Hunzeker ZE, Bhakta P, Gudipally SR, Kavuri SB, Venkatesan R, Nwanze C. Complete Response of High Microsatellite Instability Gastric Cancer and Synchronous Microsatellite Stability Rectal Cancer.
Cureus 2022;
14:e25820. [PMID:
35836435 PMCID:
PMC9273196 DOI:
10.7759/cureus.25820]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/09/2022] [Indexed: 11/26/2022] Open
Abstract
Gastric cancer, a leading cause of cancer-related death in the world, may occur with an additional synchronous malignancy in rare cases. Of these rare cases many are colorectal cancer. Microsatellite instability is a phenomenon that may contribute to the pathogenesis of both cancers, as are field cancerization and genetic susceptibility, although none of these explain many concurrent cases. In this case, we described a patient with locally advanced microsatellite instability-high gastric cancer and synchronous microsatellite stable rectal cancer, who received a combination chemo-immunotherapy regimen and achieved complete response. This report reflects on current knowledge surrounding synchronous primary malignancies and achieving complete response.
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