Exhibit 10.21

 

November 11, 2020

 

Anthony Cataldo

GT Biopharma Inc.

9350 Wilshire Blvd., Suite 203

Beverly Hills, CA 990212

 

Mr. Cataldo:

 

This letter is my notice of resignation as the Chief Financial Officer and Director of GT Biopharma, Inc. effective immediately.

 

Sincerely,

 

/s/ Steven Weldon

Steven Weldon, MBA, CPA