Application-based Bispecific Antibodies for Cancer segmentation distinguishes three clinically validated settings. Hematological malignancies remain the commercial anchor, commanding roughly two-thirds of 2023 global sales; CD3×CD20 and BCMA×CD3 constructs have converted relapsed/refractory leukemia or myeloma into chronic, pharmacy-dispensed diseases, creating recurring revenue streams that scale with each new line-of-therapy approval. Solid tumors currently contribute <20% of revenue, yet the addressable prevalence is an order of magnitude larger; developers are engineering T-cell engagers with conditional activation or 4-1BB costimulation to overcome antigen heterogeneity and suppressive stroma, so the segment's growth elasticity exceeds 25% CAGR and is expected to equal hematology share by 2030. Adjuvant/neoadjuvant applications remain exploratory, but checkpoint-cum-engager combinations in high-risk resectable cancers could extend treatment windows from weeks to months, adding incremental per-patient value that lifts the overall Bispecific Antibodies for Cancer market size even if penetration stays below 10%.