Stage I pancreatic cancer, refers to cancer that is confined to the pancreas. Stage I cancer does not extend beyond the confines of the pancreas, does not involve any adjacent organs, has not spread to any of the local lymph nodes and cannot be detected in other locations in the body. Most early pancreatic cancers can be removed by surgery. Unfortunately, early pancreatic cancer only accounts for a minority of newly diagnosed patients. To help increase the chance of being cured, and improve survival of patients with early-stage cancer, a combination of anti-cancer drugs and/or radiation therapy is often given in addition to surgery.
Currently, the best treatment for Stage I adenocarcinoma of the pancreas is surgical removal of the cancer. Depending on the features of the cancer, approximately 10-35% of patients will be alive and without evidence of cancer five years after surgery. The most common surgical procedure is a pancreaticoduodenectomy, or Whipple procedure, which involves removal of a portion of the pancreas, small intestine (duodenum), and stomach, as well as the entire gallbladder. The exact surgical procedure may differ based on the location and extent of the cancer within the pancreas. To learn more, go to Surgery for Pancreatic Cancer.
Despite undergoing surgical removal of all visible cancer, approximately 60-70% of patients with Stage I pancreatic cancer will experience a recurrence of their cancer. A recurrence is caused by a small amount of cancer that spread outside the pancreas and therefore, was not removed by surgery. These cancer cells are referred to as micrometastases and cannot be detected with any of the currently available tests. The presence of micrometastases causes the relapses that follow treatment with surgery alone. In order to cleanse the body of micrometastases and reduce the risk of recurrence, it may be necessary to undergo additional systemic treatment before or after surgery. Therapy administered before surgery is called neoadjuvant, and therapy after surgery is called adjuvant therapy. Both neoadjuvant and adjuvant therapy are increasingly used to treat patients with early-stage pancreatic cancer.
The following is a general overview of treatment for Stage I pancreatic cancer. Treatment may consist of surgery, radiation, chemotherapy, biological therapy, or a combination of these treatment techniques. Multi-modality treatment is treatment using two or more techniques, and is increasingly recognized as an important approach for improving a patient’s chance of cure or prolonging survival. In some cases, participation in a clinical trial utilizing new, innovative therapies may provide the most promising treatment. Circumstances unique to each patient’s situation may influence how these general treatment principles are applied and whether the patient decides to receive treatment. The potential benefits of multi-modality care, participation in a clinical trial, or standard treatment must be carefully balanced with the potential risks. The information on this Web site is intended to help educate patients about their treatment options and to facilitate a mutual or shared decision-making process with their treating cancer physician.
Systemic therapy is treatment directed at destroying cancer cells throughout the body. Many patients with Stage I pancreatic cancer already have small amounts of cancer that have spread outside the pancreas (micrometastases). An effective systemic treatment is needed to cleanse the body of micrometastases in order to improve a patient’s duration of survival and potential for cure. Systemic treatment administered after surgery is called adjuvant therapy and treatment before surgery is called neoadjuvant therapy. Currently, adjuvant therapy is the recommended systemic therapy for patients with Stage I pancreatic cancer; neoadjuvant therapy, however, is increasingly being evaluated. Adjuvant therapy may include chemotherapy, radiation therapy, biologic therapy or a combination of therapies.
Chemotherapy: Chemotherapy is any treatment involving the use of drugs to kill cancer cells. Cancer chemotherapy may consist of single drugs or combinations of drugs and can be administered through a vein or delivered orally in the form of a pill. Gemzar® (gemcitabine) is FDA-approved for the treatment of pancreatic cancer and is now considered the standard initial chemotherapy drug for early-stage and advanced disease. Gemzar has been shown to improve response to treatment, time to cancer progression, and survival duration when compared with the older chemotherapy drug 5-fluorouracil (5-FU).1 In a clinical trial involving patients with advanced pancreatic cancer, patients who received Gemzar experienced a significant improvement in disease-related symptoms as well as prolonged survival compared to patients who received 5-FU.
Radiation therapy, or radiotherapy, uses high-energy rays to damage or kill cancer cells by preventing them from growing and dividing. Similar to surgery, radiation therapy is a local treatment used to eliminate or eradicate visible cancers. Radiation therapy is not typically useful in eradicating cancer cells that have already spread to other parts of the body. It is particularly effective as an adjuvant therapy (therapy given in addition to the primary treatment) to surgery by helping to eliminate any microscopic cancer cells leftover after surgery. Clinical studies that have evaluated adjuvant radiation therapy have yielded conflicting results and there currently remains no consensus whether radiation should be used as adjuvant therapy or combined with chemotherapy for the treatment of pancreatic cancer although it is offered to many patients.23 Patients should clearly understand the risks and benefits of being treated with radiation and discuss them with their physician.
