Real-life Treatment Patterns With Cyclin-dependent Kinase Inhibitors in Advanced Breast Cancer in Portugal - REVEAL Study

Primary outcomes

• Mean Age [Baseline, defined as start of treatment with CDKi]
• Number of Pre-menopause Patients by CDKi 4/6 [Baseline, defined as start of treatment with CDKi]: Menopausal status: if the patient had taken goserelin in the six months before or after starting CDKi, she was considered to be pre-menopausal. In patients without an associated goserelin withdrawal, age was taken into account, and patients aged 50 or over were considered post-menopausal.
• Number of Post-menopause Patients by CDKi 4/6 [Baseline, defined as start of treatment with CDKi]: Menopausal status: if the patient had taken goserelin in the six months before or after starting CDKi, she was considered to be pre-menopausal. In patients without an associated goserelin withdrawal, age was taken into account, and patients aged 50 or over were considered post-menopausal.
• Number of Patients Starting First-Line Therapy with CDKi 4/6 [Baseline, defined as start of treatment with CDKi]: Line of therapy: first-line therapy for advanced breast cancer was defined as no previous hormonal treatment in the 12 months prior to starting treatment with CDKi, including patients with concomitant treatment with fulvestrant. Second-line therapy was defined as previous hormonal treatment in the 12 months prior to starting treatment with CDKi.
• Number of Patients Starting Second-Line Therapy with CDKi 4/6 [Baseline, defined as start of treatment with CDKi]: Line of therapy: first-line therapy for advanced breast cancer was defined as no previous hormonal treatment in the 12 months prior to starting treatment with CDKi, including patients with concomitant treatment with fulvestrant. Second-line therapy was defined as previous hormonal treatment in the 12 months prior to starting treatment with CDKi.
• Initial Dose of CDKi 4/6 [Baseline, defined as start of treatment with CDKi]
• Number of Patients Administered Initial Dose of CDKi 4/6 Once per Day [Baseline, defined as start of treatment with CDKi]
• Number of Patients Without Concomitant Therapy [Baseline, defined as start of treatment with CDKi]
• Number of Palbociclib-treated Patients by Type of Concomitant Therapy [Baseline, defined as start of treatment with CDKi]
• Number of Ribociclib-treated Patients by Type of Concomitant Therapy [Baseline, defined as start of treatment with CDKi]
• Number of Palbociclib-treated Patients by Type of Aromatase Inhibitor [Baseline, defined as start of treatment with CDKi]
• Number of Ribociclib-treated Patients by Type of Aromatase Inhibitor [Baseline, defined as start of treatment with CDKi]
• Number of Pre-menopause Patients Without Concomitant Therapy [Baseline, defined as start of treatment with CDKi]: Menopausal status: if the patient had taken goserelin in the six months before or after starting CDKi, she was considered to be pre-menopausal. In patients without an associated goserelin withdrawal, age was taken into account, and patients aged 50 or over were considered post-menopausal.
• Number of Post-menopause Patients Without Concomitant Therapy [Baseline, defined as start of treatment with CDKi]: Menopausal status: if the patient had taken goserelin in the six months before or after starting CDKi, she was considered to be pre-menopausal. In patients without an associated goserelin withdrawal, age was taken into account, and patients aged 50 or over were considered post-menopausal.
• Number of Pre-menopause, Palbociclib-treated Patients by Type of Concomitant Therapy [Baseline, defined as start of treatment with CDKi]: Menopausal status: if the patient had taken goserelin in the six months before or after starting CDKi, she was considered to be pre-menopausal. In patients without an associated goserelin withdrawal, age was taken into account, and patients aged 50 or over were considered post-menopausal.
• Number of Pre-menopause, Ribociclib-treated Patients by Type of Concomitant Therapy [Baseline, defined as start of treatment with CDKi]: Menopausal status: if the patient had taken goserelin in the six months before or after starting CDKi, she was considered to be pre-menopausal. In patients without an associated goserelin withdrawal, age was taken into account, and patients aged 50 or over were considered post-menopausal.
• Number of Post-menopause, Palbociclib-treated Patients by Type of Concomitant Therapy [Baseline, defined as start of treatment with CDKi]: Menopausal status: if the patient had taken goserelin in the six months before or after starting CDKi, she was considered to be pre-menopausal. In patients without an associated goserelin withdrawal, age was taken into account, and patients aged 50 or over were considered post-menopausal.
• Number of Post-menopause, Ribociclib-treated Patients by Type of Concomitant Therapy [Baseline, defined as start of treatment with CDKi]: Menopausal status: if the patient had taken goserelin in the six months before or after starting CDKi, she was considered to be pre-menopausal. In patients without an associated goserelin withdrawal, age was taken into account, and patients aged 50 or over were considered post-menopausal.
• Number of Pre-menopause, Palbociclib-treated Patients by Type of Aromatase Inhibitor [Baseline, defined as start of treatment with CDKi]: Menopausal status: if the patient had taken goserelin in the six months before or after starting CDKi, she was considered to be pre-menopausal. In patients without an associated goserelin withdrawal, age was taken into account, and patients aged 50 or over were considered post-menopausal.
• Number of Pre-menopause, Ribociclib-treated Patients by Type of Aromatase Inhibitor [Baseline, defined as start of treatment with CDKi]: Menopausal status: if the patient had taken goserelin in the six months before or after starting CDKi, she was considered to be pre-menopausal. In patients without an associated goserelin withdrawal, age was taken into account, and patients aged 50 or over were considered post-menopausal.
• Number of Post-menopause, Palbociclib-treated Patients by Type of Aromatase Inhibitor [Baseline, defined as start of treatment with CDKi]: Menopausal status: if the patient had taken goserelin in the six months before or after starting CDKi, she was considered to be pre-menopausal. In patients without an associated goserelin withdrawal, age was taken into account, and patients aged 50 or over were considered post-menopausal.
• Number of Post-menopause, Ribociclib-treated Patients by Type of Aromatase Inhibitor [Baseline, defined as start of treatment with CDKi]: Menopausal status: if the patient had taken goserelin in the six months before or after starting CDKi, she was considered to be pre-menopausal. In patients without an associated goserelin withdrawal, age was taken into account, and patients aged 50 or over were considered post-menopausal.

Secondary outcomes

• Number of Patients with at Least One Dose Change [Up to 6 months post-initiation of CDKi treatment]
• Average Number of Dose Changes Per Patient [Up to 6 months post-initiation of CDKi treatment]
• Number of Palbociclib-treated Patients by Number of Dose Changes [Up to 6 months post-initiation of CDKi treatment]
• Number of Ribociclib-treated Patients by Number of Dose Changes [Up to 6 months post-initiation of CDKi treatment]

Sex: Female, ages: 18 Years to any

Inclusion Criteria:

* Female.
* Aged 18 years or older at the time of starting therapy with CDKi 4/6.
* Breast cancer diagnosis.
* At least one record of ribociclib or palbociclib donation during the identification period.
* Registration of the first supply of ribociclib or palbociclib between 1 March 2019 and 31 December 2019.

Exclusion Criteria:

* Patients with missing information regarding their date of birth and the date or quantity of the drug dispensed in any assignment were excluded.

• Novartis Pharmaceuticals, Study director, Novartis Pharmaceuticals