graph Evidence gap map comparisons
palbociclib based treatment
palbociclib palbociclib plus endocrine therapy palbociclib plus fulvestrant palbociclib plus letrozole
Comparator:  vs endocrine therapy;   vs capecitabine;   vs letrozole;   vs fulvestrant; 
Risk of bias:  low;   some concerns;   high;  NA;