SAN FRANCISCOCompared with surgery alone, the triple combination of chemotherapy, radiation therapy, and surgery is associated with a more than doubling of overall survival and a more than tripling of progression-free survival in patients with resectable esophageal cancer, according to a randomized trial presented at the 2006 Gastrointestinal Cancers Symposium (abstract 4).
"The concept behind this trial was to be a successor for the Intergroup study 0113. . . . That study looked at chemotherapy, followed by surgery and additional chemotherapy, compared with surgery alone," said lead author Mark J. Krasna, MD, chief of thoracic surgery, University of Maryland Medical Center. That study did not find a survival benefit for the combination therapy, he noted.
The new international and multi-institutional trial (CALGB 9781) randomized patients with stage I-III esophageal cancer to esophagectomy alone or to trimodality therapy consisting of combined chemotherapy (5-FU and cisplatin) and radiation therapy (50.4 Gy), followed 3 to 8 weeks later by esophagectomy.
Although target accrual was 400 patients, publication of favorable findings of another trial of trimodality therapy (N Engl J Med 335:462-467, 1996) led to reduced accrual. Final results were based on only 56 patients but were still dramatic enough to warrant reporting, he said. Patients were mostly male (91%) and white (86%); 75% had adenocarcinomas, typical of modern esophageal cancers in the United States.
At the time of surgery, Dr. Krasna said, the overall rate of pathologic response (complete response and partial response) in the trimodality group was 80%, while the rate of complete response alone was 40%. The preoperative therapy was associated with moderate morbidity: grade 3 hematologic toxicity in 54% of patients in this group, and grade 3 gastrointestinal toxicity (mainly esophagitis) in 40%.
Surgical complications occurred in 54% of patients in the surgery-alone arm and in 57% of those in the trimodality arm. There were two cases of leaks between the esophagus and stomach (both in the trimodality arm) and two cases of postoperative death (both in the surgery-alone arm). "The postoperative stay in the hospital was relatively short," Dr. Krasna noted (median 11.5 and 10 days in the surgery and trimodality groups, respectively). The median follow-up for the entire study population was 6 years.
Survival Differences 'Stark'
"The survival differences were stark," Dr. Krasna commented. Median overall survival in the trimodality group was more than double that in the surgery- alone group (4.5 vs 1.8 years). In addition, the 5-year survival rate differed significantly and was roughly three times higher in the former group than in the latter (39% vs 16%). Median progression-free survival also differed significantly between the trimodality and surgery groups (3.5 vs 1.0 years).