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CRYSTAL

Cetuximab and Chemotherapy as Initial Treatment for Metastatic Colorectal Cancer | NEJM

There was a significant interaction between treatment group and KRAS mutation status for tumor response (P=0.03) but not for progression-free survival (P=0.07) or overall survival (P=0.44). The hazard ratio for progression-free survival among patients with wild-type-KRAS tumors was 0.68 (95% CI, 0.50 to 0.94), in favor of the cetuximab-FOLFIRI group. The following grade 3 or 4 adverse events were more frequent with cetuximab plus FOLFIRI than with FOLFIRI alone: skin reactions (which were grade 3 only) (in 19.7% vs. 0.2% of patients, P<0.001), infusion-related reactions (in 2.5% vs. 0%, P<0.001), and diarrhea (in 15.7% vs. 10.5%, P=0.008).

  1. Design: Randomized controlled trial.
  2. Number of patients: Not reported.
  3. Patients characteristics: Patients with metastatic colorectal cancer.
  4. Agent: Cetuximab plus FOLFIRI or FOLFIRI alone.
  5. Treatment line: 1L
OutcomeCetuximab plus FOLFIRIFOLFIRI aloneHazard Ratio/Relative Risk (95% CI)P-value
Tumor responseNot reportedNot reportedNot reported0.03
Progression-free survivalImproved compared to FOLFIRI alone in wild-type-KRAS tumorsNot reported0.68 (0.50-0.94)0.07
Overall survivalNot different between the two groupsNot reportedNot reported0.44

Adverse events:

Adverse EventCetuximab plus FOLFIRIFOLFIRI aloneP-value
Skin reactions (grade 3 only)19.7%0.2%<0.001
Infusion-related reactions2.5%0%<0.001
Diarrhea15.7%10.5%0.008