Advanced gastric cancer: an update and future directions

Abstract

Gastric cancer is a common malignancy worldwide with a high mortality rate. Multiple single agents have produced response rates ranging from 5% to 45% in patients with metastatic gastric cancer. Combination chemotherapy regimens with two or three agents have more than doubled survivorship compared with best supportive care. Recent clinical trials include the evaluation of docetaxel, cisplatin, and 5-fluorouracil (5-FU), showing a survival advantage compared with cisplatin and 5-FU, although with high rates of toxicity, particularly neutropenia and neutropenic fever. The REAL-2 trial evaluated epirubicin and cisplatin with either infusional 5-FU (ECF) or capecitabine (ECX), and epirubicin and oxaliplatin with either infusional 5-FU (EOF) or capecitabine (EOX); results favored the EOX regimen. Oxaliplatin-containing triplets appear to have a favorable safety profile compared with cisplatin-containing triplets. Additional randomized data are available for the oral fluoropyrimidine, S-1. In a randomized trial comparing 5-FU vs. irinotecan plus cisplatin vs. S-1, conducted by the Japan Clinical Oncology Group, S-1 was associated with a favorable safety profile, response rate, and time-to-treatment failure with longer survival compared with 5-FU. The Japanese SPIRITS trial was a phase III comparison of S-1 vs. S-1 plus cisplatin and showed favorable 1- and 2-year survivals and a progression-free survival advantage for S-1 and cisplatin. Cooperative group strategies are evaluating the role of chemotherapy combinations, including cisplatin and docetaxel with biologic agents. In addition, there is interest in developing oxaliplatin-based combinations. The expanding list of potential molecular markers for gastric cancer may provide the opportunity to better understand the biology of the disease and to develop new treatment strategies.

Figure 1.

Overall survival by prognostic index (n=871). Abbreviation: CI = confidence interval. From Chau et al. Reprinted with permission from the American Society of Clinical Oncology.

Figure 2.

Kaplan-Meier estimates of (A) time to progression and (B) overall survival among chemotherapy-naive advanced gastric cancer patients treated with docetaxel, cisplatin, and fluorouracil (DCF) or cisplatin and fluorouracil (CF; full analysis population). From Van Cutsem et al. Reprinted with permission from the American Society of Clinical Oncology.