Cancer Flashcards
“disease in which abnormal cells divide without control and can invade nearby tissues and to the other parts of the tissues through blood and lymphatic system” = ?
Cancer
Cancer: “disease in which abnormal cells divide without control and can invade nearby tissues and to the other parts of the tissues through blood and lymphatic system” - CDC
Top 3 most common cancers in US = ?
Cancer
- Lung and bronchus
- Female breast
- Prostate
Hallmarks of Cancer = ?
Cancer
Hallmarks of Cancer:
- Self-sufficiency in growth signals
- Insensitivity to anti-growth signals
- Tissue invasion & metastasis
- Limitless replicative potential
- Sustained angiogenesis
- Evading apoptosis
Types of tumors include = ?
Cancer
Types of Tumors:
(1) Benign tumors stays confined to its original location.
(2) Malignant tumors are capable of invading surrounding tissue or invading the entire body.
- Lymphatic system
- Blood vessel
The spread of cancer cells from the place where they first formed to another part of the body = ?
Cancer
Metastasis: The spread of cancer cells from the place where they first formed to another part of the body.
Most common site for metastasis = ?
Cancer
Common Sites of Metastasis:
(a) Bone, Liver, Lung: most common site for metastasis
- Most people have multiple sites of metastasis and not all of which presents at any one time.
Anatomic Site Classification:
- Benign tumor = ?
- Malignant tumors = ?
- Leukemias and lymphomas= ?
Cancer
Anatomic Site Classification:
(a) Named according to the tissues from which they originated:
(i) Benign tumor (suffix “oma”) and non-malignant in nature.
- Chondroma
- Adenoma (“adeno-” means gland-like)
- Lipoma (“lipo-” means fat)
(ii) Malignant tumors (carcinoma or sarcoma) invasive and malignant in nature
- Carcinomas: are cancers of epithelial cells (constitute 85-90% of cancers)
- Sarcomas: are cancers of connective tissues (connective tissue, cartilage, muscle, bone etc.)
(iii) Leukemias and lymphomas: are cancer of blood forming cells (bone marrow and blood) and immune system (T and B cells) respectively (constitute 8% of tumors).
Cell proliferation = ?
Cell differentiation = ?
Cancer
(a) Cell proliferation:
- Increase in cell number by mitotic cell division
(b) Cell differentiation:
- Proliferating cells become progressively more specialized cell types
- Results in fully differentiated adult cell that has specific set of structural and functional properties
(c) Notes:
- Cancer is a disorder of altered cell differentiation and growth
Benign and malignant neoplasm are distinguished by = ?
Cancer
(a) Benign and malignant neoplasm are distinguished by the following:
- Cell characteristics
- Rate of growth
- Manner of growth
- Capacity to invade and metastasize
- Neoplasm = An abnormal mass of tissue that forms when cells grow and divide more than they should or do not die when they should.
Benign vs. Malignant:
- Cell characteristics = ?
- Rate of growth = ?
- Mode of growth = ?
- Metastasis = ?
Cancer
Benign vs. Malignant:
Benign:
(-) Cell characteristics = Well differentiated that resemble cells in the tissue of origin
(-) Rate of growth = Usually progressive and slow, may come to standstill / regress.
(-) Mode of growth = Grows by expansion without evading the surrounding tissue, usually encapsulated.
(-) Metastasis = Does not spread by metastasis.
Malignant:
(-) Cell characteristics = Cells are undifferentiated with anaplasia and atypical structures that often bears little resembles to the cells in the tissue of origin
(-) Rate of growth = Variable; more undifferentiated the cells more rapid the rate of growth
(-) Mode of growth = Grows by invasion, sending out process that infiltrate the surrounding tissue.
(-) Metastasis = Gains access to blood, lymph channels to metastasize to other parts of body.
Cancer:
Diagnostic methods include = ?
Cancer
Diagnostic methods:
- Blood tests for tumor markers
- Cytological studies and tissue biopsy
- Endoscopic examination
- Ultrasonography
- X ray studies
- MRI
- CT
- PET
Grading of Cancer:
- Grade #1 = ?
- Grade #2 = ?
- Grade #3 = ?
- Grade #4 = ?
Cancer
Histologic Analysis Classification:
(a) Based on cellular appearance and differentiation
- Grade 1: Differ slightly from normal; well differentiated
- Grade 2: More abnormal; moderately differentiated
- Grade 3: Poorly differentiated
- Grade 4: Immature, primitive and undifferentiated cells; difficult to determine cell of origin.
Clinical Staging:
- 0 = ?
- 1 = ?
- 2 = ?
- 3 = ?
- 4 = ?
Cancer
Clinical Staging:
- 0: Cancer small and in situ (situ means in it’s original space)
- 1: Tumor limited to tissue of origin
- 2: Limited local spread
- 3: Extensive local and regional spread
- 4: Metastasis
Tumor Markers:
- Tumor cell markers (biologic markers) are = ?
- Screening includes = ?
Cancer
Tumor Markers:
(a) Tumor cell markers (biologic markers) are antigens expressed on the surface of tumor cells or substances produced by cancer cells or normal cells in response to presence of tumor
(b) Screening, establishing prognosis, monitoring treatment and detecting recurrent disease
- Hormones
- Enzymes
- Genes (B-Rraf, K-Ras etc)
- Antigens (PSA – in blood, prostate cancer)
- Antibodies
Process of Cancer Development = ?
3 stages
Cancer
Process of Cancer Development:
- Exposure of cells to carcinogenic agents that causes them to be vulnerable to cancer transformation.
- Growth of cells
- Tumor cells acquire malignant phenotypic changes
Risk factor:
- Modifiable = ?
- Non modifiable = ?
Cancer
Risk factor:
(a) Modifiable:
- Smoking, tobacco use
- Chemical exposure like paint, dye, rubber, asbestos, radon, ionizing radiations, herbicides, pesticides
- Alcohol consumption (> 1-2 drinks/ day)
- Sedentary lifestyle
- Obesity
- Diet
- Radiations
- STDs/ viruses
- Vitamin B12 deficiency
- Lack of access to use of health care and screening tests
(b) Non modifiable:
- Age
- Previous cancer
- Ethnicity
- Gender
- Heredity / genetics
- Congenital diseases / immunodeficiency
Seven Warning Signs of Cancer = ?
CAUTION
Cancer
Seven Warning Signs of Cancer:
- Change in bowel or bladder habits
- A sore throat that does not heal
- Unusual bleeding or discharge from body orifice
- Thickening or lump in breast or elsewhere
- Indigestion or difficulty in swallowing
- Obvious change in wart or mole
- Nagging cough or hoarseness
Clinical Manifestations of Cancer = ?
Cancer
Clinical Manifestations of Cancer:
- Cancer in earliest stages are asymptomatic.
- As cancer progresses, symptoms characteristic of involved organ / tissue start to develop.
- Rapid growth encroaches healthy tissue- destruction, necrosis, hemorrhage.
- Continued spread- GI, vascular obstruction, brain, neurologic, MSK, hepatic, pulmonary, integumentary.
- Cancer pain
- Cancer related fatigue
- Paraneoplastic syndromes
- Cancer related anorexia / cachexia