Prognostic value of MACC1 and proficient mismatch repair status for recurrence risk prediction in stage II colon cancer patients: the BIOGRID studies

Item Type:	Article
Title:	Prognostic value of MACC1 and proficient mismatch repair status for recurrence risk prediction in stage II colon cancer patients: the BIOGRID studies
Creators Name:	Rohr, U.P. and Herrmann, P. and Ilm, K. and Zhang, H. and Lohmann, S. and Reiser, A. and Muranyi, A. and Smith, J. and Burock, S. and Osterland, M. and Leith, K. and Singh, S. and Brunhoeber, P. and Bowermaster, R. and Tie, J. and Christie, M. and Wong, H.L. and Waring, P. and Shanmugam, K. and Gibbs, P. and Stein, U.
Abstract:	Background: We assessed the novel MACC1 gene to further stratify stage II colon cancer patients with proficient mismatch repair (pMMR). Patients and methods: Four cohorts with 596 patients were analyzed: Charite 1 discovery cohort was assayed for MACC1 mRNA expression and MMR in cryo-preserved tumors. Charite 2 comparison cohort was used to translate MACC1 qRT-PCR analyses to FFPE samples. In the BIOGRID 1 training cohort MACC1 mRNA levels were related to MACC1 protein levels from immunohistochemistry in FFPE sections; also analyzed for MMR. Chemotherapy-naive pMMR patients were stratified by MACC1 mRNA and protein expression to establish risk groups based on recurrence-free survival (RFS). Risk stratification from BIOGRID 1 was confirmed in the BIOGRID 2 validation cohort. Pooled BIOGRID datasets produced a best effect-size estimate. Results: In BIOGRID 1, using qRT-PCR and immunohistochemistry for MACC1 detection, pMMR/MACC1-low patients had a lower recurrence probability versus pMMR/MACC1-high patients (5-year RFS of 92% and 67% versus 100% and 68%, respectively). In BIOGRID 2, longer RFS was confirmed for pMMR/MACC1-low versus pMMR/MACC1-high patients (5-year RFS of 100% versus 90%, respectively). In the pooled dataset, 6.5% of patients were pMMR/MACC1-low with no disease recurrence, resulting in a 17% higher 5-year RFS (95% CI (12.6-21.3%)) versus pMMR/MACC1-high patients (P=0.037). Outcomes were similar for pMMR/MACC1-low and deficient MMR (dMMR) patients (5-year RFS of 100% and 96%, respectively). Conclusions: MACC1 E xpression stratifies colon cancer patients with unfavorable pMMR status. Stage II colon cancer patients with pMMR/MACC1-low tumors have a similar favorable prognosis to those with dMMR with potential implications for the role of adjuvant therapy.
Keywords:	Colon Cancer, Stage II, PMMR, MACC1, Survival Prognostication
Source:	Annals of Oncology
ISSN:	0923-7534
Publisher:	Oxford University Press
Volume:	28
Number:	8
Page Range:	1869-1875
Date:	1 August 2017
Official Publication:	https://doi.org/10.1093/annonc/mdx207
PubMed:	View item in PubMed

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