Scope: colon cancer. Systemic (drug) therapy is shared with rectal cancer, so FDA/EMA labels, trials, and NCCN regimens below are written for metastatic colorectal cancer (mCRC). Biomarker testing (RAS, BRAF V600E, MMR/MSI, HER2, KRAS G12C) is the first branch point and drives most of the timeline.
Key FDA–EMA divergences flagged in the data: Anti‑EGFR antibodies (cetuximab, panitumumab) benefit RAS wild‑type tumours only and can harm RAS‑mutant patients (PRIME). Several US biomarker approvals have no matching EMA colorectal indication — tucatinib+trastuzumab, nivolumab (± ipilimumab), and the KRAS G12C combinations. Trastuzumab deruxtecan reaches colorectal use via a tissue‑agnostic HER2 IHC3+ approval (Apr 2024), not a CRC‑specific label.
Not medical advice. Indication wording is summarised; consult current prescribing information and protocols. A few 2024–2025 items rest on accelerated approvals with confirmatory trials still maturing (e.g. KRYSTAL‑10, BREAKWATER), and NCCN version/date should be re‑checked live.
NCCN layer. Category-of-evidence and preference-tier labels are summarised from the
NCCN Guidelines for Colon Cancer, Version 2.2026 and attributed to NCCN — not a reproduction of the guideline. NCCN updates several times yearly; verify the live version at
nccn.org.