One well known person that was agoraphobic was Sigmund Freud. Maybe there was no treatment available in his time, but there is agoraphobia treatment available today.
This disorder can be treated with medicine, and or exposure therapy.
I am not sure if it can be completely cured but it can certainly help, and help the person be functional again.
An interesting fact is that women are more likely to have this disorder, but men are more likely to get the treatment.