Exam 2 (Ch. 14, 16, & 34) PPT Flashcards
The incidence of cancer increases significantly with age, with most cases diagnosed in individuals over 55. However, cancer can develop at any age, and 1.7 million people in the US are diagnosed with invasive cancers annually. What is the most likely explanation for the observation that both the incidence and mortality rates of cancer are declining overall?
A. Improvements in early detection and treatment
B. A decrease in environmental risk factors
C. Increased use of preventative measures and healthier lifestyles
D. All of the above
D. All of the above.
- A. Screening can catch cancers at earlier, at more treatable stages. Advances have also improved survival rates.
- B. Public health campaigns have raised awareness about risks e.i. smoking, excessive sun exposure, and exposure to carcinogens. This has led to changes in behaviors & policies that reduce exposure to risks.
- C. More people are adopting healthier lifestyles, including regular exercise, a balanced diet, and maintaining a healthy weight. Preventative measures like vaccinations and chemoprevention are also contributing to lower cancer rates.
Overall, cancer inicdence is higher in which gender?
Males
More men than women dies from cancer-related death each year.
Men more likely to develop liver cancer
Prostate cancer is the highest incidence
Head & neck cancers are more common in men
Which cancer has the highest death rate in both men & women?
Lung
What are some biologic sex considerations for cancer in women?
- Highest incidence is breast cancer
- Thyroid cancer is more prevalent in women
- Women are less likely to have colon cancer screenings
What are the 2 major dysfunction present in the process of cancer developement?
Defective cell proliferation (growth) & defective cell differentiation
What does metastasis mean?
Abnormal cells invade surrounding tissue & gain access to lymph & blood vessels carrying them to other areas of the body
What does benigin mean?
Cells that are not cancerous
What are the 3 stages of cancer?
- Initiation: Involves a mutation in cell structure
- Promtion: is characterized by the reversible proliferation of altered cells (an increase in the altered cell population further increases the likelihood of more mutations)
- Progression: increased growth rate of the tumor, increased invasiveness and metastasis
Which of the following statements BEST describes the current understanding of cancer development?
A. Cancer arises from a rapid, haphazard event leading to uncontrolled cell growth.
B. Cancer development is typically an orderly, multi-stage process involving genetic changes.
C. Cancer cells develop spontaneously without any changes in normal cellular processes.
D. Cancer is primarily caused by external factors and does not involve genetic alterations.
B. Cancer development is typically an orderly, multi-stage process involving genetic changes.
Which of the following statements BEST describes the role of tumor suppressor genes in cancer development?
A. Tumor suppressor genes promote cell growth and division.
B. Mutations in tumor suppressor genes can lead to uncontrolled cell growth.
C. Inherited mutations in tumor suppressor genes account for the majority of cancers.
D. Tumor suppressor genes are responsible for repairing damaged DNA.
B. Mutations in tumor suppressor genes can lead to uncontrolled cell growth.
Where do most cancers result from?
From damage to genes occurring during one’s lifetime
Not from inherited genes
What are the 3 types of carcinogens?
- Chemical (e.g., benzene, arsenic, formaldehyde, acetone)
- Radiation (e.g. UV rays, X-ray)
- Viral (DNA or RNA viruses) (e.g. HPV, HBV, HIV, Epstein-Barr)
Cell growth, protein synthesis, and preparation for DNA replication.
Describes what phase of the cell cycle?
G1 Phase
DNA replication and synthesis of sister chromatids
Describes what phase of the cell cycle?
S Phase
Post-DNA replication growth and preparation for mitosis
Describes what phase of the cell cycle?
G2 Phase
Cell division and separation of chromosomes
Describes what phase of the cell cycle?
M Phase
Quiescent phase; non-dividing state
Describes what phase of the cell cycle?
G0 Phase
Which of the cell cycle checkpoints is MOST critical in ensuring that damaged DNA is not passed on to daughter cells?
G2 Checkpoint
Where does DNA replication primarily occurs?
The S phase
A client asks the nurse about factors that can initiate cancer development. Which of the following factors should the nurse identify as potential initiators of cellular mutations? (Select all that apply.)
A. High-fiber diet
B. Exposure to radiation
C. Infection with certain viruses
D. Regular exercise
E. Genetic predisposition
B, C, & E
* Radiation (B) and certain viruses (C) can directly damage DNA and initiate mutations. Genetic predisposition (E) refers to inherited mutations that increase cancer susceptibility. A high-fiber diet (A) and regular exercise (D) are generally considered protective against cancer.
What happens to a cell during each stage of cancer?
Initiation: A normal cell experiences DNA damage or mutation.
Promotion: Altered cells are stimulated to proliferate.
Progression: Cancer cells spread to distant sites.
Describe the general characteristic of bengin cells.
Encapsulated: Usually
Differentiated: Normally
Metastasis: Absent
Recurrence: Rare
Vascularity: Slight
Mode of growth: Expansive
Cell characteristics: Fairly normal, like parent cells
Table 16.3, pg. 271
Protective sac (encapsulated)
Slow growing
Locoalized
Non invasive
Describe the general characteristic of malignant cells.
Encapsulated: Rarely
Differentiated: Poorly
Metastasis: Capable
Recurrence: Possible
Vascularity: Moderate to marked
Mode of growth: Infiltrative & expansive
Cell characteristics: Cells abnormal, become more unlike parent cells
Table 16.3, pg. 271
No sac (non-capsulated)
Fast growing
Invasive & infiltrates
Matastasize
What are the main sites of metastasis?
5
- Brain & cerebrospinal fluid
- Lung
- Liver
- Adrenals
- Bone