H.R.6725: To establish budget neutral demonstration projects to study and improve the quality and cost effectiveness of cancer care services provided to Medicare beneficiaries.

Oncology Quality Care Improvement Act of 2008 - Directs the Secretary of Health and Human Services to establish budget neutral demonstration projects to test and evaluate methods that: (1) improve the quality of care provided to eligible beneficiaries with certain cancer diagnoses; and (2) reduce expenditures that would otherwise be made under the Medicare program on behalf of such individuals for such diagnoses.

Authorizes the participation of oncology care groups of physicians, or of physicians and oncology nurse practitioners, in such demonstration projects, subject to certain conditions.