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OUTPATIENT ADMINISTRATION OF BLINATUMOMAB FOR ACUTE LYMPHOCYTYC LEUKEMIA

European Statement

Clinical Pharmacy Services

Author(s)

MV VILLACAÑAS PALOMARES, CM VALENCIA SOTO, A GARCIA-AVELLO FERNANDEZ-CUETO, M MARTIN LOPEZ, S BARBADILLO VILLANUEVA, M OCHAGAVIA SUFRATEGUI, V MARTINEZ CALLEJO, M RIOJA CARRERA, P DEL RIO ORTEGA, M VALERO DOMINGUEZ

Why was it done?

This drug is administered continuously during a 28 days infusion. Due to the risk of cytokine release syndrome (CRS) it is initially administered in the inpatient setting and then transitioned to the outpatient, requiring an important interdisciplinary coordination to optimize the process.
Home-based chemotherapy offers several potential benefits: reduced exposure to hospital infections, less disruption of routine and family life, lower health care cost, …

What was done?

Pharmacy and haematology services designed a workflow for the outpatient administration of blinatumomab, a bispecific T-cell engager approved for relapsed ALL.
Here, we describe our experience transitioning from inpatient to outpatient setting.

How was it done?

First step was to review blinatumomab stability, as well as material compatibility and transfer set necessaries for both hospital and domiciliary administration.
Reconstituted blinatumomab may be stored at refrigerated (2-8°C) for up to 24 hours. Prepared infusion bag (with preservative) may be stored at room temperature (up to 27°C) for up to 96 h and for up to 10 days refrigerated (2-8ºC).
Second step was to establish with the haematology service the patient´s scheduled visits to the hospital to ensure maximum stability of the blinatumomab preparation.
We decided to prepare the blinatumomab infusion bag every three- or four-days beginning on Monday, Thursday or Friday avoiding visits on weekends.
In order to take advantage of the rest of the vial, we diluted itn a new bag with stabilizer solution but without in-line filter for the next preparation. We noted the date of elaboration and the amount of medication remaining.
We used this preparation initial in each new visit add the dose necessary and an in-line filter. We primed the filter with the prepared solution for infusion

What has been achieved?

Out of the four patients who have received blinatumomab in our hospital(May 2020 – September 2021), three have benefited from this circuit.18 doses were administered at home, avoiding 68 days of hospital admission.

What next?

Outpatient administration could reduce health expenditure, therefore allowing for additional investments in new therapies.
Since the use of blinatumomab is not very common and there is not much evidence at this respect, our experience can help other Pharmacy Services to implement this circuit.

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