Hexafil: Individualized or guideline-concordant G-CSF usage—Is there a bridge?
e20563 Background: G-CSF is frequently used to prevent/treat chemotherapy (CT)-induced neutropenia (CIN) in cancer patients. The non-interventional observational study HEXAFIL on the use of biosimilar filgrastim (EP-2006) was conducted to provide further insight into G-CSF usage with respect to guidelines (EORTC, ASCO) in Germany. Methods: Patients who signed informed consents were enrolled. Data were documented for up to 3 consecutive G-CSF-supported CT-cycles. Rates of modified CT-treatments (dose modification/discontinuation of drug) were calculated by the number and percentage of patients affected; data presented are based on the first CT-cycle. In/Exclusion criteria: www.germanctr.de . Results: A total of 709 breast cancer patients were included in this interim analysis (9/2012). Only 2.0% of all patients experienced febrile neutropenia (FN) and 8.7% neutropenic complications. A majority of patients received primary (49.4%, PP) or secondary prophylaxis (33.6%, SP) with the biosimilar G-CSF. However, 17.1% were treated interventional (TX). Median G-CSF treatment duration was 4d with median start on day 6 after CT. Of all documented patients, 96.3% received CT without modifications; in 3.0% of the patients dose of CT was modified and in 0.8% CT drug was discontinued. To investigate potential effects of guideline-concordant G-CSF treatment the following populations were selected: patients with FN-risk > 20% and (1) G-CSF initiation < day 5 after CT (ie, “guideline-concordant” GL; N=104) or (2) G-CSF initiation starting > day 6 after CT (ie, “individualized” IND; N=169). As expected, IND-patients experienced FN twice as often as GL-patients (4.1% vs 1.9%). Moreover, CT treatment had to be modified in 6.5% of IND-patients compared with only 1.0% of GL-patients. Conclusions: A total of 96.3% of all analyzed patients receiving biosimilar G-CSF-supported CT-cycles had no modification to their CT-regimen. Data indicate that IND-patients showed a higher rate of CT disturbances/FNs and, as a consequence, should “cross the bridge” to potentially benefit from guideline-concordant treatment. However, further data are required to detail the impact of individualized G-CSF treatment. Clinical trial information: DRKS00000313.