Investigational New Drugs. 2008 Jul 9. [Epub ahead of print] [Link]

Kindler HL, Burris HA 3rd, Sandler AB, Oliff IA.

University of Chicago, 5841 South Maryland Avenue, MC2115, Chicago, IL, 60637-1460, USA,


Objective: Methylthioadenosine phosphorylase (MTAP)–deficient tumors are dependent on the de novo purine synthesis pathway. These cancers are potential targets for selective chemotherapy with inhibitors of de novo adenine synthesis such as L-alanosine [L-2-amino-3-(N-hydroxy-N-nitrosamino) propionic acid]. This phase II study was designed to evaluate the efficacy and safety of L-alanosine in patients with MTAP-deficient solid tumors.

Methods: Patients with mesothelioma, non–small cell lung cancer (NSCLC), soft tissue sarcoma, osteosarcoma, or pancreatic cancer whose tumors were MTAP deficient by immunohistochemistry were eligible. Patients received L-alanosine at a starting dose of 80 mg/m2 by continuous intravenous infusion daily for 5 days every 21 days. Computed tomography scans or magnetic resonance imaging were performed every 3 cycles.

Results: 65 patients (16 mesothelioma, 13 NSCLC, 15 soft tissue sarcoma, 7 osteosarcoma, 14 pancreatic cancer) were enrolled at 19 centers; 55 were evaluable for response. There were no objective responses; 24% had s disease, including 2 patients with mesothelioma who had prolonged stable disease lasting 7.5 and 15.2 months, respectively. Grade 3/4 toxicities included mucositis 11%, fatigue 6%, nausea 3%, and renal failure 1.5%.

Conclusion: At this dose and schedule, L-alanosine was ineffective in patients with advanced MTAP-deficient tumors.

Keywords: L-alanosine – Methylthioadenosine phosphorylase – Mesothelioma – Mucositis