and Toxic Insults: Adaptation, Injury, and Death, p. 49. [2] 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. 91-92.

Question 87: To which of the following does integrin bind?

A. Fibronectin
B. Vitronectin
C. Collagen
D. Laminin (Correct Answer)

Explanation: **Explanation:** **Integrins** are transmembrane heterodimeric glycoproteins (composed of $\alpha$ and $\beta$ subunits) that serve as the primary receptors for cell-extracellular matrix (ECM) interactions [1]. They play a critical role in cell adhesion, migration, and signal transduction [1]. **Why Laminin is the correct answer:** While integrins are versatile and can bind to various ECM components, they are the **primary receptors for Laminin** [1]. Laminin is a major glycoprotein found in the **basal lamina**. The binding of integrins to laminin is essential for anchoring epithelial cells to the basement membrane, maintaining tissue architecture, and regulating cell differentiation. **Analysis of Incorrect Options:** * **Fibronectin (A):** Although integrins (specifically the $\alpha_5\beta_1$ subtype) do bind to fibronectin via the **RGD (Arg-Gly-Asp) sequence** [1], in the context of standard pathology textbooks (like Robbins), the classic association for integrins in the basement membrane is with laminin. * **Vitronectin (B):** This is a plasma and ECM protein that binds to the $\alpha_v\beta_3$ integrin (the vitronectin receptor). It is primarily involved in coagulation and fibrinolysis rather than primary structural cell anchoring. * **Collagen (C):** While some integrins ($\alpha_1\beta_1$ and $\alpha_2\beta_1$) bind to collagen, collagen primarily interacts with other receptors like discoidin domain receptors (DDRs) or glycoprotein VI in platelets. **NEET-PG High-Yield Pearls:** 1. **RGD Sequence:** Many ECM proteins (Fibronectin, Vitronectin, VWF) bind to integrins through the tripeptide sequence **Arginine-Glycine-Aspartic acid (RGD)** [1]. 2. **Glanzmann Thrombasthenia:** A clinical condition caused by a deficiency of **GP IIb/IIIa** (an integrin), leading to defective platelet aggregation [1]. 3. **Leukocyte Adhesion Deficiency (LAD) Type 1:** Caused by a defect in the **$\beta_2$ chain (CD18)** of integrins (LFA-1/MAC-1), resulting in impaired leukocyte migration and recurrent bacterial infections [1]. 4. **Inside-Out Signaling:** A unique feature of integrins where intracellular signals trigger a conformational change that increases the receptor's affinity for external ligands. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. With Illustrations By, pp. 36-37.

Question 88: In an ablated animal, if Myeloid Stem Cells are injected, which type of cells are induced after the incubation period?

A. T-Lymphocyte
B. Erythroid (Correct Answer)
C. Fibroblast
D. Hematopoietic Stem Cells

Explanation: **Explanation:** The core concept tested here is the **differentiation hierarchy of hematopoiesis**. Hematopoietic Stem Cells (HSCs) are multipotent cells that give rise to two main lineages: the Common Lymphoid Progenitor (CLP) and the **Common Myeloid Progenitor (CMP)** [1]. 1. **Why Erythroid is correct:** Myeloid stem cells (CMPs) are "committed" progenitors. According to the classical model of hematopoiesis, the myeloid lineage specifically differentiates into **erythrocytes (erythroid cells)**, megakaryocytes (platelets), granulocytes (neutrophils, eosinophils, basophils), and monocytes [1]. Therefore, injecting myeloid stem cells into an ablated animal will result in the production of these specific cell types, with erythroid cells being a primary derivative [2]. 2. **Why other options are incorrect:** * **T-Lymphocytes:** These are derived from the **Lymphoid** stem cell line (CLP), not the myeloid line [1]. * **Fibroblasts:** These are mesenchymal cells derived from **Mesenchymal Stem Cells (MSCs)**, not hematopoietic lineages. * **Hematopoietic Stem Cells:** These are the *precursors* to myeloid cells. A committed myeloid stem cell cannot "revert" or be induced into a multipotent HSC under normal physiological conditions (differentiation is generally a one-way street) [1]. **High-Yield NEET-PG Pearls:** * **HSC Markers:** CD34+ and CD117+ (c-kit) are the most characteristic markers for identifying hematopoietic stem cells. * **Erythropoietin (EPO):** The primary cytokine driving the myeloid progenitor toward the erythroid lineage [3]. * **Site of Hematopoiesis:** In adults, it occurs in the red bone marrow (membranous bones); in the fetus, the liver is the chief site between 2–7 months of gestation. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, pp. 588-589. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 585-586. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 586-587.

