Clab 450 Neoplasia and Immunopathology: Tumor Types, Carcinogenesis, and Immune Responses

What is neoplasia?

Neoplasia is the process of abnormal and uncontrolled cell growth, which can lead to tumors.

Define tumor.

A tumor is an abnormal mass of tissue that forms when cells divide excessively.

What is the difference between benign and malignant tumors?

Benign tumors are non-cancerous and do not invade surrounding tissues, while malignant tumors are cancerous and can invade nearby tissues and metastasize.

What does metastasis mean?

Metastasis is the spread of cancer cells from the original tumor to other parts of the body.

What is the TNM system?

The TNM system is a classification system for staging tumors based on Tumor size (T), Node involvement (N), and Metastasis (M).

List common forms of carcinoma.

Common forms of carcinoma include adenocarcinoma, squamous cell carcinoma, and transitional cell carcinoma.

What are oncogenes?

Oncogenes are mutated forms of proto-oncogenes that promote cell growth and division, leading to cancer.

What are tumor suppressor genes?

Tumor suppressor genes are genes that protect cells from becoming cancerous by regulating cell division and repairing DNA.

Describe the immune response to neoplasia.

The immune response to neoplasia involves the recognition and elimination of cancer cells by immune cells, although tumors can evade this response.

What is the significance of tumor-associated antigens?

Tumor-associated antigens are proteins expressed on the surface of tumor cells that can be targeted by the immune system for cancer therapy.

What are the local effects of tumors?

Local effects of tumors can include obstruction of organs, pain, and tissue destruction.

What are systemic effects of tumors?

Systemic effects of tumors can include weight loss, fatigue, and paraneoplastic syndromes.

What is the role of environmental carcinogens in cancer?

Environmental carcinogens, such as chemicals and radiation, can cause mutations that lead to cancer.

What is carcinogenesis?

Carcinogenesis is the process by which normal cells are transformed into cancer cells.

What are some examples of viral carcinogens?

Examples of viral carcinogens include human papillomavirus (HPV), Epstein-Barr virus (EBV), and hepatitis B virus (HBV).

What is the difference between incidence and prevalence in cancer statistics?

Incidence refers to the number of new cancer cases in a specific time period, while prevalence refers to the total number of existing cases at a given time.

What are paraneoplastic syndromes?

Paraneoplastic syndromes are symptoms that occur in cancer patients due to the production of hormones or other substances by the tumor.

What is the significance of the P53 tumor suppressor gene?

The P53 gene is crucial for regulating the cell cycle and preventing tumor formation; mutations in P53 are common in many cancers.

What is the role of tumor grading?

Tumor grading assesses the differentiation of cancer cells and helps predict the aggressiveness of the tumor.

What is the difference between histologic and clinical classification of tumors?

Histologic classification is based on the microscopic appearance of tumor cells, while clinical classification is based on the tumor's behavior and spread.

What are teratomas?

Teratomas are tumors derived from germ cells that can contain tissues from all three germ layers.

What is the role of angiogenesis in tumors?

Angiogenesis is the process by which tumors stimulate the formation of new blood vessels to supply nutrients for their growth.

What are eponymic tumors?

Eponymic tumors are named after the physicians who first described them, such as Hodgkin's disease.

What is the significance of alpha-fetoprotein (AFP) in cancer?

AFP is a tumor marker associated with hepatocellular carcinoma and certain germ cell tumors.

What are the main contributions of cancer epidemiology?

Cancer epidemiology helps identify risk factors, understand cancer trends, and develop prevention strategies.

What is the role of autocrine stimulation in cancer cell growth?

Autocrine stimulation allows cancer cells to produce their own growth factors, promoting uncontrolled growth.

What are the two main types of immunity?

Innate immunity and acquired immunity.

What are the main organs involved in the immune response?

Thymus, spleen, lymph nodes, and bone marrow.

What are the primary types of lymphocytes?

B cells, T cells, and natural killer cells.

What is the function of immunoglobulins?

They react with antigens to help neutralize or eliminate them.

What is the role of the major histocompatibility complex (MHC)?

It is essential for the presentation of antigens to T-cells.

What are the four mechanisms of hypersensitivity reactions?

Type I (anaphylactic), Type II (cytotoxic), Type III (immune complex), and Type IV (cell-mediated).

What is a Type I hypersensitivity reaction?

An anaphylactic reaction that can induce conditions like hay fever and asthma.

What diseases are associated with Type II hypersensitivity?

Hemolytic anemia, myasthenia gravis, and Graves' disease.

What is a Type III hypersensitivity reaction?

An immune complex-mediated reaction that can lead to systemic lupus erythematosus and poststreptococcal glomerulonephritis.

What is the significance of T and B lymphocyte maturation?

They are crucial for the adaptive immune response.

What are the five classes of immunoglobulins?

IgG, IgM, IgA, IgE, and IgD.

What is the structure of antibodies?

Composed of light and heavy chains, with constant (Fc) and variable (Fab) regions.

What types of transplants are there?

Homograft, isograft, autograft, and xenograft.

What is Rh incompatibility?

A condition where the mother's blood type is incompatible with that of the fetus, leading to potential complications.

What are common clinical features of Rh factor incompatibility?

Hydrops fetalis, erythroblastosis fetalis, and kernicterus.

What are primary immunodeficiency diseases?

Congenital conditions that affect the immune system.

What is AIDS?

Acquired immunodeficiency syndrome caused by the human immunodeficiency virus (HIV).

What is the main complication of AIDS?

Opportunistic infections due to a weakened immune system.

What is amyloid?

Inert extracellular material that can deposit in various organs, causing systemic amyloidosis.

What are the clinical presentations of amyloid deposition?

Systemic amyloidosis affecting organs like the liver and kidneys, and localized deposits such as in Alzheimer's disease.

What is the importance of crossmatching in blood transfusion?

It ensures compatibility between donor and recipient blood to prevent transfusion reactions.

What is the difference between acute and chronic transplant rejection?

Acute rejection occurs soon after transplantation, while chronic rejection develops over time.

What is the role of antibodies in antigen-antibody reactions?

They bind to antigens to form complexes that activate the complement system and mediate immune responses.

What is the significance of properdin and lysozyme in the immune system?

They are part of the innate immune response that helps protect against infections.

What is the clinical use of transplantation?

Transplants can be used for organs like the kidney, liver, heart, and bone marrow.

What are the effects of Type IV hypersensitivity reactions?

They can cause delayed reactions such as contact dermatitis and granuloma formation.

What is the pathogenesis of autoimmune diseases?

They arise from an inappropriate immune response against self-antigens.