| abstract |
Provided herein are compounds of the Formula I: n nand stereoisomers and pharmaceutically acceptable salts or solvates thereof, in which A, B, X 1 , X 2 , X 3 , X 4 , Ring D, and E have the meanings given in the specification, which are inhibitors of RET kinase and are useful in the treatment and prevention of diseases which can be treated with a RET kinase inhibitor, including RET-associated diseases and disorders. |