Almost all my speaking is for nonprofit educational organizations like universities and hospitals. While I have a "financial relationship" with these entities, they are not generally considered "commercial interests." Compensation includes travel reimbursement and usually an honorarium.
I also receive royalties from Wolters Kluwer Health and from Wolters Kluwer Law & Business. These are peer-reviewed academic publications.
The primary source of compensation from commercial interests relates to expert witness work. See my expert witness page.
I also receive a small stipend from the ASCO Post for a regular column on law and ethics.