Question 89: What is the specific chromosomal translocation associated with synovial sarcoma?

A. t(x;18) (Correct Answer)
B. t(9;22)
C. t(11;14)
D. t(14;18)

Explanation: **Explanation:** **Correct Option: A. t(x;18)** Synovial sarcoma is characterized by a highly specific reciprocal translocation, **t(X;18)(p11;q11)** [1]. This translocation results in the fusion of the *SS18* (formerly *SYT*) gene on chromosome 18 with one of the *SSX* genes (*SSX1*, *SSX2*, or *SSX4*) on the X chromosome [1]. The resulting **SS18-SSX fusion protein** acts as an aberrant epigenetic regulator, disrupting chromatin remodeling (SWI/SNF complex) and driving oncogenesis. This translocation is present in >95% of cases, making it a "gold standard" for diagnosis via FISH or RT-PCR. **Analysis of Incorrect Options:** * **B. t(9;22):** Known as the **Philadelphia chromosome**, it creates the *BCR-ABL1* fusion gene [3]. It is the hallmark of Chronic Myeloid Leukemia (CML) and a subset of Acute Lymphoblastic Leukemia (ALL) [3]. * **C. t(11;14):** This involves the *CCND1* (Cyclin D1) gene and the IgH locus. It leads to overexpression of Cyclin D1 and is characteristic of **Mantle Cell Lymphoma**. * **D. t(14;18):** This involves the *BCL2* gene and the IgH locus [2]. It leads to the overexpression of the anti-apoptotic protein BCL2, characteristic of **Follicular Lymphoma** [2]. **High-Yield Clinical Pearls for NEET-PG:** * **Demographics:** Synovial sarcoma typically affects young adults (15–40 years) [1]. * **Location:** Despite the name, it rarely arises *within* a joint; it usually occurs in the deep soft tissues of the extremities near joints [1]. * **Morphology:** It can be **Biphasic** (spindle cells + epithelial cells forming glands) or **Monophasic** (spindle cells only) [1]. * **Immunohistochemistry (IHC):** Characteristically positive for **TLE1**, Cytokeratin, and EMA. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Bones, Joints, and Soft Tissue Tumors, pp. 1225-1226. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of White Blood Cells, Lymph Nodes, Spleen, and Thymus, pp. 602-604. [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. 225-226.

Question 90: All are present in Fragile X syndrome, except:

A. Mental retardation and microorchidism
B. Mental retardation and microorchidism
C. Mental retardation and macroorchidism (Correct Answer)
D. Microorchidism and large facies

Explanation: **Explanation:** Fragile X syndrome is the most common inherited cause of intellectual disability (mental retardation) and the second most common genetic cause after Down syndrome [1]. It is caused by a **CGG trinucleotide repeat expansion** in the *FMR1* gene on the X chromosome, leading to transcriptional silencing [1]. **Why the correct answer is "Mental retardation and macroorchidism":** The question asks for the clinical features present in Fragile X. The hallmark triad of Fragile X syndrome includes **Mental retardation**, a long face with a large mandible (**large facies**), and **Macroorchidism** (enlarged testes). Macroorchidism typically becomes evident post-puberty and is a classic diagnostic clue in medical exams. **Analysis of Options:** * **Macroorchidism vs. Microorchidism:** Fragile X is characterized by *enlarged* testes (Macroorchidism). Therefore, any option containing **Microorchidism** (small testes) is clinically incorrect for this syndrome. Microorchidism is more commonly associated with conditions like Klinefelter syndrome (47, XXY). * **Mental Retardation:** This is a consistent feature of the syndrome due to the lack of FMRP (Fragile X Mental Retardation Protein), which is essential for normal cognitive development [1]. * **Large Facies:** Patients typically exhibit a long, narrow face, prominent forehead, and large everted ears. **NEET-PG High-Yield Pearls:** 1. **Genetics:** It follows an X-linked dominant inheritance with variable expressivity and **Anticipation** (symptoms become more severe in successive generations). 2. **Molecular Mechanism:** Full mutation occurs when CGG repeats exceed **200**. This leads to **hypermethylation** of the promoter region [1]. 3. **Cytogenetics:** When cells are cultured in a folate-deficient medium, the X chromosome shows a "break" or gap at the end of the long arm (q27.3). 4. **Other Features:** Mitral valve prolapse, joint hypermobility, and autistic-like behaviors. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Genetic Disorders, pp. 179-181.

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Principles of Molecular Pathology

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Molecular Diagnosis of Infectious Diseases

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Molecular Oncology

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Pharmacogenomics

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Genetic Counseling and Risk Assessment

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Molecular Diagnostics Quality Control

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