CD1D and neoplasm: To address this, we compared tumor growth and metastasis rates of TM40D (CD1d-hi) or TM40D-MB (CD1d-lo) cells implanted in wildtype mice, CD1d KO mice that are deficient in all CD1d-restricted NKT cells, and Jα18 KO mice that are deficient in only type I NKT (iNKT) cells [30], [32].