Find your calling! Oncology Nurse Practitioner or Physician Assistant Opportunity in St. Louis, MO! Oncology and Hematology - Pratt Cancer Center is powered by 8 Physicians, 3 Advanced Practitioners, and an engaged support staff focused on quality patient care. Previous Advanced Practitioner Oncology experience is strongly preferred. This is a great opportunity to step into a collaborative, patient-centered practice with a strong referral base and excellent resources.