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Gastric Cancer Therapy: Recognizing and Managing Fragmentation of Care and Evidence Gaps
Michael R. Page, PharmD, RPh; and Shriya Patel, PharmD
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Gastric Cancer Therapy: Recognizing and Managing Fragmentation of Care and Evidence Gaps

Michael R. Page, PharmD, RPh; and Shriya Patel, PharmD
The study examined how often patients require further chemotherapy after initial treatment. Of 1982 patients who received chemotherapy treatments, as indicated by EMR data, 42.3% required second-line treatment, 18.1% required third-line treatment, and 7.9% required fourth-line treatment.2 Of the 11,891 eligible patients in the administrative database, 5299 patients were identified as having received chemotherapy. Of these, 54.5% required chemotherapy as second-line treatment, and 30.2% required chemotherapy as third-line treatment.2

While no standard treatment regimen was identified following first-line therapy, Hess et al found that certain agents used for first-line treatment were used more often in second-line treatment in a variety of combinations.2 Using information from both databases, Hess et al found that for first-line therapy, a platinum-based treatment used alone or in combination with fluoropyrimidine was most often used (89.7% of patients from the EMR database and 88.7% of patients from the administrative database).2 Data from the EMR database and the administrative database also showed that 131 and 351 unique drug combinations, respectively, were used for second-line therapy.2 The distribution of patients who were indicated in the administrative database as having been on second-line treatment regimens is represented in the Figure.2

In addition to finding large variation in treatment regimens, Hess and colleagues also found great variability in costs. Third-party total healthcare costs for first-line treatment ranged from $7.89 to $933,828.53 with a mean of $40,810.87, and out-of-pocket total healthcare costs ranged from $0 to $33,513.16 with a mean of $926.11.

All-cause total costs following chemotherapy averaged $80,148.07 from the end of chemotherapy to death or end of patient record in the database. While costs often varied greatly, treatment was generally associated with a large patient financial burden.2 For patients who were hospitalized after chemotherapy, the average per-patient total cost per hospital stay was $85,769.49.2

Looking closely at the chemotherapy regimens documented in the databases, Hess et al found that few patients were treated using evidence-based regimens.2 Additionally, published data reveal that no randomized clinical trials assessing second-line chemotherapy regimens for gastric cancer were published after the year 2011.5 This suggests that a lack of current clinical data may be a contributing factor to the current variability and lack of standardization of care for gastric cancer.2

Although there has been a notable lack of progress in recent years, past clinical trials have demonstrated improved rates of survival in second-line treatment with a single agent, such as docetaxel, irinotecan, and ramucirumab, a monoclonal antibody vascular endothelial growth factor (VEGF) inhibitor.2 Survival outcomes have been reported for some combination therapies as well, including ramucirumab plus paclitaxel, which improved survival to a larger degree than paclitaxel monotherapy.2 Treatment arms and overall survival rates in other phase 3 clinical trials that have assessed second-line treatment regimens in patients with advanced gastric cancer are outlined in the Table.6-12,13

Targeted agents are a more recent approach in advanced gastric cancer treatment, and the number of clinical trials evaluating these agents has recently increased.3 Specific molecular targets being tested in clinical trials include epidermal growth factor receptor, VEGF, and HER2.3 Current data show poor efficacy of these targeted agents, suggesting the need to investigate new molecular targets to improve survival rates.3

Until the FDA approved the use of ramucirumab in 2014, few therapeutic options existed for progressive or recurrent gastric cancer. With the introduction of ramucirumab as a treatment option and its preferred status in current NCCN guidelines, physicians had a new option for second-line treatment for advanced gastric cancer.2,3 Ramucirumab has indications for use in metastatic non–small-cell lung cancer, metastatic colorectal cancer, and advanced gastric or gastroesophageal junction adenocarcinoma.14 Main phase 3 trials RAINBOW and REVEL have both demonstrated the efficacy and safety of ramucirumab for advanced gastric cancer.12

The RAINBOW trial compared the safety and efficacy of ramucirumab in combination with paclitaxel against paclitaxel with placebo, and the REGARD trial compared ramucirumab with placebo.7,12 Both trials found that both ramucirumab monotherapy and ramucirumab plus paclitaxel combination therapy demonstrated superior overall survival (OS) rates versus comparator treatments. In RAINBOW, median OS was 9.6 months with ramucirumab plus paclitaxel versus 7.4 months with placebo plus paclitaxel (P = .017). In REGARD, median OS was 5.2 months with ramucirumab alone versus 3.8 months with placebo (P = .047).7,12,15,16

Progression-free survival (PFS) was also measured in both trials. In the RAINBOW trial, PFS was 4.4 months for the ramucirumab plus paclitaxel treatment combination, and 2.9 months for the placebo plus paclitaxel treatment (P <.0001).12 In the REGARD trial, PFS was 2.1 months in the ramucirumab group and 1.3 months in the placebo group (P <.0001).7,15,16

Overall, chemotherapy has proven to be more beneficial than best supportive care for alleviating symptoms and prolonging survival for patients with advanced gastric cancer.15,16 These clinical studies should be used as a reference point for making treatment decisions for gastric cancer, and data from these clinical studies can be used to evaluate cost-effectiveness of different regimens and the order of care strategies, and to inform the best treatment options.2 In managing lines of therapy, oncologists should use the most up-to-date available evidence to maximize outcome and survival in patients with advanced gastric cancer. 

