Interventional Radiology Treatments for Lung Cancer
Minimally Invasive Treatments Help Cancer Patients Extend Life and Improve Quality of Life
Normally, cells grow and divide to form new cells as the body needs them. When cells grow old, they die and new cells take their place. Sometimes this orderly process goes awry--that is, new cells form when the body does not need them, and old cells do not die when they should. These extra cells can form a mass of tissue, or tumor. Cancerous tumors are abnormal and divide without control or order.
The lung is the most common site for primary cancer worldwide, and smoking tobacco is the leading risk factor. The lung is also a common site of metastases for various malignancies. Metastases occur when a single tumor cell or clump of cells gain access to the blood stream or lymphatic system, travel to a new organ (such as the lung) begin to multiply and then regrow their vascular structure to obtain food.
Interventional radiologists can deliver direct treatments to lung cancer without significant side effects or damage to nearby normal tissue. There are two main methods by which interventional radiologists can treat cancer. The first is to use the vascular system to deliver chemotherapy medicine directly to the cancer's vascular supply. This limits damage and toxicity to the rest of the body while delivering the highest dose of the chemotherapy to the cancer. The second method interventional radiologists use to treat cancer is to "cook" or "freeze" the cancer by sticking a small, energy-delivering needle directly into the cancer that heats or freezes the cancer without significant damage to nearby normal tissue. Since these techniques are delivered at the cancer specifically, patients have fewer overall side effects making this especially useful in patients with other significant medical problems. According to the National Cancer Institute, "targeted cancer therapies will give doctors a better way to tailor cancer treatment."
- Coughing that doesn't go away
- Persistent chest pain
- Shortness of breath, wheezing
- Coughing up blood
- Swelling of the face and neck
- Loss of appetite and weight
Lung Cancer Diagnosis
There are a number of tests that can help in the diagnosis of cancer, including blood tests, physical examination and a variety of imaging techniques including X-rays (e.g., chest X-rays and mammograms), computed tomography (CT), magnetic resonance (MR) and ultrasound. Usually, however, the final diagnosis cannot be made until a biopsy is performed. In a biopsy, a sample of tissue from the tumor or other abnormality is obtained and examined by a pathologist. By examining the biopsy sample, pathologists and other experts also can determine what kind of cancer is present and whether it is likely to be fast or slow growing. This information is important in deciding the best type of treatment. Open surgery is sometimes performed to obtain a tissue sample for biopsy. But in most cases, tissue samples can be obtained without open surgery with interventional radiology techniques.
Needle biopsy, also called image-guided biopsy, is usually performed using a moving X-ray technique (fluoroscopy) computed tomography (CT), ultrasound or magnetic resonance (MR) to guide the procedure. In many cases, needle biopsies are performed with the aid of equipment that creates a computer-generated image and allows radiologists to see an area inside the body from various angles. This "stereotactic" equipment helps them pinpoint the exact location of the abnormal tissue.
Needle biopsy is typically an outpatient procedure with very infrequent complications; less than 1 percent of patients develop bleeding or infection. In about 90 percent of patients, needle biopsy provides enough tissue for the pathologist to determine the cause of the abnormality.
Advantages of needle biopsy include:
- With image guidance, the abnormality can be biopsied while important nearby structures (such as blood vessels and vital organs) can be seen and avoided.
- The patient is spared the pain, scarring and complications associated with open surgery.
- Recovery times are usually shorter and patients can more quickly resume normal activities.
An X-ray of a needle inserted into the lung to obtain a sample for biopsy.
Large core needle biopsy: In this technique, a special needle is used that enables the interventional radiologist to obtain a larger biopsy sample. This technique is often used to obtain tissue samples from lumps or other abnormalities in the breast that are detected by physical examination or on mammograms or other imaging scans. Because approximately 80 percent of all breast abnormalities turn out not to be cancer, this technique is often preferred by women and their physicians because it:
- Is less painful and requires less recovery time than open surgical biopsy
- Avoids the scarring and disfigurement that may result from open surgery
A similar technique called fine needle aspiration can be used to withdraw cells from a suspected cancer. It also can diagnose fluids that have collected in the body. Sometimes, these fluid collections also may be drained through a catheter, such as when pockets of infection are diagnosed.
Many interventional radiology procedures for the diagnosis and treatment of cancer can be performed on an outpatient basis or during a short hospital stay. In many cases, the procedures:
- Offer new cancer treatment options
- Are less painful and debilitating for patients
- Result in quicker recoveries
- Have fewer side effects and complications.
Lung Cancer Treatments
Tumors need a blood supply, which they actively generate, to feed themselves and grow. As vascular experts, interventional radiologists are uniquely skilled in using the vascular system to deliver targeted treatments via catheter throughout the body. In treating cancer patients, interventional radiologists can attack the cancer tumor from inside the body without medicating or affecting other parts of the body by using embolization and radiofrequency heat.
