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Chemotherapy – How It Works, Process and Side Effects

Chemotherapy is a drug-based cancer treatment that kills tumor cells or stops their growth. It is used alone or in combination with other therapies.

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Things worth knowing about "Chemotherapy"

Chemotherapy is a drug-based cancer treatment that kills tumor cells or stops their growth. It is used alone or in combination with other therapies.

What is Chemotherapy?

Chemotherapy is one of the most important treatment methods for cancer. It uses special medications called cytostatics (also known as cytotoxic drugs) to kill cancer cells or prevent them from dividing uncontrollably. These drugs are most commonly administered intravenously but can also be taken orally as tablets or capsules. Because the medication travels through the bloodstream and reaches the entire body, chemotherapy is particularly effective for treating cancers that have spread to other parts of the body (metastases).

When is Chemotherapy Used?

Chemotherapy is applied in several different clinical situations:

Curative chemotherapy: Aimed at completely eliminating the cancer and achieving a cure.
Neoadjuvant chemotherapy: Given before surgery to shrink the tumor, making it easier to remove.
Adjuvant chemotherapy: Administered after surgery to destroy any remaining cancer cells and reduce the risk of relapse.
Palliative chemotherapy: Not intended to cure, but to relieve symptoms and improve quality of life in advanced cancer.

Mechanism of Action

Cytostatic drugs interfere with the cell cycle – the natural process by which cells grow and divide. They damage the DNA of cancer cells or block enzymes essential for cell division. Since cancer cells divide more rapidly than most healthy cells, they are particularly vulnerable to these drugs. However, healthy fast-dividing cells – such as those in hair follicles, the lining of the digestive tract, and the bone marrow – are also affected, which accounts for the typical side effects.

Key Drug Classes

Alkylating agents (e.g., cyclophosphamide): Cross-link DNA strands, preventing replication.
Antimetabolites (e.g., 5-fluorouracil): Inhibit the synthesis of DNA and RNA building blocks.
Topoisomerase inhibitors (e.g., doxorubicin): Block enzymes needed for DNA repair and replication.
Taxanes (e.g., paclitaxel): Prevent cell division by stabilizing the cellular skeleton.
Vinca alkaloids (e.g., vincristine): Destroy the spindle apparatus required for chromosome separation.

How Chemotherapy is Administered

Chemotherapy is typically delivered in cycles, meaning treatment phases alternate with rest periods to allow the body to recover from side effects. A single cycle usually lasts two to four weeks, and multiple cycles are administered in sequence. Treatment may take place on an outpatient basis or during a hospital stay, depending on the drugs used and the condition of the patient.

Side Effects

Because cytostatic drugs do not exclusively target cancer cells, significant side effects can occur. The most common include:

Nausea and vomiting
Hair loss (alopecia)
Fatigue and exhaustion (cancer-related fatigue)
Increased susceptibility to infections due to bone marrow suppression (leukopenia)
Mucositis – inflammation of the mouth and gastrointestinal lining
Increased bleeding risk due to reduced platelet count (thrombocytopenia)
Anemia (low red blood cell count)
Nerve damage (peripheral neuropathy)

Many of these side effects are temporary and resolve after treatment ends. Modern supportive medications – such as antiemetics to prevent nausea – can greatly improve tolerability and quality of life during treatment.

Combination with Other Therapies

Chemotherapy is frequently combined with other cancer treatments to enhance effectiveness:

Radiation therapy (chemoradiation)
Surgical procedures
Immunotherapy (e.g., checkpoint inhibitors)
Targeted therapy
Hormone therapy

Diagnosis and Treatment Planning

Before starting chemotherapy, a thorough diagnostic workup is performed, including blood tests, biopsy, and imaging studies such as CT or MRI scans. Based on these results, an individualized treatment plan is created, taking into account the type and stage of the cancer as well as the overall health of the patient. Regular follow-up examinations are conducted throughout treatment to assess the response to therapy and detect side effects early.

References

World Health Organization (WHO) (2022): Cancer – Key Facts. www.who.int/news-room/fact-sheets/detail/cancer
National Cancer Institute (NCI) (2023): Chemotherapy to Treat Cancer. www.cancer.gov/about-cancer/treatment/types/chemotherapy
DeVita V.T., Lawrence T.S., Rosenberg S.A. (2019): DeVita, Hellman, and Rosenberg's Cancer: Principles and Practice of Oncology. 11th Edition, Wolters Kluwer.

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