On April 30, 2015 Starpharma Holdings Ltd (ASX: SPL, OTCQX: SPHRY) reported an update to the progress of its phase 1 clinical trial of DEP docetaxel for advanced solid cancers (Press release, Starpharma, APR 30, 2015, View Source [SID:1234506578]). The DEP docetaxel dose level now exceeds the most commonly used dose for Taxotere of 75mg/m2, with no dose limiting toxicities (DLT), including neutropenia, having been observed to date.

Approximately 50% of the anticipated number of patients have been recruited into the study and dosed with DEP docetaxel. Several patients have received multiple (up to 6) cycles of DEP docetaxel.

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Available data show that DEP docetaxel has been very well-tolerated, with no observations of neutropenia to date. According to the available product information for Taxotere (currently marketed docetaxel formulation), neutropenia occurs in virtually all patients given 60mg/m2 to 100mg/m2 of Taxotere, and the most severe (grade 4) neutropenia occurs in 75% of patients given 60mg/m2 of the product. The clinical data for DEP docetaxel are in line with preclinical studies in animals that showed that DEP docetaxel eliminated the neutropenia seen with equivalent doses of docetaxel alone whilst enhancing anticancer efficacy.

There have also been no reports in the trial of vomiting or hair loss related to the DEP docetaxel treatment. By comparison these events occur in a significant proportion of patients receiving Taxotere as monotherapy.

In contrast to therapy with Taxotere, which is formulated in polysorbate-80, a detergent that can cause significant hypersensitivity reactions, patients receiving DEP docetaxel therapy do not need to receive pre-treatment with corticosteroids (cortisone) because DEP docetaxel is detergent free. Additionally, patients receiving DEP docetaxel therapy have not required prophylactic treatment with anti-emetics (to stop nausea/vomiting).

Available pharmacokinetic data show, as previously reported, that DEP docetaxel also has the benefits of longer half-life and reduced peak concentrations of docetaxel compared to when the drug is given in its native form.

Starpharma CEO, Dr Jackie Fairley, commented: "We are very pleased that the study is progressing so well. The fact that a number of patients have exhibited potential anti-cancer activity, across a range of tumor types, despite the absence of dose limiting toxicities (DLTs) and the maximum tolerated dose (MTD) for DEP docetaxel not yet being reached, is very encouraging."

Taxotere is approved for treatment of breast cancer, non-small cell lung cancer, prostate cancer, gastric cancer and head and neck cancer. Patients with a range of advanced solid tumour types are enrolled in the current study. The study is being conducted across four Australian sites – Nucleus Network/Alfred Hospital, Austin Health/Olivia Newton John Cancer Centre, Liverpool Hospital and Royal Brisbane & Women’s Hospital.