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

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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., Herrmann, P., Ilm, K., Zhang, H., Lohmann, S., Reiser, A., Muranyi, A., Smith, J., Burock, S., Osterland, M., Leith, K., Singh, S., Brunhoeber, P., Bowermaster, R., Tie, J., Christie, M., Wong, H.L., Waring, P., Shanmugam, K., 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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