Piedmont Cancer Institute | Atlanta Oncologists. ATLANTA: 1800 Howell Mill Rd • Suite 800 • Atlanta, GA 30318 • 404-350-9853. FAYETTEVILLE: 1267 Highway 54 West • Suite 4200 • Fayetteville, GA 30214 • 678-829-1060. NEWNAN: 775 Poplar Rd. • Suite 310 • Newnan, GA 30265 • 770-251-2590..