The role of multimodality therapy for esophageal cancer.
One trial has suggested improved survival with preoperative chemotherapy and radiation therapy with acceptable morbidity and mortality. Other studies have not demonstrated apparent improvement in survival, although the protocols are somewhat different. Longer follow-up is needed in these preliminary studies, and well-designed, prospective, multicenter randomized trials are necessary in the future. These studies should compare identical CRT and surgery regimens and identify a group of esophageal patients that might benefit from preoperative chemotherapy or radiation therapy. In order to evaluate the results of future trials without bias and to determine which group of esophageal patients will benefit from preoperative CRT, pretreatment, accurate TNM staging by CT and EUS combined with pathologic LN staging when possible will be crucial in future trimodality therapy trials for esophageal cancer. The investigation of biologic molecular markers to predict chemoradiation sensitivity and prognosis deserves careful exploration. Unfortunately, those patients without a response do not benefit from the preoperative chemotherapy but still may suffer the associated toxicity. These patients may have a much higher risk of postoperative fatal complications including respiratory failure, bone marrow suppression, and sepsis. It has been shown that CR patients in the chemotherapy/surgery group survive longer than nonresponders; it would be helpful to find useful molecular biomarkers to identify chemotherapy-sensitive patients before the preoperative chemotherapy is employed. Several pilot trials are underway using chemotherapy sensitivity testing on the endoscopic biopsy specimen before the chemotherapy is applied.
Krasna
M J
MJ
Thoracic Oncology Program, Greenebaum Cancer Center, University of Maryland Medical Center, Baltimore, USA. mkrasna@smail.umaryland.edu
Tepper
J
J
D017024:Chemotherapy, Adjuvant; D004938:Esophageal Neoplasms / Q000188:drug therapy* / Q000401:mortality / Q000473:pathology / Q000532:radiotherapy*; D006801:Humans; D008207:Lymphatic Metastasis; D009367:Neoplasm Staging; D011379:Prognosis; D018714:Radiotherapy, Adjuvant; D015996:Survival Rate; D016896:Treatment Outcome