Gastric cancer molecular classification and adjuvant therapy: Is there a different benefit according to the subtype?

Abstract:

BACKGROUND:Gastric cancer (GC) has been defined in distinct molecular subtypes with different therapeutic implications. However, its clinical significance and prognosis regarding standard chemotherapy (CMT) remains unclear. This study aimed to analyze the impact of perioperative or adjuvant treatment among subtypes of GC. METHODS:We retrospectively evaluated all stage II/III patients with GC who underwent a curative gastrectomy. Based on immunohistochemistry and in situ hybridization techniques, GC was classified into five subtypes: Epstein-Barr virus (EBV) positive, microsatellite instability (MSI), e-cadherin aberrant, p53-aberrant, and p53-normal. RESULTS:Among the 178 CG included, 111 patients received CMT and 67 were treated with surgery alone. Survival analysis showed that p53-aberrant GC treated with CMT had better disease-free survival (DFS) compared with surgery alone (P = .001).There was no significant difference in DFS between patients who received CMT and those with surgery alone for EBV, MSI, E-cadherin, and p53-normal GC. An improvement in overall survival was observed only for E-cadherin (P = .001) and p53-aberrant (P < .001) patients who received CMT. CONCLUSIONS:CMT showed different impact on the survival of CG according to the molecular subtype. No survival benefit was observed for EBV and MSI groups who received CMT. GC with p53-aberrant had a significant benefit in survival with standard therapy.

journal_name

J Surg Oncol

authors

Ramos MFKP,Pereira MA,Amorim LC,de Mello ES,Faraj SF,Ribeiro U,Hoff PMG,Cecconello I,de Castria TB

doi

10.1002/jso.25792

subject

Has Abstract

pub_date

2020-04-01 00:00:00

pages

804-813

issue

5

eissn

0022-4790

issn

1096-9098

journal_volume

121

pub_type

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