Chemotherapy is a systemic cancer treatment that uses powerful drugs to destroy or slow the growth of rapidly dividing cancer cells. It circulates throughout the body via the bloodstream, making it effective for cancers that have spread (metastasized).
How Chemotherapy Works
- Targets fast-dividing cells (a key trait of cancer).
- Damages DNA or disrupts cell division to stop tumor growth.
- Affects some healthy cells (like hair follicles, digestive lining), causing side effects.
Common Uses of Chemotherapy
✔ Primary Treatment: For cancers highly sensitive to drugs (e.g., leukemia, lymphoma).
✔ Adjuvant Therapy: Kills residual cells after surgery/radiation.
✔ Neoadjuvant Therapy: Shrinks tumors before surgery (e.g., breast cancer).
✔ Palliative Care: Eases symptoms in advanced cancer.
Types of Chemotherapy Drugs
| Category | Example Drugs | How They Work |
|---|---|---|
| Alkylating Agents | Cyclophosphamide | Damage the DNA to prevent replication |
| Antimetabolites | 5-Fluorouracil (5-FU) | Mimic nutrients to starve cells |
| Plant Alkaloids | Paclitaxel (Taxol) | Block cell division |
| Targeted Therapy | Trastuzumab (Herceptin) | Attack specific cancer markers |
Typical Treatment Plan
- Cycles: Drugs given in intervals (e.g., 3 weeks on, 1 week off) to let healthy cells recover.
- Delivery Methods:
- IV infusion (most common)
- Oral pills (e.g., capecitabine)
- Injections (into muscle/spine)
Potential Side Effects
Common:
- Fatigue, nausea, hair loss
- Low blood counts (risk of infection/anemia)
- Mouth sores, appetite changes
Long-term:
- Nerve damage (peripheral neuropathy)
- Heart or lung issues (with certain drugs)
Management: Anti-nausea meds, growth factor injections, cooling caps for hair preservation.
Advances in Chemotherapy
- Personalized Medicine: Genetic testing to match effective drugs.
- Liposomal Delivery: Encapsulated drugs reduce side effects.
- Immunotherapy Combos: Enhances immune response against cancer.
Frequently Asked Questions
Q: Does chemo always cause hair loss?
A: No—depends on the drug (e.g., taxanes often do; targeted therapies usually don’t).
Q: Can I work during treatment?
A: Many do, but fatigue may require adjustments.
Q: How is chemo different from radiation?
A: Radiation is localized; chemo is whole-body.
