| Terminated | 2b | 52 | US, Canada, Europe | Pioglitazone hydrochloride, Actos, pioglitazone, placebo, PLCB, laboratory biomarker analysis | National Cancer Institute (NCI) | Oral Leukoplakia | 03/14 | 03/14 | | |
| Completed | 2 | 1 | US | Pioglitazone, Actos | University of Michigan, National Cancer Institute (NCI) | Thyroid Cancers That Contain the PAX8-PPARgamma Fusion Gene | 03/17 | 03/17 | | |