Both Oncaspar and dexamethasone have been used together to treat ALL and ENKTL, which is another subtype of T cell lymphoma. The combination may provide a collaborative attack against the cancer cell; moreover, the dexamethasone could also prevent some of the side effects of Oncaspar; especially allergic reactions. This study will test these two drugs together to determine if they are an effective treatment for T-Cell Lymphoma. Each drug is commercially available to the drug market.