Evaluating the potential benefit of adjuvant chemotherapy for small bowel adenocarcinoma

372 Background: Small bowel adenocarcinoma (SBA) is known as a poor prognostic cancer even in surgically resected cases. Its five-year survival rates were reported as 65%, 48%, and 35% in stage I, II, and III SBA, respectively. However, clinical outcomes of curatively resected SBA, especially without peri-operative adjuvant chemotherapy, are still unknown in Japanese population. Methods: We retrospectively reviewed medical records of patients who were diagnosed as Stage I, II, and III SBA after curative surgery between July 1994 and June 2014 at National Cancer Center Hospital. Overall survival (OS) and relapse-free survival (RFS) were calculated by Kaplan-Meier method. Cox proportional-hazards analysis was performed to identify the prognostic factors. Results: From a total of 76 patients with SBA received surgical resection, 56 were selected in this study who underwent curative resection with histological confirmation and did not receive adjuvant chemotherapy. The median age was 64 years (range: 20-85). Thirty-five patients (61%) were male. Forty-five patients (80%) had tumors in duodenum, 6 (11%) in jejunum and 5 (9%) in ileum. Pathological T stage were pT1a/T1b/T2/T3/T4 in 9/2/4/14/27 patients, and pathological N stage (pN) were pN0/N1/N2 in 29/16/11. The 1/3/5-year OS in all patients were 92.5/77.5/71.6%, and 1/3/5-year RFS were 76.5/68.9/61.6%. The 5-year RFS of pN0 (stage I/IIA/IIB) / N1 (stage IIIA) /N2 (stage IIIB) were 81.2/51.6/20.8%, and 5-year OS were 88.2/71.6/26.7%, respectively. Univariate analysis demonstrated that pN, presence of lymphatic and venous invasion were associated with poor OS. In multivariate analysis, pN was a significant predictor of poor OS (HR: 5.39 [N0 vs N1], 21.74 [N0 vs N2], 4.03 [N1 vs N2], p = 0.042). These findings were also seen in RFS. Conclusions: This study showed survival outcome of curatively resected SBA was better compared with previous reports, and pN was a significant prognostic factor of RFS and OS.

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Small bowel adenocarcinoma: revisited

International Surgery Journal ◽

10.18203/2349-2902.isj20210513 ◽

2021 ◽

Vol 8 (3) ◽

pp. 1010

Author(s):

Muhammad F. Rosley ◽

Mahanama Dissanayake

Keyword(s):

Adjuvant Chemotherapy ◽

Small Bowel ◽

Metabolic Response ◽

Advanced Disease ◽

Tumor Staging ◽

Delayed Diagnosis ◽

Small Bowel Resection ◽

Anatomical Location ◽

Small Bowel Adenocarcinoma ◽

Presenting Symptoms

Small bowel malignancies are rare despite it representing 75% of the gastro intestinal (GI) length and 90% of the mucosal surface area. Even then small bowel adenocarcinoma (SBA) accounts for only 30-40% of all small intestine malignancies. Etiology is multifactorial and risk factors include hereditary mutations, inflammatory bowel diseases, coeliac disease. Presenting symptoms are vague and nonspecific and cannot usually be diagnosed by conventional upper and lower GI endoscopy as it is in an inaccessible location. This leads to delayed diagnosis and hence poor prognosis. Mainstay of treatment is surgical resection with adjuvant chemotherapy in advanced disease. We present a case study of a 74 years old woman who presented to the emergency department with small bowel obstruction and radiological features suggestive of underlying small bowel malignancy. She underwent urgent laparotomy with segmental small bowel resection and had intraoperative evidence of wide spread metastasis which was confirmed on subsequent tumor staging scans. She received adjuvant chemotherapy with complete metabolic response at one year post resection. SBA is generally diagnosed at advanced stage due to its anatomical location. Complete surgical resections should always be targeted. However, adjuvant chemotherapy plays a role in advanced disease even though clinical data of evidence is scarce.

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Adjuvant chemotherapy impact on the overall survival of completely resected small bowel adenocarcinoma: An updated meta-analysis.

Journal of Clinical Oncology ◽

10.1200/jco.2020.38.15_suppl.e16806 ◽

2020 ◽

Vol 38 (15_suppl) ◽

pp. e16806-e16806

Author(s):

Philip A. Haddad ◽

Dalia A. Hammoud ◽

Kevin M. Gallagher

Keyword(s):

Overall Survival ◽

Adjuvant Chemotherapy ◽

Small Bowel ◽

Survival Benefit ◽

Randomized Clinical Trials ◽

Meta Analysis ◽

Adjuvant Chemoradiotherapy ◽

Small Bowel Adenocarcinoma ◽

The Impact ◽

Resected Small Bowel

e16806 Background: While the small intestine represents around 75% of the length and more than 90% of the gastrointestinal tract mucosal surface, it contributes around 2% of gastrointestinal tumors. Adenocarcinoma which constitutes 40% of all small bowel tumors is the most common histology. Complete surgical resection of early-stage small bowel adenocarcinoma (SBAC) is the only proven potentially curative therapy. Due to the rarity of this disease and the absence of randomized trials, the benefit of postoperative adjuvant chemotherapy (ACT) in patients with completely resected localized SBAC has been controversial. A meta-analysis conducted in 2018 found no survival benefit for adjuvant therapies in SBAC. However, this meta-analysis combined studies that used adjuvant chemotherapy and chemoradiotherapy and included studies contaminated by other less chemosensitive histologies and more advanced and sometimes metastatic disease. The purpose of this meta-analysis is to evaluate the impact of ACT on the overall survival (OS) of patients with completely resected SBAC incorporating more recent studies. Methods: A review of the medical literature was conducted using online databases. Inclusion criteria consisted of resected small bowel adenocarcinoma, English language, publications from 2000 to the present, and comparative studies reporting OS with hazard ratios (HR) or Kaplan-Meier curves of patients that underwent ACT versus those that did not. Adjuvant chemoradiotherapy studies and those that reported aggregate OS for a cohort with mixed histologies were excluded. A meta-analysis was conducted using an inverse variance method with a random-effects model. Results: Nine retrospective series which included 2082 patients were selected and analyzed. The majority of SBAC patients that received ACT belonged to stages II & III. ACT was found to be significantly associated with better OS in patients with completely resected SBAC (HR 0.66, 95%CI: 0.56-0.78, p < 0.001). Conclusions: This is the first meta-analysis to show that adjuvant chemotherapy is associated with a survival benefit in patients with completely resected small bowel adenocarcinoma. In the absence of randomized clinical trials, this meta-analysis represents the most compelling data supporting the use of ACT in this patient population.

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