Cancer Pharmocology - Dr. Kruse Flashcards
p-Glycoprotein (PGP) (MDR1)
linked to resistance if a cell type has this expressed
- primary or natural resistance if expressed
- acquired resistance if overexpressed
tumor supressors act on
G2
oncogenes act on
G1
as tumor spreads more reason its harder to cure
it takes up more of the organs
it slows its division rate because there are less BVs available to take over for nutrients
= chemotherapy drugs cant effectively target the cancer calls now since they arent as fast replicating
how to over come the BBB
intrathecal, intracavity, intra….
IMPLANTABLE WAFER coated with Carmustine = radiation constant in high grade malignant glioma
Alkalizing drugs can be toxic and cause what new cancers
ALL and AML
chemotherapy usually caues what common side effects
hair loss oral mucosa destruction sperm forming cell destruction GI cell destruction BM destruction
Hematopoietic agents
prevents or decreases the neutropenia, thrombocytopenia, and anemia
Seratonin receptor agonist
prevents or decreases the Nausea Vomiting (Zophran)
also called Ondansetron
Bioohosphates
delay skeletal complications
Akylating agents do what
bind to DNA esp Guanines and cause cross linking between then to prevent DNA uncoiling = no DNA replication or check points
Cyclophosphamide side effects and what class of drugs
most used akylating agent and causes the most N/V
** Hemorrhagic cystits** = from Acrolein side product
Akylating agents include what 6 drugs and cell cycle
- Cyclophosphamide
- Carmustine
- Busulfan
- Procarbazine
- Dacarbazine
- Cisplatin
Cell cycle : nonspecific
How to activate Cyclophosphamide
CYP450 2B
this makes Acrolein + Phosphate mustard
how to elliminate Side effects of cyclophosphamide
MESNA : inhibits Acrolein to avoid hemorrhagic cystitis
SERATONIN : to prevent N/V
Cisplatin side effect
renal tubular damage, ototoxicity
Busulfan side effects
pulmonary fibrosis
Antimetabolites do what
block metabolited for DNA replication
- effects S phase
Antimetabolites 3 drugs and cell cycle
- Folic acid analog : methotraxate + Leucovorin
- Pyrimidine analog : 5-fluorouracil
- Purine analog : 6- mercaptopurine (6-MP)
Cell cycle : S-phase specific
Methotrexate needs what and for what reason
- low dose Leucovorin rescue
= rescues the normal cells that absorb it at low levels (not cancer cells that dont absorb anything at low levels
= high dose methotrexate (cancer cells absorb it even the more resistant ones, so they die)
Methotrexate side effects
mucosal ulceration
Methotrexate does what MOA
Blocks dihydrofolate reductase = no dTMP —-> dTTP made
what does leucovorin do specifically
gives N5N10 methylene FH4 that allows call to still make dTMP —-> dTTP
Methotrexate is used for what
psoriasis - immune supressor
RA - immune supressor
Cancer treatment
Fluorouracil is what active compund and what is the MOA
FdUMP = active compound
it binds to thymidylate synthase and blocks dTMP being made which later becomes dTTP
Fluorouracil does what to DNA
alters the Uracil and how it is made
Mercaptopurine (6-MP) active form and metabolized form
HGPRT : makes monophosphate nucleotide 6-thioinsinic acid
Xanthinie oxidase : makes 6-thiouric acid
Mercaptopurine (6-MP) used for what and side effect
acute leukemias
Tumor Lysis Syndrome causing hyperuricemia
Drug to prevent Mercaptopurine (6-MP) side effects
Allopurinol : inhibits xanthine oxidase
** can cause build up of 6-Thiouric acid toxic so must be given with small amounts of 6MP to control this**
allopurinol tx what
gout
toxic lysis syndrome hyperuricemia