Phase II study of the multitargeted antifolate LY231514 (ALIMTA, MTA, pemetrexed disodium) in patients with advanced

K D Miller1, J Picus, C Blanke

  • 1Indiana University, Indianapolis, Indiana, USA.

Abstract

Insights

Pemetrexed disodium (LY231514) showed minimal antitumor activity in advanced pancreatic cancer patients. While generally well-tolerated, further combination trials are planned for this chemotherapy-naïve group.

Area of Science:

  • Oncology
  • Clinical Pharmacology

Background:

  • Pancreatic cancer remains a significant challenge with limited treatment options.
  • Chemotherapy-naïve patients with advanced disease require novel therapeutic strategies.

Purpose of the Study:

  • To evaluate the safety and efficacy of pemetrexed disodium (LY231514) in patients with advanced pancreatic cancer who have not received prior chemotherapy.
  • To establish an appropriate dose and schedule for further investigation.

Main Methods:

  • A phase II clinical trial was conducted involving 42 chemotherapy-naïve patients with unresectable or metastatic pancreatic cancer.
  • Patients received LY231514 at a dose of 600 mg/m2 intravenously every three weeks.
  • Safety was assessed by monitoring adverse events, and efficacy was evaluated by objective response rate and disease stabilization.

Main Results:

  • The most common toxicity was neutropenia (40% grade 3 or higher), but infectious complications were infrequent. Other toxicities like anemia and thrombocytopenia were less than 20%.
  • Objective response rate was 5.7% (1 complete, 1 partial response) among 35 evaluable patients.
  • Median survival was 6.5 months, with 28% of patients alive at one year. 40% of patients experienced stable disease for at least 6 months.

Conclusions:

  • Pemetrexed disodium (LY231514) is a well-tolerated agent in this patient population.
  • The drug demonstrated minimal objective antitumor activity in advanced pancreatic cancer.
  • Further investigation in combination therapies is warranted and planned.