Strategies to Improve Treatment of Stage I Pancreatic Cancer
The development of more effective cancer treatments requires that new and innovative therapies be evaluated with cancer patients. Clinical trials are studies that evaluate the effectiveness of new drugs or treatment strategies. Future progress in the treatment of Stage I pancreatic cancer will result from the continued evaluation of new treatments in clinical trials. Participation in a clinical trial may offer patients access to better treatments and advance the existing knowledge about treatment of this cancer. Patients who are interested in participating in a clinical trial should discuss the risks and benefits of clinical trials with their physician. Areas of active investigation aimed at improving the treatment of Stage I pancreatic cancer include the following:
Advances in Systemic Adjuvant Therapy: Chemotherapy and Targeted Therapy
Systemic therapy is treatment directed at destroying cancer cells throughout the body. Because patients with pancreatic cancer have small amounts of cancer that have spread away from the pancreas, an effective systemic treatment is needed to cleanse the body of micrometastases in order to improve a patient’s duration of survival and potential for cure.
Although it appears that more patients respond to combination treatment than single-agent treatment, only Tarceva® (erlotinib) has been demonstrated to improve survival when combined with Gemzar in a direct comparison. It has not been determined whether patients who receive other combinations live longer than those who receive single-agent Gemzar or Gemzar combined with Tarceva (see table 1). This is because the clinical trials evaluating the combinations in Table 1 have not been directly compared to single-agent Gemzar in a controlled clinical trial.
Table 1 Results from seven trials that evaluated different chemotherapy regimens in the treatment of advanced pancreatic cancer
|30* or 31%**
||26* or 47%**
*patients with locally-advanced disease (IVA)
**patients with metastatic disease (IVB)
***not measured in this trial
A targeted therapy is one that is designed to treat only the cancer cells and minimize damage to normal, healthy cells. Cancer treatments that “target” cancer cells may offer the advantage of reduced treatment-related side effects and improved outcomes. Conventional cancer treatments, such as chemotherapy and radiation therapy, cannot distinguish between cancer cells and healthy cells. Consequently, healthy cells are commonly damaged in the process of treating the cancer, which results in side effects. Chemotherapy damages rapidly dividing cells, a hallmark trait of cancer cells. In the process, healthy cells that are also rapidly dividing, such as blood cells and the cells lining the mouth and GI tract, are also damaged. Advances in science and technology have led to the development of several different types of targeted therapies that are being evaluated in clinical trials.
Herceptin® (trastuzumab): Herceptin is a monoclonal antibody, which is a type of targeted therapy that binds to the HER2 receptor, (a protein on the surface of the cancer cells) in approximately 20% of patients with pancreatic cancer. This binding action promotes anticancer benefits through two distinct processes. First, the binding of Herceptin blocks growth factors from binding to HER2, thereby eliminating their stimulating effects on cancer cells. Second, the binding action of Herceptin appears to stimulate the immune system to attack and kill the cancer cells to which Herceptin is bound.
Researchers from Brown University have found that treatment of patients with advanced pancreatic cancers that overexpress HER2 with Gemzar plus Herceptin appears to produce longer survival than treatment with Gemzar alone. Approximately 72% of patients treated with the combination demonstrated an anticancer response. Approximately 24% of patients lived one year or more following treatment.11
Erbitux® (cetuximab): Another targeted monoclonal antibody therapy, Erbitux, binds to epidermal growth factor receptors (EGFR), thereby suppressing cancer growth and spread. Erbitux was FDA-approved for the treatment of colon cancer in February 2004 and is being evaluated in other cancers including pancreatic cancer.
Researchers from the M.D. Anderson Cancer Center have reported that the addition of Erbitux to Gemzar may improve survival for patients with advanced pancreatic cancer. This trial involved 40 patients with advanced pancreatic cancer who had tested positive for over expression of EGFR. Results indicate that more of the patients who received Gemzar plus Erbitux lived one year or more and were cancer-free for longer than patients who were treated with Gemzar alone (see table 2).12
Table 2 Gemzar with and without Erbitux
||Gemzar alone (historical data)
More recently, researchers in Italy evaluated the addition of Erbitux to Gemzar and Platinol among patients with advanced pancreatic cancer.13 Patients treated with all three drugs (Erbitux, Gemzar, and Platinol) did not have better outcomes than patients treated only with Gemzar and Platinol. Other studies, however, are continuing to evaluate the role of Erbitux in the treatment of pancreatic cancer.
