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Oncology. 2016;90(5):239-47. doi: 10.1159/000443506. Epub 2016 Apr 6.

The Proportion of Signet Ring Cell Component in Patients with Localized Gastric Adenocarcinoma Correlates with the Degree of Response to Pre-Operative Chemoradiation.

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1
Department of Gastrointestinal Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Tex., USA.

Abstract

BACKGROUND:

Patients with localized gastric adenocarcinoma (LGAC), who get pre-operative therapy, have heterogeneous/unpredictable outcomes. Predictive clinical variables/biomarkers are not established.

METHODS:

We analyzed 107 LGAC patients who had chemoradiation and surgery. LGACs were grouped for (1) presence/absence of signet ring cell histology (SRC) and (2) histologic grade: G2 or G3. %SRC was assessed (0, 1-10, 11-49, and 50-100%) and correlated with pathologic complete response (pathCR) or <pathCR in the resected specimens.

RESULTS:

Most patients were men (60%), had stage cIII LGAC (50%), and received chemotherapy before chemoradiation (93%). Most had G3 tumors (78%) and SRC (58%). Presence of SRC was associated with a lower rate of pathCR (11 vs. 36%, p = 0.004), and the association remained significant even with a low percentage of SRC (1-10%; p = 0.014). The higher the fraction of SRC, the lower was the probability of pathCR (p = 0.03). G3 and SRC led to a shorter overall survival (OS) (p = 0.046 and p = 0.038, respectively). yp stage independently prognosticated OS and recurrence-free survival (p < 0.001).

CONCLUSION:

Our novel findings suggest that LGACs with SRC are relatively chemoradiation resistant compared to LGACs without SRC. A higher fraction of SRC is associated with higher resistance. Upon validation/biomarker(s) evaluation, reporting of the fraction of SRC may be warranted.

PMID:
27046280
PMCID:
PMC4870109
DOI:
10.1159/000443506
[Indexed for MEDLINE]
Free PMC Article

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