Head and Neck Cancer Treatment: An Overview of Key Therapies

An Introduction to Head and Neck Cancer Treatment

The term “head and neck cancer” encompasses a diverse group of cancers that can occur in various locations, including the mouth (oral cavity), throat (pharynx), voice box (larynx), sinuses, and salivary glands. The treatment of these cancers is exceptionally complex due to the vital functions of this region, such as breathing, speaking, and swallowing. The primary goals of treatment are not only to cure the cancer but also to preserve these critical functions and maintain the patient’s quality of life.

The treatment strategy is highly individualized and depends on a number of crucial factors. These include the precise location of the tumor, its stage (size and extent of spread), its specific cell type, and, increasingly, its status related to the human papillomavirus (HPV). For localized disease, the goal is curative, often requiring an intensive, multi-modal approach. For disease that has spread to distant parts of the body, treatment focuses on control and symptom management.

The Critical Role of the Multidisciplinary Team (MDT)

Effective management of head and neck cancer requires the close collaboration of a dedicated multidisciplinary team. Given the potential for treatment to impact appearance, speech, and swallowing, this team-based approach is essential to develop a comprehensive plan that addresses all aspects of a patient’s well-being.

The core members of a head and neck cancer MDT include:

• Head and Neck Surgeon (Otolaryngologist or ENT): A surgeon who specializes in the complex anatomy of the head and neck and performs biopsies, tumor resections, and neck dissections.
• Radiation Oncologist: A physician who specializes in planning and delivering radiation therapy, a cornerstone of treatment for many head and neck cancers.
• Medical Oncologist: A physician who manages systemic therapies like chemotherapy, targeted therapy, and immunotherapy.
• Speech-Language Pathologist (SLP): A crucial team member who evaluates and treats issues with speech, voice, and swallowing, both before and after treatment.
• Registered Dietitian: A nutrition expert who helps patients manage their nutritional needs, which is often a major challenge during treatment.
• Dentist or Oral Surgeon: A specialist who performs a pre-treatment dental evaluation to address any potential issues that could be complicated by radiation therapy.
• Reconstructive Surgeon: A surgeon who may be involved in rebuilding tissues after a major tumor resection.

Key Factors Guiding Treatment

The treatment plan is primarily guided by the tumor’s location and, for throat cancers, its HPV status.

• Tumor Location: Treatment can vary significantly based on where the cancer is located. For example, an early-stage cancer in the oral cavity is often treated with surgery first, whereas a similar-stage cancer in the larynx might be treated with radiation to preserve the voice.
• HPV Status: A growing number of cancers of the oropharynx (the middle part of the throat, including the tonsils and base of the tongue) are caused by HPV. HPV-positive cancers have a distinct biology, respond differently to treatment, and often have a significantly better prognosis than HPV-negative cancers. This information can influence treatment decisions, and clinical trials are actively investigating whether less intensive therapy can be used for this group.

Primary Treatment Modalities

Treatment for head and neck cancer often involves a combination of surgery, radiation, and chemotherapy.

Surgery

Surgery is a primary treatment for many head and neck cancers, particularly those in the oral cavity. The main goals are to completely remove the tumor and to assess and remove any lymph nodes in the neck that may contain cancer.

• Tumor Resection: The surgical removal of the primary tumor. The extent of the resection depends on the tumor’s size and location.
• Neck Dissection: A procedure to remove lymph nodes from the neck. This is done because head and neck cancers commonly spread to these nodes. A pathologist examines the removed nodes to help accurately stage the cancer, which guides decisions about whether further treatment (like radiation) is needed.
• Reconstructive Surgery: Following the removal of a large tumor, reconstructive surgery may be necessary to restore appearance and function. This can involve moving tissue from another part of the body (a “flap”) to rebuild parts of the jaw, tongue, or throat.

Radiation Therapy

Radiation therapy is a central component of treatment for a majority of patients. It uses high-energy beams to destroy cancer cells.

• As a Primary Treatment: For many cancers of the larynx and pharynx, radiation is used as the main treatment (often combined with chemotherapy) with the goal of curing the cancer while preserving the organ and its function (e.g., preserving the voice).
• As Adjuvant Therapy: Radiation is frequently given after surgery to destroy any microscopic cancer cells that may have been left behind, reducing the risk of a local recurrence.
• Intensity-Modulated Radiation Therapy (IMRT): This is the standard radiation technique for head and neck cancer. It is an advanced form of radiation that uses sophisticated computer planning to sculpt the radiation beams to the precise shape of the tumor. This allows for a high dose to be delivered to the cancer while minimizing the dose to nearby healthy structures, such as the salivary glands and spinal cord, thereby reducing side effects.

