Risk management in the dual crisis of unresectable colorectal cancer and deep vein thrombosis: navigating between hemorrhage and antithrombosis.

Patients with advanced, unresectable colorectal cancer in need of anticoagulation for deep vein thrombosis (DVT) with active or high-risk gastrointestinal bleeding (GIB) have a critical dilemma. Withholding anticoagulation has a risk of fatal thrombosis, while giving anticoagulation makes life-threatening bleeding worse. A retrievable inferior vena cava (IVC) filter may be a temporary stopgap while an active GIB is occurring. Once hemostasis has occurred, therapeutic anticoagulation should begin. Low molecular weight heparin (LMWH) is preferred over direct oral anticoagulants (DOAs) because of a lower risk of mucosal bleeding, and if necessary, apixaban is suggested. Dosing must be adjusted for thrombocytopenia. Management requires meticulous and individualized risk assessment. Future priorities include improved risk-prediction tools and targeted therapies to mitigate this precarious "therapeutic tightrope."