Application-level market taxonomy splits into metastatic colorectal cancer (mCRC) and gastric adenocarcinoma, with mCRC contributing the larger patient pool and the longer mean treatment duration (3.8 cycles vs 2.9). Within mCRC, refractory RAS-mutant cases account for 62 % of prescriptions, reflecting post-REGTIDE trial adoption; microsatellite-stable phenotypes add another 23 %, while the remainder is off-label salvage. Gastric use is concentrated in Japan and South Korea where regulatory approval preceded global uptake by 18 months; here, HER2-negative third-line patients generate 70 % of gastric volumes, amplified by national reimbursement caps that favour oral fluoropyrimidine combinations. Cross-elasticity with bevacizumab and PD-1 regimens is low (<0.1), so demand is driven primarily by progression-free survival differentials rather than competitive pricing, allowing the Trifluridine and Tipiracil Tablet segment to expand in parallel to immunotherapy rather than be cannibalised by it.