11/20/2012 02:35 pm ET Updated Nov 27, 2012

Robin Roberts: My Journey Has Been Like A 'Zig-Zag' (VIDEO)

“Good Morning America’s” Robin Roberts is staying strong and positive during the halfway point in her treatment for a rare blood and bone marrow disorder, MDS.

She spoke out in an interview with her sister Sally-Ann, who is also her donor. Roberts explains her journey as a zig-zag, but says she feels stronger everyday. KHOU reports Roberts woke up one day and just knew the transplant was working. Family, co-workers and fans have been tweeting their support as well.

Check out Robin Roberts interview in the clip above.

Robin Roberts Photos