Gastrointestinal Cancer

Preliminary clinical data presented at a poster session of the 1999 annual meeting of the American Society of Clinical Oncology (ASCO) revealed that a significant number of patients with advanced colorectal cancer respond to first-line treatment with raltitrexed (Tomudex) in combination with oxaliplatin. The response rate of 59% suggests that this regimen may be one of the more active combinations under current investigation for the disease.

NEW YORK-Although it is often not possible to offer curative treatment in pancreatic cancer, significant improvements have taken place nonetheless, said Ephraim S. Casper, MD, chief medical oncologist, Memorial Sloan-Kettering Cancer Center at St. Clare’s Hospital, Denville, NJ.

NEW YORK-A new oral combination chemotherapy regimen is as effective as intravenous fluorouracil (5-FU) and leucovorin, the current treatment standard, but with a superior safety profile. Speaking at the Chemotherapy Foundation Symposium XVII, Paulo Hoff, MD, assistant professor of medicine, M.D. Anderson Cancer Center, described the use of an oral regimen combining uracil/tegafur (UFT) and leucovorin as first-line treatment of metastatic colorectal cancer.

NEW YORK-The folate antagonist trimetrexate (TMTX) may be useful as a biochemical modulator of fluorouracil (5-FU) in the treatment of advanced colorectal cancer, according to preliminary results of a phase III trial conducted by the European TMTX Study Group and discussed at the Chemotherapy Foundation Symposium XVII

BUFFALO, NY-Colorectal cancer is caused by a multistep process, taking up to 25 years for an adenocarcinoma to develop. This offers multiple opportunities for prevention strategies to intervene and decrease the incidence of this disease.

NEW YORK-A regimen of twice-weekly gemcitabine (Gemzar) plus radiation therapy in patients with unresectable pancreatic cancer appears promising, according to results of a phase I dose escalation study presented at the Chemotherapy Foundation Symposium XVII. The twice-weekly delivery may be more cytotoxic than standard once-weekly dosing, and gemcitabine may act as a radiation sensitizer, said A. William Blackstock, MD, assistant professor of Radiation Oncology, Wake Forest University, Winston-Salem, NC.

VIENNA, Austria-The combination regimen of 5-fluorouracil (5-FU) and levamisole is one of the National Cancer Institute’s recommendations for adjuvant treatment of stage C colorectal cancer. However, results from the first 5,000 patients enrolled in the QUASAR trial suggest that this advice may be open to question. “There is no improvement in survival or recurrence rate with levamisole, and there is no worthwhile benefit from high-dose folinic acid as compared with low-dose folinic acid,” QUASAR investigator R.G. Gray, MD, of the University of Birmingham (UK), said at the 10th European Cancer Conference (ECCO).

BUFFALO, NY-Recent advances in colorectal cancer detection and treatment planning are improving quality of life and disease control in colorectal cancer patients, according to research discussed at the Roswell Park Cancer Institute Surgical Oncology Symposium.

ORLANDO-At the Digestive Disease Week meeting, University of Tokyo researchers reported on the largest single-institution study of the use of percutaneous ethanol injection therapy (PEIT) in hepatocellular carcinoma (HCC). The research group studied 849 patients hospitalized for HCC at their institution between 1985 and 1997.

BUFFALO, NY-Over the past several years, the focus of breast cancer treatment has shifted from late detection and radical surgery to early detection, breast-conserving surgery, and multimodality treatment. This “paradigm shift” may also be applicable to colorectal cancer, Glenn D. Steele, Jr., MD, PhD, dean of the Biological Sciences Division, Pritzker School of Medicine, University of Chicago, said at a surgical oncology symposium hosted by Roswell Park Cancer Institute. Dr. Steele was the recipient of the Roswell Park Centennial Award.

This article by Yao, Shimada, and Ajani accurately describes the current state of the art of adjuvant therapy for gastric cancer. The authors’ primary conclusion and current recommendations are as follows:

Yao and colleagues present a concise, yet complete review and analysis of adjuvant therapeutic approaches for gastric adenocarcinoma. They confirm a fact known to all clinical oncologists who manage patients with resected gastric cancer: No adequate data support the value of postoperative (adjuvant) or preoperative (neoadjuvant) therapy in managing patients with locally advanced adenocarcinoma of the stomach.

Gastric carcinoma is a discouraging disease. Although we can clearly identify patient- and tumor-related variables that predict outcome, the only reproducible treatment- related variable associated with an improvement in survival is a complete (R0) resection.[1]

Gastric cancer is often advanced and unresectable at diagnosis. Even when a curative resection is possible, the 5-year survival rate for patients with T2 or higher tumors is less than 50%. Survival rates are even lower if lymph node metastases are present at surgery. Many phase III trials of adjuvant therapy have been conducted around the world during the past 4 decades, but their interpretation varies in the East and West. In the West, postoperative treatment modalities have not proven to be superior to postsurgical observation alone. Thus, at present, the routine use of postoperative therapy should be discouraged. In the Orient, however, routine use of postoperative chemotherapy and/or immunotherapy is common after a surgical procedure. Further investigations that correlate treatment response with molecular markers are needed. Improved clinical trial designs, including better preoperative staging, standardized surgical techniques, inclusion of adequate numbers of patients, and the continued use of a surgery-alone control group, are essential. In addition, the incorporation of newer active agents, radiotherapy, and new strategies, such as preoperative therapy and selection of patients based on tumor biology, would result in much-needed advances. Less toxic approaches with novel mechanisms of action, such as antiangiogenesis therapy, tumor vaccines, monoclonal antibodies, and matrix metalloproteinase inhibitors, also hold promise. [ONCOLOGY 13(11):1485-1494, 1999]

ORLANDO-Researchers in Germany have found that in cases of advanced colorectal cancer that has metastasized to and destroyed more than 30% of the liver, surgical removal of the colorectal tumor does not benefit the patient. On the contrary, said Sandra Mitic, MD, “these seriously ill patients, who are soon to die anyway, are better off if surgeons perform the most limited procedure possible.” Dr. Mitic described the study in a poster presentation at the Digestive Disease Week meeting.

