Intravenous adoptively transferred PTEN^Δ/Δ NK cells are unable to migrate to peritoneal lymphoma. Control or PTEN^Δ/Δ NK cells were i.v. transferred with RMA/S challenge i.p. into RAG2^-/-γ_c^-/- hosts. Peritoneal exudate cells (PECs) were isolated after 48 hours.