The type dimension of the Attrition Cells market is organized around three principal cell origins: Immune‑derived Attrition Cells, Stem‑cell derived Attrition Cells, and Tumor‑derived Attrition Cells. Immune‑derived cells, primarily sourced from peripheral blood mononuclear cells, dominate the segment because they closely mimic physiological attrition pathways and are extensively used in immuno‑oncology studies. Stem‑cell derived attrition cells, generated from induced pluripotent stem cells, contribute a growing share as they enable scalable production and genetic manipulation, supporting high‑throughput screening. Tumor‑derived attrition cells, extracted directly from patient biopsies, represent a niche but critical segment for precision‑medicine applications, offering direct relevance to patient‑specific resistance mechanisms. Each type adds distinct value to the overall market size: immune‑derived cells anchor the bulk demand, stem‑cell derived cells drive incremental growth through automation and standardization, and tumor‑derived cells expand the market’s reach into personalized therapeutic development. Together, they form the backbone of the Attrition Cells segmentation, informing investment decisions and R&D prioritization across the sector.