More than 85% of pancreatic cancers have mutations in the ras gene; these malignant cells contain a unique enzyme (known as farnesyl transferase) whose activity appears to be required if the cells with the mutation are to divide. Specific drugs that inhibit farnesyl transferase have been developed and are being evaluated in clinical trials. Similarly, methods are being explored through which the normal (rather than mutated) gene can be directly injected into a tumor mass with the hope that a return to the usual pattern of cell division will lead to tumor regression.
Doctors evaluated the feasibility of using a specific mutant ras peptide vaccine as an adjuvant immunotherapy in pancreatic and colorectal cancer patients. Twelve patients with no evidence of disease after surgery, five with pancreatic cancer, and seven colorectal cancers were vaccinated subcutaneously with 13-mer mutant ras peptide, corresponding to their tumor’s ras mutation. Vaccinations were given every four weeks, up to a total of six vaccines. No serious side effects were reported, and five out of eleven patients showed a positive immune response. The five pancreatic cancer patients had an average overall survival of more than 44 months, and the seven colorectal cancer patients had an average overall survival of over 41 months.14
Biological therapies are naturally occurring or synthesized substances that direct, facilitate, or enhance the body’s normal immune defenses. Biologic therapies include interferon, interleukins, monoclonal antibodies, vaccines, and other compounds. Monoclonal antibodies are proteins that can be made in the laboratory and are designed to recognize and bind to very specific sites on a cell. This binding action promotes anti-cancer benefits by eliminating the stimulating effects of growth factors and by stimulating the immune system to attack and kill the cancer cells to which the monoclonal antibody is bound. In an attempt to improve survival rates, the following biological therapies are being tested alone or in combination with chemotherapy in clinical trials:
Vaccines: The purpose of a vaccine is to help the patient’s immune system destroy the cancer by activating the patient’s immune cells against the cancer. Vaccines are made from a variety of substances that often include the actual cancer cells removed from the patient. A difficulty in preparing vaccines is that the patient’s cancer cells must be processed immediately following surgery. Patients and their surgeon must therefore prepare in advance to ensure the removed cancer cells can be handled properly for vaccine preparation. Vaccines are currently being evaluated in clinical studies.
Researchers from the Johns Hopkins Kimmel Cancer Center conducted a Phase II trial to evaluate the GVAX vaccine designed to stimulate the immune system to fight pancreatic cancer.15 The vaccine is comprised of radiated pancreatic cancer cells that are not able to replicate or grow. The cells have been modified to secrete a substance referred to as granulocyte macrophage colony stimulating factor (GM-CSF), which stimulates the immune system to recognize pancreatic cancer cells and attack them.
The trial included 56 patients who underwent the surgical removal of their cancer, followed by the first vaccine at eight weeks post surgery. One month later, standard chemotherapy and radiation were administered, followed by three more vaccines given every month. The final vaccine booster is given at six months following chemotherapy/radiation.
At a median follow-up of 32 months:
- Survival at one year was 88%.
- Survival at two years was 76%.
The researchers concluded that the addition of the cancer vaccine to standard chemotherapy and radiation therapy appears promising when comparing one- and two-year survival rates to historical rates of survival in patients with operable pancreatic cancer.
Virulizin®: Virulizin is a biological therapy that activates the body’s own immune system to recognize and eliminate cancer cells. The exact mechanism by which Virulizin works has not been identified with certainty. However, researchers think that it induces apoptosis (cell death) of cancer cells by stimulating the release of tumor necrosis factor and stimulating macrophages, the clean-up cells of the immune system.
An early-phase clinical trial evaluating Virulizin in the treatment of pancreatic cancer demonstrated that 58% of patients lived six months or longer. On average, patients lived 6.8 months. Treatment with Virulizin was well tolerated. In the Phase III trial the addition of Virulizin to Gemzar resulted in a median overall survival of 6.8 months and a one-year survival rate of 27.2% compared with six months and 16.8% for Gemzar alone.16 Virulizin is not currently FDA approved for the treatment of pancreatic cancer in the United States.
New Radiation Therapy Techniques
Three-dimensional conformal radiation therapy (3D-CRT): 3D-CRT can precisely target radiation to the areas where cancer cells may be located and therefore minimize side effects from radiation to normal structures such as the liver, stomach, and kidneys. Because many patients with advanced pancreatic cancer may develop areas of cancer cells in the liver, low-dose radiation therapy aimed at the entire liver has been used in an attempt to destroy these cancer cells.
