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Neoadjuvant Therapy – Definition & Uses

Neoadjuvant therapy is a treatment given before the main procedure – usually surgery – to shrink a tumor, improve operability, and increase the chances of a successful outcome.

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Things worth knowing about "Neoadjuvant Therapy"

Neoadjuvant therapy is a treatment given before the main procedure – usually surgery – to shrink a tumor, improve operability, and increase the chances of a successful outcome.

What is Neoadjuvant Therapy?

Neoadjuvant therapy refers to medical treatment administered before the primary procedure – most commonly before surgery. The main goal is to shrink a tumor prior to its surgical removal, reduce the spread of cancer, and improve the likelihood of a complete resection. The term combines the Latin prefix “neo” (new, before) with “adjuvant” (assisting). In contrast, treatment given after surgery is referred to as adjuvant therapy.

Indications and Areas of Use

Neoadjuvant therapy is used in various cancer types where immediate surgery may not be feasible or would not yield the best outcome. Common applications include:

Breast cancer: Frequently used to shrink tumors before surgery, enabling breast-conserving procedures.
Rectal cancer: A combination of radiation and chemotherapy is used to reduce tumor size before bowel surgery.
Esophageal cancer: Chemotherapy or chemoradiation is administered to improve resectability.
Stomach cancer: Perioperative chemotherapy is a key component of the treatment plan.
Lung cancer: Applied in specific stages of non-small cell lung cancer (NSCLC).
Bladder cancer, cervical cancer, and other tumor types: Depending on the stage and extent of disease.

Types of Neoadjuvant Treatment

Neoadjuvant therapy may involve several treatment modalities:

Neoadjuvant Chemotherapy

Neoadjuvant chemotherapy uses cytotoxic drugs (cytostatics) that kill cancer cells or inhibit their growth. It is administered over several cycles before the surgical procedure takes place.

Neoadjuvant Radiotherapy

Neoadjuvant radiotherapy uses ionizing radiation to target and shrink the tumor locally. It is often combined with chemotherapy (chemoradiation) to achieve a synergistic effect.

Neoadjuvant Immunotherapy and Targeted Therapy

Modern approaches also include checkpoint inhibitors (immunotherapy) and targeted agents such as tyrosine kinase inhibitors or monoclonal antibodies, which act on specific molecular characteristics of tumor cells.

Goals of Neoadjuvant Therapy

Neoadjuvant therapy pursues several key clinical objectives:

Tumor downsizing (downstaging): Reducing the size and stage of the tumor to facilitate or enable surgery.
Improving resectability: Making tumors that are initially inoperable amenable to surgical removal.
Organ preservation: For example, in breast cancer, tumor shrinkage may allow for breast-conserving surgery instead of mastectomy.
Elimination of micrometastases: Early treatment of small, undetectable secondary tumors that may already be present at the time of diagnosis.
Assessing treatment response: The response of the tumor to therapy provides valuable information about treatment effectiveness and guides further planning.

Pathological Response

After surgery, the removed tumor tissue is examined under the microscope (histopathological analysis). This assessment determines how well the tumor responded to neoadjuvant therapy. A pathological complete response (pCR) – meaning no residual tumor tissue is found in the surgical specimen – is considered a positive prognostic factor and is associated with improved survival rates in many tumor types.

Side Effects

Like all cancer treatments, neoadjuvant therapy can cause side effects. These vary depending on the type of treatment used and may include:

Fatigue and exhaustion
Nausea, vomiting, and diarrhea
Changes in blood counts (e.g., anemia, increased susceptibility to infection)
Skin reactions from radiotherapy
Nerve pain (neuropathy) from certain chemotherapy agents
Cardiac complications from certain targeted therapies

Side effects are closely monitored by the medical team and managed as needed throughout the course of treatment.

Benefits and Limitations

In appropriate cases, neoadjuvant therapy offers clear advantages over immediate surgery: improved operability, organ preservation, and early treatment of micrometastases. However, it is not suitable for all patients or all tumor types. In cases where a tumor is already well-operable or growing very rapidly, direct surgery may be the preferred approach. Treatment decisions are made individually within an interdisciplinary tumor board, taking all relevant clinical factors into account.

References

National Comprehensive Cancer Network (NCCN): NCCN Clinical Practice Guidelines in Oncology – Breast Cancer, Rectal Cancer, Gastric Cancer (current versions). Available at: www.nccn.org
Lordick F. et al.: Neoadjuvant and perioperative treatment concepts in gastric cancer. The Oncologist, Oxford University Press (2021).
World Health Organization (WHO): Cancer – Diagnosis and Treatment Overview. Available at: www.who.int/health-topics/cancer

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