Review Article

CpG Island Methylation, Microsatellite Instability, and BRAF Mutations and Their Clinical Application in the Treatment of Colon Cancer

Table 1

Retrospective studies of randomized control trials that examined efficacy of adjuvant 5FU chemotherapy in patients with MSI versus MSS colon cancers.

Reference No. of patients Stage MSI(%)Adjuvant treatmentOutcome
BetterWorse

[9]#570II/III17No treatmentMSIMSS
5FU or 5FU/levamisoleMSS, more benefit from therapyMSI
[25]542II/III18No treatmentMSI = MSS
5FUMSI = MSS
[11]792III135FUMSI = MSS
5FU + irinotecanMSI, trend for better outcome than 5FU aloneMSS
[12]1,327II/III145FUMSIMSS
5FU + irinotecanNo added benefit with irinotecan
[10]#1027II/III16No treatmentMSIMSS
5FU or 5FU/levimisoleMSS and Stage III—benefit with treatmentMSI and stage II-no benefit with treatment
[26]#2141II/III16No treatmentMSIMSS
5FU-based therapy  MSI and stage III-benefit with treatment*

5FU = 5FU + leucovorin
#Data pooled from overlapping trials.
5FU in addition to: levamisole, portal venous 5FU, interferon-gamma, immunotherapy, vincristine, or semustine.
*Most treatment benefit was in patients with MSI tumors due to germ line mutations.