SAKK57/16 Nab-paclitaxel and Gemcitabine in Soft Tissue Sarcoma (NAPAGE): a phase I/II trial.

Digklia, A; Kollár, A; Dietrich, D; Kronig, M N; Britschgi, C; Rordorf, T; Joerger, M; Krasniqi, F; Metaxas, Y; Colombo, I; Ribi, K; Rothermundt, C (2024). SAKK57/16 Nab-paclitaxel and Gemcitabine in Soft Tissue Sarcoma (NAPAGE): a phase I/II trial. European journal of cancer, 197(113470), p. 113470. Elsevier 10.1016/j.ejca.2023.113470

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BACKGROUND

To determine whether the combination of nab-paclitaxel with gemcitabine has activity in patients with pretreated soft tissue sarcoma (STS).

PATIENTS AND METHODS

NAPAGE is a phase Ib/II clinical trial investigating the combination of nab-paclitaxel (nab-pc) with gemcitabine employing two cohorts. One of a dose-de-escalation phase and one of expansion. In phase I, nab-pc was given at 150 mg/m2 in combination with gemcitabine 1000 mg/m2 every two weeks, until disease progression or unacceptable toxicity. This dose was recommended for phase II (RP2D), as there was no dose limiting toxicity (DLT) or discontinuations due to adverse events (AEs). The primary endpoint of the phase II was progression-free rate (PFR) at 3 months (H0: 20%, H1:40%). The secondary endpoints included progression free survival (PFS), overall survival (OS), AEs, objective response and patient-reported outcomes (PRO). Efficacy analysis was by intention to treat.

RESULTS

The 3-month PFR was 56.4% (95% confidence interval CI: 39.6-72.2%). The 3-month and 6-month PFS were 58.4% (95% CI: 41.3-72.1%) and 44.6% (95% CI: 28.4-59.5%), respectively. Median PFS was 5.3 months (95% CI: 1.4-8.2) and median OS was 12.8 months (95% CI: 10.5-39.2). The most common treatment-related grade ≥ 3 AE were neutropenia (18%), followed by anemia (2.6%), hypertension (2.6%) and alanine aminotransferase increase (2.6%). Grade 1 and grade 2 peripheral sensory neuropathy (PNP) occurred in 15.4% and 20.5%, respectively. No grade 3-4 PNP was reported.

CONCLUSIONS

Combining nab-pc and gemcitabine is safe. Promising activity is observed in pretreated STS patients with manageable toxicity. This regimen should be considered for further exploration.

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