The American Diabetes Association...privately enlisted an Eli Lilly & Co. executive to chart its growth strategy. The National Alliance on Mental Illness...lobbies for treatment programs that also benefit its drug-company donors. The National Gaucher Foundation...gets nearly all its revenue from one drugmaker, Genzyme Corp. Many patient groups and drug companies maintain close, multimillion-dollar relationships while disclosing limited or no details about the ties. An Inquirer examination of six groups, each a leading advocate for patients in a disease area, found that the groups rarely disclose such ties when commenting or lobbying about donors' drugs. Combined, the six received at least $29 million from drug companies last year. The amount ranged from 2 percent to 7 percent of revenue at the Arthritis Foundation, to 89 percent to 91 percent at the much smaller National Gaucher Foundation. The funding usually comes from the companies' marketing or sales divisions, not charity offices. Grants often rise with promotional spending as a drug hits the market and fall when sales ebb. Donations from Merck and Pfizer Inc. to the Arthritis Foundation more than doubled, to at least $1.65 million combined, in 2000 as they launched Vioxx and Celebrex. Merck explicitly wove the foundation into sales strategies. In 2000-2001, the American Diabetes Association did not disclose an unusual gift from Lilly: a lent executive, Emerson Randy" Hall Jr., who moved into its Alexandria, Va., headquarters and coached it on growth strategies, all paid by Lilly.