Somewhat surprisingly, both of the SXs, however, contained cells that expressed human CD3 and CD8 and were most likely residual human T cells that had been co-injected with the tumor cell inoculum, persisted in the SXs, and infiltrated the xenografts more extensively than TIL from the PHT (Figures 1 and Fig S3, and data not shown). Here, CD8A is linked to neoplasm.