Do oncologists also see patients with rare blood disorders, or do they only see cancer patients?

Heme-Onc: Many hematologists (specialists in unusual blood disorders) are also oncologists, and vice-versa.

Hematologists 4blood: Medical oncologists are trained and board certified for hematology and oncology, specifically the practice of treating cancers with chemotherapy. However once in practice some focus on hematology while others focus on oncology or even specific diseases within oncology. Even moreso, some practice both.