Advanced T and N stages significantly worsen survival in stage IV colorectal cancer, highlighting the need for careful patient stratification.

• 5-year cancer-specific survival (CSS) is just 20.7%, dropping to 17.4% for T4 and 14.5% for N2.
• Higher T and N stages independently increase mortality risk, with T4 (HR: 1.33) and N1/N2 (HR: 1.27 and 1.59) dramatically affecting outcomes.

Surgical resection of metastases and systemic therapy can improve CSS by over 50%, indicating potential for tailored treatment strategies.

• Other factors include older age, male sex, and specific cancer histologies linked to worse CSS.