When pancreatic cancer has returned following initial treatment, it is referred to as recurrent or relapsed cancer. Recurrent pancreatic cancer is very difficult to treat and treatment options are limited.
Some patients are offered treatment with chemotherapy for the purpose of prolonging their duration of survival and alleviating symptoms from progressive cancer. Most patients with recurrent pancreatic cancer have already received 5-fluouracil or Gemzar®-based chemotherapy. Once a patient’s cancer has returned after being treated with chemotherapy, the ability of other chemotherapy drugs to kill the cancer cells is disappointingly low. Therefore, many patients with recurrent pancreatic cancer are offered therapies aimed at palliation, or relief of the uncomfortable side effects of their cancer and/or cancer treatment. This approach is sometimes called supportive care. Pain relief can be achieved by destroying the nerves that provide sensation from the area around the pancreas. This is usually performed by injection of alcohol or other chemicals during an open abdominal operation or via a skin injection.
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Strategies to Improve Treatment of Recurrent 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 recurrent 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 exploration to improve the treatment of recurrent pancreatic cancer include the following:
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 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
|Response rate||1-year survival||Overall survival|
|Gemzar/ Platinol® (cisplatin)||26%||NA||7.5 months|
|Gemzar/ Camptosar® (irinotecan)||32%||27%||9 months|
|Gemzar/ Alimta® (pemetrexed)||15%||30%||6.5 months|
|Gemzar/ Eloxatin® (oxaliplatin)||30 or 31%||26 or 47%||NA|
|Gemzar/5FU/Platinol/Ellence® (epirubicin)||58%||NA||11 months|
|Taxotere® (docetaxel)/ Doxil® (doxorubicin)||30%||33%||10 months|
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.
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).
More recently, researchers in Italy evaluated the addition of Erbitux to Gemzar and Platinol among patients with advanced pancreatic cancer. 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.
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