Anti-neoplastic Agents Flashcards
Cancer (Malignant neoplasia) Defined (3)
Uncontrolled growth and spread of abnormal cells
Tumors may be benign or malignant (cancer)
In cancer, cell proliferation (cell renewal and replacement (becomes unbalanced)
Goal of cancer treatment (2)
- Total cell kill
2. To kill cancer without destroying normal cells
First order kinetics: Fractional Cell Kill (2)
Cancer drugs kill a fixed percentage (proportion) of tumor cells and not a fixed number of cells
This means that the same dose which decreases tumor burden from 10^6 to 10^3 cells will be needed to decrease the burden from 10^3 to 10^0 cells
Log-cell kill hypothesis (3)
Magnitude of a tumor cell kill is a logarithmic function
A dose of an effective drug will reduce the cancer cell load from trillion cells to billion cells: 3-log-kill
One of the reason for use of drug combination
Generation Time
Time to complete one cycle
Growth Fraction
% of cell which are actively dividing
2 Types of Drugs Against Cancer `
- Cell-cycle specific
2. Cell-cycle non specific
Cell-Cycle Specific (CCS) Drugs (2)
Acts on cell undergoing division
In general, CCS drugs are MOST effective in high growth fraction tumors
Cell-Cycle Non Specific Drugs (2)
Acts on cell during any phase
Useful in LOW growth fraction sold tumors as well as high growth fraction tumors
Cell Cycle: 1 - Non phase specific (5)
- Alkylating agents
- Nitrosourea
- Dacarbazine
- Cisplatin
- Antitumor antibiotics
Cell Cycle: 2. Phase specific (CCS) - a: G1 phase defined and drugs (2)
Synthesis of cells components needed for DNA synthesis
L-asparaginase
Mitomycin
Cell Cycle: 2. Phase specific (CCS) - b: S-phase (7)
Period of DNA synthesis
- Cytarabine
- 6-mercaptopurine (6MP)
- 6-thioguanine (6TG)
- Methotreaxate (MTX)
- Hydroxyurea
- Etoposide
Cell Cycle: 2. Phase specific (CCS) - c: G2 phase (2)
Preparation for mitosis
Bleomycin
Cell Cycle: 2. Phase specific (CCS) - d: M phase (4)
Mitosis
- Vinblastine
- Vincristin
- Paclitaxel
Cell Cycle: 1 - Non phase specific: Alkylating Agents (6)
- Cyclophosphamide
- Ifosfamide
- Mechrorethamine
- Melphalan
- Chlorambucil
- Busulphan