The present invention relates to use of pyrimido-diazepinone compounds that are able to modulate protein kinases such as doublecortin-like kinase (DCLK1) and doublecortin-like kinase 2 (DCLK2), which are members of serine/threonine-protein kinase family and Ca2+/calmodulin-dependent protein kinase class of enzymes, and the use of such compounds in the treatment of various diseases, disorders or conditions.