Statement: the primary trial and the secondary trial have a different number of cohorts.
Primary_evidence: INTERVENTION 1:    Multicomponent Intervention   1.) A one-page paper-pencil agenda setting checklist completed immediately before a regularly scheduled medical oncology visit to elicit and align patient and companion perspectives regarding issues to discuss with the provider, and to stimulate discussion about the role of the companion in the visit, 2.) facilitated registration for the patient portal (for patient and family member, as desired by the patient), and 3.) education (as relevant) on access to doctor's electronic visit notes. INTERVENTION 2:    Usual Care   Care as usual with the medical oncologist.
Secondary_evidence: INTERVENTION 1:    Palbociclib+Letrozole India Cohort   Participants received Palbociclib orally once a day at 125 mg for 21 days followed by 7 days off treatment ofr each 28-day cycle. Participants received Letrozole orally at 2.5 mg once daily as continuous daily dosing schedule according to product labeling and in compliance with its local prescribing information INTERVENTION 2:    Palbociclib+Letrozole Australia Cohort   Participants received Palbociclib orally once a day at 125 mg for 21 days followed by 7 days off treatment for each 28-day cycle. Participants received Letrozole orally at 2.5 mg once daily as continuous daily dosing schedule according to product labeling and in compliance with its local prescribing information