Impact of S-1 plus Cisplatin Neoadjuvant Chemotherapy on Scirrhous Gastric Cancer

Multidisciplinary therapy for scirrhous gastric cancer: a retrospective analysis and proposal of new treatment strategy

Background

Scirrhous gastric cancer (SGC) is highly invasive and metastatic because of its interactions with stromal cells, such as fibroblasts and macrophages, and extracellular matrix, leading to a higher incidence of peritoneal metastasis (PM) than other gastric cancers (GCs). Taxane-based intraperitoneal chemotherapy (IPC) is a promising therapy for PM. We retrospectively analyzed outcomes of multidisciplinary therapies that included IPC for SGC.

Patients and therapy

Of 1,679 GC patients treated between 1990 and 2012, we analyzed 119 patients who underwent multidisciplinary therapy for SGC. Patients without PM received gastrectomy with lymphadenectomy and resection of involved adjacent organs followed by intraoperative IPC using cisplatin. Patients with PM received chemotherapy using fluorouracil, with or without methotrexate plus IPC using cisplatin before 2000, and S-1 plus IPC using paclitaxel or docetaxel since 2000.

Results

Of the 119 patients, 73 (61%) had PM and 63 (53%) had positive peritoneal lavage cytology. Of the 89 gastrectomy patients, 30 (34%) had macroscopic residual tumors (R2). Of the patients treated since 2000, 66 (100%) received S-1 plus taxanes and 44 patients (67%) received taxane-based IPC. Median survival time was significantly longer in the post-2000 group (22.8 months) than in the pre-2000 group (9.5 months). In univariate analysis, lavage cytology, PM, taxane-based IPC, gastrectomy, and R2 resection were significant prognostic factors. However, only R2 resection was an independent prognostic factor in multivariate analysis (hazard ratio: 5.53, 95% CI: 2.05–14.93).

Conclusion

As use of taxane-based IPC is not an independent prognostic factor, new multidisciplinary therapies are necessary to avoid R2 resections.

Neoadjuvant treatment with cisplatin and S-1 in elderly patients with oesophagogastric adenocarcinoma and locoregional disease: Two case reports and review of the literature

Perioperative platinum/fluoropyrimidine-based chemotherapy is the therapeutic standard for oesophagogastric cancer (OAC) patients with locoregional disease. The preoperative condition directly affects postoperative prognosis; thus, particularly for elderly patients, a perioperative regimen with a favourable side effect profile is highly desirable. In the palliative setting, the combination of cisplatin and S-1 (Cis/S-1) was found to be as effective as cisplatin/5-fluorouracil, but with a more favourable side effect profile. However, no data on this combination have been reported in the perioperative setting in Caucasian patients. To the best of our knowledge, this is the first report on the treatment outcome of two elderly Caucasian OAC patients with locoregional disease receiving two neoadjuvant 4-week cycles of intravenous Cis/S-1. Both patients tolerated the doublet therapy well. No treatment delay or dose reduction was required. In both cases, preoperative staging revealed a clear response and complete surgical resection could be performed without any complications.