I'm loud and I speak my mind,' he said.
The run was extended originally from its 24-week engagement.
He received an nomination for Best Actor in a Musical.
In his autobiography Not My Father's Son, Cumming describes the emotional and physical violence his father inflicted on him in his childhood.
He has a brother, Tom, who is six years older, and a niece and two nephews.
Cumming has stated that since 2012 he has maintained a lifestyle.