Study of Pralatrexate in Patients With Relapsed or Refractory Cutaneous T-cell Lymphoma

"1 mg intramuscular injection~Administered at least 10 days prior to start of pralatrexate if patient has elevated methylmalonic acid (MMA) and/or homocysteine(Hcy) levels.~Administered every 8-10 weeks throughout the study and for at least 30 days after last dose of pralatrexate."

"1 mg orally~Administered at least 10 days prior to start of pralatrexate if patient has elevated methylmalonic acid (MMA) and/or homocysteine(Hcy) levels.~Administered daily throughout the study and for at least 30 days after last dose of pralatrexate."

Intravenous (IV) push over 3-5 minutes into a patent IV line containing normal saline (0.9% sodium chloride). Pralatrexate will be administered via intravenous (IV) push over 3-5 minutes. The frequency of pralatrexate will be administered weekly for 3 or