BETHESDA, Md-The National Cancer Institute has launched a double-blind study of thalidomide (Thalomid) to test its effectiveness in preventing colorectal cancer recurrence. The study will enroll 94 patients who will make their medical visits at the National Institutes of Health. Half will receive thalidomide, and half will get a placebo.

BETHESDA, Md-National Cancer Institute researchers have begun the first national study aimed at identifying barriers to screening for colorectal cancer. Investigators from the Centers for Disease Control and Prevention and the Health Care Financing Administration are collaborating in the effort.

NOTTINGHAM, UK-In a phase III multinational study, UFT capsules (uracil/tegafur) in combination with leucovorin calcium tablets proved as effective as IV fluorouracil (5-FU)/leucovorin, and much less toxic, when used as first-line treatment of metastatic colorec-tal cancer, James Carmichael, MD, of Nottingham City Hospital, UK, reported at the 35th annual meeting of the American Society of Clinical Oncology in Atlanta. [The FDA’s Oncologic Drugs Advisory Committee has recommended that UFT capsules plus oral leucovorin be approved for advanced colorectal cancer; a complete report will appear next month.]

WASHINGTON-Rats with chemically induced colon cancer that were fed orange juice for 4 weeks had a significantly lower incidence of colon cancer tumors than those receiving water, in a study at Michigan State University, East Lansing. Maurice R. Bennink, PhD, professor of food science and human nutrition, presented the results at the American Institute for Cancer Research 9th Annual Research Conference.

Both gastric and pancreatic cancer remain leading causes of cancer death in the United States and worldwide. While surgical resection continues to be required for long-term cure of both these neoplasms, 5-year survival

NEW YORK-An innovative clinical trial to be conducted at Columbia University is now recruiting patients with advanced pancreatic cancer. The patients will test the effectiveness of the “Gonzalez regimen,” which combines a strict diet of fresh fruits, vegetable juices, dietary supplements, and pancreatic enzyme extracts with a “detoxification” program. John Chabot, MD, a surgical oncologist at Columbia, is the principal investigator.

An innovative clinical trial to be conducted at ColumbiaUniversity in New York City for people diagnosed with advanced pancreatic cancer is now recruiting patients. The volunteer patients will test the effectiveness of what is called “the Gonzalez

PHILADELPHIA-Results of a phase I/II study showed that Virulizin, an investigational monocyte and macrophage activator, has clinical activity in treating advanced pancreatic cancer comparable to that of gemcitabine (Gemzar) and with a “much better” safety profile, Changnian Liu, MD, PhD, of the University of Nebraska Medical Center, reported at the annual meeting of the American Association for Cancer Research.

A treatment for patients with advanced colorectal cancer that has spread to the liver has been found to increase life expectancy, said Dr. Nancy Kemeny, an oncologist at Memorial Sloan-Kettering Cancer Center. This treatment combines

ORLANDO-The delivery of neurolytic chemicals to the celiac plexus, guided by endoscopic ultrasound, has been shown to be an effective, convenient, and safe technique to provide pain relief for pancreatic cancer patients.

An innovative clinical trial to be conducted at Columbia University in New York City forpeople diagnosed with advanced pancreatic cancer is now recruiting patients. The volunteer patients will test the effectiveness of what is called “the Gonzalez

NEW YORK-An innovative clinical trial to be conducted at Columbia University is now recruiting patients with advanced pancreatic cancer. The patients will test the effectiveness of the “Gonzalez regimen,” which combines a strict diet of fresh fruits, vegetable juices, dietary supplements, and pancreatic enzyme extracts with a “detoxification” program. John Chabot, MD, a surgical oncologist at Columbia, is the principal investigator.

ORLANDO-Researchers from the Johns Hopkins University Hereditary Colorectal Cancer Registry have identified what they believe is a previously unrecognized hereditary cancer syndrome. Patients with this syndrome, a variant of hereditary nonpolyposis colorectal cancer (HNPCC), exhibit cafe au lait spots and develop their malignancies at a much earlier age than do other HNPCC patients.

BETHESDA, Md-Enrollment has begun in a randomized phase III trial to test two promising new drugs, irinotecan (Camptosar), also known as CPT-11, and oxaliplatin (an experimental platinum), as initial therapy for advanced colorectal cancer. The National Cancer Institute (NCI) expects that all of the more than 500 centers in the United States and Canada participating in the study will be enrolling patients by summer’s end.

BALTIMORE-A series of colon cancer case studies presented at a meeting on clinical cancer genetics at Johns Hopkins University illustrated the complexity, medical and otherwise, that accompanies genetic testing for cancer.