1. Ferlay J, Soerjomataram I, Dikshit R, et al. Cancer incidence and mortality worldwide: sources, methods and major patterns in GLOBOCAN 2012. Int J Cancer. 2015;136(5):E359-E356. doi: 10.1002/ijc.29210.
2. Hess LM, Michael D, Mytelka DS, Beyrer J, Liepa AM, Nicol S. Chemotherapy treatment patterns, costs, and outcomes of patients with gastric cancer in the United States: a retrospective analysis of electronic medical record (EMR) and administrative claims data. Gastric Cancer. 2016;19(2):607-615. doi: 10.1007/s10120-015-0486-z.
3. Bilici A. Treatment options in patients with metastatic gastric cancer: current status and future perspectives. World J Gastroenterol. 2014;20(14):3905-3915. doi: 10.3748/wjg.v20.i14.3905.
4. Gastric cancer. National Cancer Comprehensive Network website. www.nccn.org/professionals/physician_gls/pdf/gastric.pdf. Updated March 21, 2017. Accessed April 2017.
5. Karve S, Lorenzo M, Liepa AM, Hess LM, Kaye JA, Calingaert B. Treatment patterns, costs, and survival among Medicare-enrolled elderly patients diagnosed with advanced stage gastric cancer: analysis of a linked population-based cancer registry and administrative claims database. J Gastric Cancer. 2015;15(2):87-104. doi: 10.5230/jgc.2015.15.2.87.
6. Ford HE, Marshall A, Bridgewater JA, et al; COUGAR-02 Investigators. Docetaxel versus active symptom control for refractory oesophagogastric adenocarcinoma (COUGAR-02): an open-label, phase 3 randomised controlled trial. Lancet Oncol. 2014;15(1):78-86. doi: 10.1016/S1470-2045(13)70549-7.
7. Fuchs CS, Tomasek J, Yong CJ, et al; REGARD Trial Investigators. Ramucirumab monotherapy for previously treated advanced gastric or gastro-oesophageal junction adenocarcinoma (REGARD): an international, randomised, multicentre, placebo-controlled, phase 3 trial. Lancet. 2014;383(9911):31-39. doi: 10.1016/S0140-6736(13)61719-5.
8. Hironaka S, Ueda S, Yasui H, et al. Randomized, open-label, phase III study comparing irinotecan with paclitaxel in patients with advanced gastric cancer without severe peritoneal metastasis after failure of prior combination chemotherapy using fluoropyrimidine plus platinum: WJOG 4007 trial. J Clin Oncol. 2013;31(35):4438-4444. doi: 10.1200/JCO.2012.48.5805.
9. Kang JH, Lee SI, Lim DH, et al. Salvage chemotherapy for pretreated gastric cancer: a randomized phase III trial comparing chemotherapy plus best supportive care with best supportive care alone. J Clin Oncol. 2012;30(13):1513-1518. doi: 10.1200/JCO.2011.39.4585.
10. Thuss-Patience PC, Kretzschmar A, Bichev D, et al. Survival advantage for irinotecan versus best supportive care as second-line chemotherapy in gastric cancer—a randomised phase III study of the Arbeitsgemeinschaft Internistische Onkologie (AIO). Eur J Cancer. 2011;47(15):2306-2314. doi: 10.1016/j.ejca.2011.06.002.
11. Shimada K, Higuchi K, Hosaka N, et al; The Tokyo Cooperative Oncology Group. Randomized phase III trial of irinotecan plus cisplatin versus irinotecan alone after S-1 based chemotherapy failure for patients with advanced and recurrent gastric cancer (AGC) (TCOG GI-0801) [abstract 61]. J Clin Oncol. 2013;31(suppl 4). doi: 10.1200/jco.2013.31.4_suppl.61.
12. Wilke H, Muro K, Van Cutsem E, et al; RAINBOW Study Group. Ramucirumab plus paclitaxel versus placebo plus paclitaxel in patients with previously treated advanced gastric or gastro-oesophageal junction adenocarcinoma (RAINBOW): a double-blind, randomised phase 3 trial. Lancet Oncol. 2014;15(11):1224-1235. doi: 10.1016/S1470-2045(14)70420-6.
13. Kim SM, Park SH. Chemotherapy beyond second-line in advanced gastric cancer. World J Gastroenterol. 2015;21(29):8811-8816. doi: 10.3748/wjg.v21.i29.8811.
14. Cyramza [package insert]. Indianapolis, IN: Eli Lilly & Co; 2017.
15. Yuan M, Shi Z, Wang Z, et al. The significance of multi-line chemotherapy for advanced gastric cancer: a retrospective analysis. Mol Clin Oncol. 2017;6(4):606-612. doi: 10.3892/mco.2017.1163.
16. Garon EB, Ciuleanu TE, Arrieta O, et al. Ramucirumab plus docetaxel versus placebo plus docetaxel for second-line treatment of stage IV non-small-cell lung cancer after disease progression on platinum-based therapy (REVEL): a multicentre, double-blind, randomised phase 3 trial. Lancet. 2014;384(9944):665-673. doi: 10.1016/S0140-6736(14)60845-X.
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