What chemotherapy regimen would you give for metastatic adenocarcinoma that arose from teratoma/germ cell tumor?

Teratoma is pluripotential tissue that can de-differentiate along mesodermal, ectodermal or endodermal elements, and this case endodermal to "adenoCA" However, very rare to have late relapse 30 years later. If lesions in same loci as 30 years ago, compelling case for very late relapse. To be honest,...