"Hi, i am trying to find out if the dosage of Keytruda is 200 mg for everyone or after the regression patients can take half dose (100mg) . Keytruda web site also says that take it up to 24 months without disease progression. Does it mean that if there is no progression for 2 years, stop taking it? Any advice related to keytruda maintenance plan would be great. Insurance does not cover the expenses on Keytruda in Georgia and its getting harder for my dad. Thanks "