Transcript 1.5.3 Cancer

Cancer

Catalyst
 What
is the purpose behind mitosis?
 Fill in the blanks: In mitosis, _____cells divide ___
time(s) to produce ___ new cells that are __________.
 What is cancer?
 How do people get cancer?
 Why is cancer harmful?
Write in complete sentences!
Don’t talk during the Catalyst!
Objectives
By the end of today, SWBAT…
 Describe the causes, symptoms,
and treatments of cancer
Agenda

Cancer
Causes
Symptoms
Treatment
Game: Rally-Coach
 National Cancer Institute reading
 Exit Question

What is cancer?

Key Point #1: Cancer is a disease of mitosis that
causes uncontrolled cell growth
 Cells
divide over and over without stopping
 Produces a mass of cells called tumors
Not all tumors are cancerous
Not all tumors are caused by cancer
 Benign tumors are NOT cancerous

Do

not spread, usually harmless
Malignant tumors ARE cancerous
Grow
rapidly, spread through the body
and invade normal tissue
How does cancer kill?

Key Point #2: Cancer cells steal nutrients from
normal cells, and may stop organs from
functioning
 Steal
food from other cells, starving them
 Tumors press on organs
 Cancerous organs do not do their job properly
How is cancer caused?

Key Point #3: Cancer can be genetic, or
caused by exposure to chemicals,
viruses, or other factors
 Genetic:
DNA has a mutation (mistake)
 Chemicals: smoke, alcohol, deep fried foods,
etc.
 Viruses: HPV (cervical cancer), Hepatitis B
(liver cancer), HIV (skin cancer)
 Other factors: Sunlight, old age
How do we treat cancer?

Key Point #4: The three most common
treatments for cancer are radiation therapy,
chemotherapy, and surgery
 Radiation
 Radiation
therapy = use radiation to kill cancer cells
kills all cells… including normal ones!
How do we treat cancer?

Key Point #4: The three most common treatments
for cancer are radiation therapy, chemotherapy,
and surgery
 Chemotherapy
 But
= chemicals kill rapidly growing cells
some rapidly growing cells aren’t cancerous!
How do we treat cancer?

Key Point #4: The three most common treatments
for cancer are radiation therapy, chemotherapy,
and surgery
 Surgery
 If
= cut out the cancerous cells
the cancer has already spread throughout the body, you can’t
cut it out from everywhere
Rally-Coach

Work in partners
2
sets of questions: A and B
 Alternate reading and answering questions with your
partner


COACH each other on the answers—don’t just give
them away if your partner doesn’t know them
If your partner gets the question wrong, ask them
again at the end
Homework
Key Point Wrap-Up




Key Point #1: Cancer is a disease of mitosis that
causes uncontrolled cell growth
Key Point #2: Cancer cells steal nutrients from
normal cells, and may stop organs from
functioning
Key Point #3: Cancer can be genetic, or caused by
exposure to chemicals or viruses
Key Point #4: The three most common treatments
for cancer are radiation therapy, chemotherapy,
and surgery
Exit Questions
How are mitosis and cancer related?
 Describe two causes of cancer
 Describe one way that cancer can kill its
host
 Which treatment for cancer do you think
is most effective? Why?

Write in complete sentences!
Don’t talk during the Exit Question!