8 Background: The rising cost of cancer drugs may make treatment unaffordable for some patients. Patients often rely on drug manufacturer-administered Pharmaceutical Assistance Programs (PAPs) to obtain drugs at reduced or no cost. The overall impact of PAPs on cancer care delivery is unknown. Methods: We identified all patients obtaining cancer drugs across an academically affiliated, integrated health system in the state of North Carolina during 2014. The proportion of patients receiving PAP assistance, and the retail value of the assistance, were quantified for each oncology drug. Cancer drugs were analyzed with respect to route of administration. Results: 215 unique patients submitted a total of 478 successful PAP requests for cancer drugs. The majority of the retail value of drugs obtained was for oral cancer drugs, particularly targeted therapies including tyrosine kinase inhibitors. Among all cancer patients who received medical treatment, 5.5% required PAP assistance, whereas 10.6% receiving an oral agent required PAP assistance (Table). The proportion receiving PAP assistance varied substantially by drug, ranging from <1% of patients (e.g., carboplatin, methotrexate) to 50% of patients (e.g., ponatinib, temsirolimus). Patients obtained a total of $1,556,575 of imatinib and $1,449,633 of dasatinib, which were the two drugs with the highest aggregate retail value. 40% of PAP-utilizing patients were uninsured, 26% had Medicaid coverage, 20% had Medicare coverage, and 14% were commercially insured. Conclusions: A substantial proportion of patients with cancer receive private charitable assistance through PAPs in order to obtain standard-of-care treatments. In particular, a disproportionate share of patients treated with orally-available cancer drugs require PAP assistance. This includes patients with federal and private insurance, suggesting an inability of patients to meet cost-sharing requirements. [Table: see text]