Systemic Therapies

• Chemotherapy: For head and neck cancer, chemotherapy is rarely used as a standalone curative treatment. Instead, it is used in several ways:
  1. Concurrent with Radiation: The most common use is as a “radiosensitizer,” given at a low dose during the course of radiation therapy. The chemotherapy makes the cancer cells more vulnerable to being killed by the radiation.
  2. For Advanced/Metastatic Disease: In higher doses, chemotherapy is a primary treatment to control cancer that has spread to distant parts of the body.
• Targeted Therapy: For some advanced head and neck cancers, a targeted drug that blocks a protein called EGFR (epidermal growth factor receptor), which helps cancer cells grow, may be used.
• Immunotherapy: Immune checkpoint inhibitors, drugs that help the body’s own immune system fight cancer, have become a standard treatment for patients with recurrent or metastatic head and neck cancer.

The Vital Role of Supportive Care

Managing the side effects of treatment is as important as the treatment itself. Supportive care is essential to help patients get through therapy and to optimize their long-term functional outcomes.

• Speech and Swallowing Therapy: Radiation and surgery can cause scarring and stiffness that severely impact swallowing. A speech-language pathologist works with patients before treatment begins, teaching them exercises to maintain muscle function and flexibility. They continue to work with patients throughout and after treatment to help them regain the ability to eat and speak as normally as possible.
• Nutritional Support: Most patients undergoing chemoradiation for head and neck cancer will experience significant pain, mouth sores, and difficulty swallowing, making it impossible to eat enough to maintain their weight. To prevent malnutrition and treatment interruptions, a feeding tube is often proactively placed before treatment starts. The most common type is a percutaneous endoscopic gastrostomy (PEG) tube, which is inserted through the skin of the abdomen directly into the stomach.
• Dental Care: Radiation to the head and neck can damage the salivary glands (causing permanent dry mouth) and reduce the blood supply to the jawbone. This increases the risk of severe dental decay and a serious complication called osteoradionecrosis (bone death). It is mandatory for patients to have a full dental evaluation before radiation begins so that any necessary tooth extractions or dental work can be completed beforehand.

Frequently Asked Questions

1. How does HPV status affect treatment for throat cancer?
Cancers of the oropharynx (throat) that are caused by HPV have a different biological profile and are generally much more responsive to treatment with radiation and chemotherapy. Because these cancers have a better prognosis, clinical trials are investigating whether treatment can be “de-intensified” for HPV-positive patients to reduce long-term side effects while maintaining high cure rates.

2. What is the purpose of a neck dissection?
A neck dissection is a surgical procedure to remove the lymph nodes from one or both sides of the neck. It is done for two main reasons: first, to remove lymph nodes that are known or suspected to contain cancer, and second, to provide accurate staging by allowing a pathologist to determine how far the cancer has spread, which is critical for planning post-operative treatment.

3. Why is radiation often combined with chemotherapy?
When used together (a regimen called chemoradiation), the chemotherapy is typically given at a low dose and acts as a “radiosensitizer.” This means it makes the cancer cells more sensitive to the effects of the radiation, enhancing the treatment’s ability to kill cancer cells compared to using radiation alone.

4. What is IMRT and why is it important?
IMRT, or Intensity-Modulated Radiation Therapy, is an advanced radiation technique that uses computer-guided beams that can be precisely shaped. This allows the radiation oncologist to deliver a high, curative dose of radiation to the tumor while minimizing the dose to nearby critical structures like the salivary glands, spinal cord, and jawbone. This helps to reduce side effects like permanent dry mouth.

5. Why is a feeding tube often necessary during treatment?
Treatment for head and neck cancer, particularly chemoradiation, causes severe side effects like mouth sores, throat pain, and difficulty swallowing. This makes it nearly impossible for most patients to eat and drink enough to maintain their weight and nutrition. A feeding tube (like a PEG tube) is often placed before treatment begins to provide a reliable way to get nutrition, which helps patients tolerate the full course of therapy.

6. What is the role of a speech-language pathologist (SLP)?
The SLP plays a crucial role in helping patients maintain function. Before treatment, they assess a patient’s baseline swallowing and speech and provide exercises to keep the muscles strong and flexible. During and after treatment, they work with patients to manage swallowing difficulties, adapt to changes, and regain the ability to eat safely and communicate effectively.

7. Why must I see a dentist before starting radiation?
Radiation therapy to the head and neck can cause permanent damage to the jawbone’s blood supply. If a tooth needs to be extracted after radiation, the bone may not be able to heal properly, leading to a severe and painful complication called osteoradionecrosis. A pre-treatment dental evaluation is essential to identify and remove any unhealthy teeth beforehand to prevent this complication.