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USE OF PALBOCICLIB IN REAL CLINICAL PRACTICE

European Statement

Clinical Pharmacy Services

Author(s)

SILVIA BOULLOSA LALE, Fernando Bustelo Paz, Claudia Barca Diez, María Francisca Fernández Ribeiro, Lara González Freire, Susana Castro Luaces, Irea Celtia Proupín Cantelar, Carlos Crespo Diz

Why was it done?

The aim of this study is to evaluate the use, duration and safety of palbociclib treatment in real clinical practice in our healthcare area.

What was done?

Palbociclib is a cyclin-dependent kinase 4/6 inhibitor indicated for the treatment of metastatic breast cancer(MBC).

How was it done?

Retrospective observational study. All patients treated with palbociclib between June 2016-March 2021 were included.
Data collection was carried out using the electronic medical record and the pharmacotherapeutic management software application.
The variables collected were: gender, age, metastases, initial date, first/second line of treatment, concomitant treatment, delay of treatment, reason for dose reduction and for discontinuation of treatment.
Neutropenia was assessed according to the Common Terminology Criteria for Adverse Events (CTCAE)4.0.

What has been achieved?

Data from 47 patients was collected, 100% were women. Median age: 60(33-85) years. 100% of patients were diagnosed with MBC:51.1%(24) visceral metastases.
Palbociclib was administered in 36.2%(17) of patients concomitantly with an aromatase inhibitor as first line of hormonal treatment for metastatic disease. 63.8%(30) of patients had already received prior hormonal therapy.
A first dose reduction was required in 42,5%(20) of patients, followed by a second reduction to 75 mg in 37.5%(6) of them. These reductions were due to grade 4 neutropenia in 19.2%(5) of patients and recurrent grade 3 in 80.8% (21). All neutropenias resolved after the respective reductions.
Treatment was definitively discontinued in 76.6%(36) of patients: 77.8% (28) due to progression; 13.9% (5) due to neutropenia; 5.5% (2) due to neutropenia and anaemia; and in 2.8%(1) of the patients the previous line of treatment was restarted for non-compliance.
Median overall progression free survival (PFS) was 11.23 months(CI95%:5.76-30.66).
Median PFS in the first-line treatment group was 30.66 months (CI95%:8.33-34.20). In second line it was 9.1 months(CI95%: 5.76-20.83). No statistically significant differences were shown (p=0.2).

What next?

The profile of palbociclib use in our area is predominant in second line treatment for MBC. The PFS achieved did not show any significant differences between second or first line.
The observed treatment duration was longer in patients who discontinued the treatment due to progression versus toxicity.
It is a safe drug: neutropenia, the most frequent cause of treatment reduction/discontinuation, is in all cases transient.

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