Photodynamic therapy is an emerging type of treatment that is still being evaluated and refined in clinical trials and laboratories. Photodynamic therapy works through the use of a photosensitizing agent and light. The photosensitizing agent is injected into a patient’s vein a couple of hours prior to surgery. During this time the agent selectively collects in rapidly growing cells such as cancer cells. During surgery the physician applies a certain wavelength of light through a handheld wand directly to the site of the cancer and surrounding tissues. The energy from the light activates the photosensitizing agent, causing the production of a toxin that accumulates in the cancer cells and ultimately destroys them.
Researchers from England have reported that photodynamic therapy may be a safe and effective treatment option for some patients with inoperable pancreatic cancer. In this trial 16 patients were first given the photosensitizing agent meso-tetrahydroxyphenyl chlorine through a vein. Three days later light was delivered to the cancer through the guidance of computerized tomography (CT) scans. Fourteen patients were able to leave the hospital within 10 days. The average survival time was 9.5 months, and 44% of the patients were alive at one year following therapy. Treatment was very well tolerated in the majority of patients; however, two patients developed bleeding that was controlled by surgery, and three patients developed an obstruction in their large intestine.17
In an effort to increase the chance that a cancer may be surgically removed, some cancer centers may use radiation therapy and chemotherapy before surgery to shrink the cancer. The use of treatment before surgery is referred to as “neoadjuvant therapy.” In addition to potentially shrinking cancer so that it can be removed, neoadjuvant therapy allows patients to avoid the difficulty of undergoing treatments after surgery, which is a time when they may be experiencing side effects. Surgery to remove pancreatic cancer is associated with substantial side effects that may delay further treatment or may even render a patient incapable to tolerating adjuvant treatment. Approximately 25% to 33% of patients are unable to receive chemotherapy or radiation treatment following surgery. Furthermore, a treatment plan that includes neoadjuvant therapy guarantees that systemic therapy is delivered immediately, which may increase the chance of eradicating small amounts of cancer that may have already spread to distant locations in the body and cannot be removed by surgery. Clinical trials are ongoing to evaluate neoadjuvant chemotherapy administered alone or in combination with adjuvant therapy, and the results of some small studies suggest that neoadjuvant therapy may improve survival.18
Managing Side Effects
Managing the side effects of cancer and/or cancer treatment is an important part of receiving optimal care. Side effects cause inconvenience, discomfort, and may occasionally be fatal. Additionally, side effects may prevent doctors from delivering the prescribed dose of therapy at the specific time and schedule of the treatment plan. Because the expected outcome from therapy is based on delivering treatment at the dose and schedule prescribed in the treatment plan, a change from the treatment plan may reduce your chance of achieving an optimal outcome. This is extremely important to understand. In other words, side effects not only cause discomfort and unpleasantness, but may also compromise your chance of cure by preventing the delivery of therapy at its optimal dose and time. For more information, go to Managing Side Effects.
Newer Surgical Procedures
Extended pancreaticoduodenectomy: More extensive operations for pancreatic cancer have been advocated by some surgeons. The goal is to remove all visible cancer plus more tissue that may contain cancer in order to reduce the chance of recurrence. Regional or extended pancreaticoduodenectomy is an extensive surgical procedure that involves removal of surrounding veins and more lymph nodes. This procedure has been promoted by some institutions in the United States and surgeons from Japan.
Pylorus-preserving surgery: During a standard Whipple resection, the pylorus, or “valve” that controls emptying of the stomach, is removed. This can cause “dumping syndromes” and difficulty with the absorption of nutrition from the gastrointestinal tract. By preserving the pylorus, gastric dumping can be reduced; however, it is important that adequate surgical removal of the cancer is not compromised by this procedure.
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13 Cascinu S, Berardi R, Labianca R, et al. Cetuximab plus gemcitabine and cisplatin compared with gemcitabine and cisplatin alone in patients with advanced pancreatic cancer: a randomised, multicentre, Phase II trial. Lancet Oncology. 2008; 9:39-44.
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16 Lorus Therapeutics Inc. Press Release. Lorus announces results of Virulizin Phase III Clinical Trial. October 18, 2005. Available at: http://www.lorusthera.com/investor/engpr/2005_Virulizin_clinical_trial.pdf (Accessed April 7, 2008).
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