Thermal Ablation Treatments
By the time lung cancer becomes symptomatic, 85 percent of patients are incurable, often due to serious coexisting health conditions or poor respiratory function. Most patients who are diagnosed with non-small cell lung cancer are not surgically resectable at the time of diagnosis. For these patients, minimally invasive interventional radiology procedures can help reduce pain and improve quality of life.
Radiofrequency ablation (RFA) offers a nonsurgical, localized treatment that kills the tumor cells with heat, while sparing nearby healthy lung tissue. Thus, this treatment is much easier on the patient than systemic therapy. Radiofrequency energy can be given without affecting the patient's overall health and most people can resume their usual activities in a few days. It is a safe, minimally invasive tool for local pulmonary tumor control with negligible mortality, little morbidity, short hospital stay, and positive gain in quality of life.
In this procedure, the interventional radiologist guides a small needle through the skin into the tumor. From the tip of the needle, radiofrequency energy (similar to microwaves) is transmitted to the tip of the needle, where it produces heat in the tissues. The dead tumor tissue shrinks and slowly forms a scar. It is ideal for nonsurgical candidates and those with smaller tumors. The FDA has approved RFA for the treatment of tumors in soft tissue that includes the lung.
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Efficacy of RFA
Depending on the size of the tumor, RFA can shrink or kill the tumor. Because it is a local treatment that does not harm much healthy tissue, the treatment can be repeated as often as needed to keep patients comfortable. It is a relatively safe procedure, with low complication rates.
By decreasing the size of a large mass, or treating new tumors in the lung as they arise, the pain and other debilitating symptoms caused by the tumors are often relieved. While the tumors themselves may not be painful, when they press against nerves or interfere with vital organs, they can cause pain. RFA is effective for small to medium-sized tumors and emerging new technologies should allow the treatment of larger cancers in the future. RFA is a new treatment that has shown early, promising results, but long-term studies have not yet been completed.
A LIVER TUMOR TREATED WITH RFA
Dead tissue appears larger and darker than the living tumor. Over time, the tumor shrinks as the body absorbs and excretes dead cells
- Is most effective when all the cancer is localized in the lung
- Can be used to treat primary lung cancer and tumors that have metastasized (spread) from other areas in the body to the lung
- Usually does not require general anesthesia
- Relatively low cost
- Is well tolerated: most patients can resume their normal routine the next day and may feel tired for a few days
- It can be repeated if necessary
- It may be combined with other treatment options
- It can relieve pain and suffering for many cancer patients
- It has a short hospital stay
- It has few complications
Interventional radiologists use special X-ray equipment to guide therapy directly to the site of tumors
Cryoablation is similar to RFA in that the energy is delivered directly into the tumor by a probe that is inserted through the skin. But rather than killing the tumor with heat, cryoablation uses an extremely cold gas to freeze it. This technique has been used for many years by surgeons in the operating room, but in the last few years, the needles have become small enough to be used by interventional radiologists through a small nick in the skin without the need for an operation. The "ice ball" that is created around the needle grows in size and destroys the frozen tumor cells.
Chemoembolization is a minimally invasive treatment for lung cancer that can be used when there is too much tumor to treat with radiofrequency ablation (RFA), when the tumor is in a location that cannot be treated with RFA, or in combination with RFA or other treatments.
Chemoembolization delivers a high dose of cancer-killing drug (chemotherapy) directly to the organ while depriving the tumor of its blood supply by blocking, or embolizing, the arteries feeding the tumor. Using imaging for guidance, the interventional radiologist threads a tiny catheter up the femoral artery in the groin into the blood vessels supplying the lung tumor. The embolic agents keep the chemotherapy drug in the tumor by blocking the flow to other areas of the body. This allows for a higher dose of chemotherapy drug to be used, because less of the drug is able to circulate to the healthy cells in the body. Chemoembolization usually involves a hospital stay of two to four days. Patients typically have lower than normal energy levels for about a month afterwards.
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Chemoembolization is a palliative, not a curative, treatment. Chemoembolization has shown promising early results with some types of metastatic tumors. Although the individual materials used in this treatment are FDA approved, the treatment itself is not approved specifically for intra-arterial therapy of lung tumors.
New Cancer Treatments on the Horizon
Interventional radiology is playing a role in developing new techniques that may improve cancer treatment in the future, including the use of magnetic particles to draw cancer-killing agents into tumors, and the delivery of genetic material, called gene therapy, to fight or prevent cancers. These techniques are still investigational, but they offer new hope in the war against cancer.
