Multimodal Therapy

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Multimodal therapy combines more than one method of cancer treatment. Surgery with chemotherapy and radiation therapy is a common treatment approach for mesothelioma. Experimental treatments, such as immunotherapy and gene therapy, can also be added to the mix.

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Dr. David Sugarbaker, leading mesothelioma expert, explains the importance of multimodal therapy for treating mesothelioma.
Dr. David Sugarbaker, leading mesothelioma expert, explains the importance of multimodal therapy for treating mesothelioma.

What Is Multimodal Therapy for Mesothelioma?

Multimodal therapy combines mesothelioma treatments to attack the cancer from multiple angles. One treatment alone cannot control the cancer, but combining treatments offers patients a better chance at living longer.

Doctors sometimes use a more specific term for a multimodal treatment plan. “Bimodal therapy” combines two treatments, and “trimodal therapy” combines three treatments.

A multimodal treatment approach usually centers on a major tumor-removing surgery with chemotherapy and radiation therapy administered before, after or during the surgery.

  • For peritoneal mesothelioma, cytoreductive abdominal surgery combined with hyperthermic intraperitoneal chemotherapy (HIPEC) is the most effective treatment approach.
  • For pleural mesothelioma, there is no single treatment plan that is clearly better than all the others. It depends on the patient’s specific circumstances and the judgement of their doctors.
Dr. Fontaine goes over multimodal treatment, an aggressive treatment strategy.

Who Is Eligible for Multimodal Treatment?

Patients diagnosed at an early stage who are otherwise in good health are ideal candidates for multimodal therapy.

Stage

The stage of mesothelioma refers to how far the cancer has advanced and spread. Early-stage cancer is small and localized, making it easier to surgically remove and easier to treat with other therapies.

Late-stage cancer, however, may already be so widespread that trying to completely remove it would do more harm than good to the patient. For late-stage patients, doctors usually recommend less invasive palliative treatments that focus on easing symptoms.

Cell Type

The cell type of a mesothelioma tumor affects how well it responds to treatment. Epithelioid tumors are easier to remove in surgery and more responsive to chemotherapy. Patients with this type of mesothelioma have a greater chance to benefit from multimodal treatment.

Overall Health

Many patients are not eligible for aggressive treatment because of health reasons.

Health Factors That Determine Eligibility

  • Surgeons must ensure the patient’s body is strong enough to heal from a major surgical procedure.
  • Oncologists must analyze the patient’s body chemistry to make sure chemotherapy will not be too toxic.
  • Radiologists must check whether the patient has reached the limit for how much radiation they can safely receive.

The high cost of cancer treatments also puts mesothelioma multimodal therapy beyond the reach of many patients.

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Multimodal Treatment Strategies

The treatments used in multimodal therapy fall into three categories. The difference is in the timing of each treatment relative to the others.

Neoadjuvant Therapy

This is given in the weeks or months before primary therapy. In certain cases, doctors administer chemotherapy before surgery to reduce the size of tumors. This increases the chance of complete removal during surgery.

Primary Therapy

This is the most potentially effective treatment option. For mesothelioma patients who qualify, this usually means surgery. Surgeons may administer targeted treatments such as intraoperative chemotherapy or photodynamic therapy immediately after tumor removal, before the surgery is finished.

Adjuvant Therapy

This is given in the weeks or months after primary therapy. It is common for doctors to administer chemotherapy after surgery to kill any cancer cells remaining in the body. Sometimes doctors also try to prevent local cancer recurrence with radiation therapy. They irradiate the empty space left behind by a removed lung, or they direct small doses of radiation along surgical incision sites.

A 2016 review of 1,625 mesothelioma patients shows only a small proportion received more than one type of treatment
Treatment Type Percentage
Chemotherapy or Surgery 44%
Chemotherapy and Surgery 15%
Neither Treatment 41%

Choosing the Right Treatments

Doctors are still experimenting to find the most effective combination of therapies for pleural mesothelioma treatment. Most specialists recommend a three-pronged approach that combines surgery with adjuvant chemotherapy and radiation therapy.

When developing a multimodal treatment strategy, a team of doctors evaluates each case individually. They weigh the risks and benefits of potential treatments based on the patient’s unique situation. The team recommends the combination of treatments that offers the most hopeful outlook.

If the patient responds poorly — or especially well — to any one treatment, the team can adjust the treatment plan moving forward. They may add a more promising treatment option, replace an ineffective one or adjust the dosage of an existing one.

Quick Fact:

With surgery alone, it is nearly impossible for doctors to remove all tumors and prevent them from returning later on. To boost results, they can provide chemotherapy or radiation therapy before or after surgery.

Multimodal Therapy Breakthroughs for Mesothelioma

In recent years, mesothelioma specialists have started combining traditional therapies with experimental treatments. New technologies include immunotherapy, gene therapy and photodynamic therapy. For now, novel treatments such as these are only available to patients participating in a clinical trial or through compassionate use programs.

Photodynamic Therapy Study Extended Survival for Years

A 2017 study published in the Annals of Thoracic Surgery looked at pleural mesothelioma patients treated with a combination of surgery, chemotherapy and photodynamic therapy. The patients had a median survival time of three years, and 19 of the 73 patients in the study lived more than seven years.

The Abramson Cancer Center of the University of Pennsylvania has sponsored an ongoing phase 2 clinical trial of this novel multimodal approach since 2014.

A 2017 study of 73 epithelioid patients also linked a multimodal approach with photodynamic therapy to long median survival times.

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Keytruda Shows Promising Results

The immunotherapy drug pembrolizumab has shown effectiveness with mesothelioma patients in clinical trials. Merck & Co. markets it under the brand name Keytruda.

Keytruda shrunk tumors in more than half of the patients in a mesothelioma clinical trial. All the patients had previously received chemotherapy.

In 2016, a phase I clinical trial began to test pembrolizumab in a multimodal approach as both a neoadjuvant treatment and an adjuvant treatment. Doctors are combining it with lung-sparring surgery and standard chemotherapy.

Anti-Angiogenesis Prolongs Survival

In 2017, French researchers announced results from their multimodal study combining chemotherapy with the anti-angiogenesis drug bevacizumab (Avastin). They reported a three-month improvement in median overall survival and progression-free survival among patients who received both therapies.

The results were so positive that French oncologists added Avastin to their standard of care for pleural mesothelioma patients who do not qualify for surgery. In the U.S., the National Comprehensive Cancer Network changed its recommendation for first-line pleural mesothelioma treatment to include Avastin.

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Registered Nurse and Patient Advocate

Karen Selby joined Asbestos.com in 2009. She is a registered nurse with a background in oncology and thoracic surgery and was the regional director of a tissue bank before becoming a Patient Advocate at The Mesothelioma Center. Karen has assisted surgeons with thoracic surgeries such as lung resections, lung transplants, pneumonectomies, pleurectomies and wedge resections. She is also a member of the Academy of Oncology Nurse & Patient Navigators.

Walter Pacheco, Managing Editor at Asbestos.com
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Last Modified September 26, 2019

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