Eric-
I disagree with your classifications. I have found that in Philadelphia all oncologists are listed as hematologist/oncologist unless s/he is an orthopedic oncologist. But, the orthopedic oncologist may be listed as a hematologist/oncologist with a specialty in orthopedic oncology.
I may be a bit confused about titles. I know at the hospital I get treated at, the section is "Hematology / Oncology and all the cancer patients are treated there. But I believe what I am seeing is there are hematologist / oncologist that that exclusively treat bone marrow and blood disorders such as leukemia, lymphoma, myeloma etc and not breast, lung and other cancers. And then a subset of that group specialize and focus on the treatment of myeloma and there are far less of them. None at the main hospital I get treated at but my SCT doctor has lot of myeloma patients and experience with all the other cancer disorders that SCT is used to treat.
Wikipedia says there are fewer than 200 orthopedic oncologists in the US. I have never seen one but when I was admitted to the hospital just after I was diagnosed with myeloma, I had a roommate who was being treated for bone tumor. It looked pretty rough and far tougher that the treatments for myeloma. Really heavy chemotherapy.