Interventional radiologists are currently investigating a new technique in which magnets are used to pull chemotherapy drugs into tumors. Microscopic magnetic particles are attached to the cancer-killing drugs and infused through a catheter into the blood vessel that feeds the tumor. A rare earth magnet is positioned over the patients body directly above the site of the tumor. The magnet pulls the drug-carrying particles out of the blood vessel so that they lodge in the tumor. Although the technique is still experimental, early research is promising. Physicians are hopeful that it will bolster the effects of chemotherapy while avoiding some of the drugs side effects, such as hair loss and nausea.
In recent years, scientists have gained a new understanding about genesthe basic biological units of heredityand the role they play in disease. This knowledge has set the stage for medical science to alter patients genetic material to fight or prevent cancer. Although the science of gene therapy is still in the early, experimental stages, researchers are hoping that in the future the therapy can be used to:
Researchers in gene therapy search for new ways to treat cancer and other genetic diseases
- Alter the cells of a patients natural immune system with cancer-fighting genes and returning them to the body, where they could more forcefully attack the cancer
- Remove cancer cells from the body and alter them genetically so that the patients own immune system will mount a strong defense against them. In this technique, the altered cancer cells would act as a cancer vaccine
- Replace a faulty gene responsible for the growth of cancer with a "good" gene
- Inject a tumor with genes that will make it more susceptible to chemotherapy or other cancer-fighting agents
- Make bone marrow and other organs resistant to chemotherapy, so that the drugs will destroy tumors without damaging healthy tissue
One of the challenges of gene therapy is finding safe and effective ways to deliver genes or genetically altered cells to the site of the tumor. Interventional radiologists, with their special expertise in using X-rays and other imaging techniques to guide catheters and other tools through the body are expected to play an important role in this new technology.
Treatments for Cancer Complications
There are also a number of interventional radiology techniques that are used to treat the complications of cancer, including pain, bleeding, obstruction of vital organs, blood clots and infection. Although these treatments do not cure cancer, they can make patients more comfortable, extend life by treating serious complications and improve the quality of life for cancer patients.
Control of pain is one of the most important aspects of cancer care. Pain not only affects patients quality of life and ability to function, it may also lower their tolerance for needed cancer treatments.
In many cancer patients, pain results from the spread of the tumor into surrounding nerves and other tissues. For example, patients with cancer of the pancreas or stomach, sometimes experience pain from the spread of the tumor into a network of nerves and blood vessels in the abdomen called the celiac plexus. To treat the pain, interventional radiologists insert catheters or needles into the affected area and administer alcohol or other agents that destroy the nerves causing the pain.
A particularly painful complication of cancer is when the disease spreads (metastasizes) to bones. In a technique called transcatheter embolization, interventional radiologists inject tiny particles, the size of grains of sand, through a catheter and into the artery that supplies blood to the tumor. The particles cause clotting that decreases the tumors blood supply, reducing pain and decreasing the likelihood of bone fracture.
If a cancer spreads to the blood vessels it may cause hemorrhage or bleeding. An interventional radiology technique called transcatheter embolization can be used to clot the affected blood vessels and stop the bleeding.
Treating Organ Obstruction and Infection
Cancers can obstruct the normal flow of urine or bile, causing these fluids to build up in the body. If left untreated, these conditions are not only painful but may also result in organ failure or infection. Under X-ray guidance, catheters can be inserted to drain the collection of fluids. Often, a small device called a stent is inserted into the organ to bypass the obstruction and allow fluids to drain internally.
Small mesh cylinders called stents are used to open obstructed organs and allow fluids such as urine and bile to drain.
Treating Blood Clots
One common side effect of cancer or cancer treatments is the development of blood clots, or emboli, that can be life-threatening if they travel to the brain, lungs or heart. There are two interventional radiology procedures that can reduce the risks posed by blood clots:
- Intra-arterial thrombolysis: In this technique, the interventional radiologist guides a catheter through the blood vessels and to the site of a blood clot. Clot-busting drugs are infused through the catheter to break up the clot.
- Filter placement: This technique is most often used when a blood clot is detected in the blood vessels of the leg (a condition called deep vein thrombosis). The interventional radiologist guides a small filter into the blood vessel that receives blood from the lower body (the vena cava) and carries it to the heart. If the blood clot dislodges from the vein in the leg, the filter will trap it before it can reach the heart.
Interventional Radiologists Are Minimally Invasive Experts
Interventional radiologists work with other specialists on a multidisciplinary cancer team to determine the best treatment for each individual patient. Interventional radiology is a recognized medical specialty by the American Board of Medical Specialties. Interventional radiologists are board-certified physicians with extensive training in disease diagnosis, management and treatment. Their board certification includes both Vascular and Interventional Radiology and Diagnostic Radiology, which are administered by the American Board of Radiology. This training marries state-of-the-art imaging and diagnostic expertise, coupled with clinical experience across all specialties and in-depth knowledge of the least invasive treatments. Interventional oncology is a growing area within interventional radiology.