PT - JOURNAL ARTICLE AU - El-Haddad, Ghassan AU - Lim, Remy AU - Fegan, Jessica AU - Chandrashekar, Rudresh TI - Stability matters: Radiochemical stability of therapeutic radiopharmaceutical of <sup>177</sup>Lu-PSMA-I&amp;T AID - 10.2967/jnmt.121.262423 DP - 2022 Jun 01 TA - Journal of Nuclear Medicine Technology PG - jnmt.121.262423 4099 - http://tech.snmjournals.org/content/early/2022/06/14/jnmt.121.262423.short 4100 - http://tech.snmjournals.org/content/early/2022/06/14/jnmt.121.262423.full AB - Labelling radiopharmaceuticals and testing the quality of the labelled product before injecting it into patients are standard operating procedures in the Nuclear Medicine department. There is a different shelf life for each labelled product, which determines how long a product can maintain in-vitro stability before it needs to be discarded. Lutetium-177 (177Lu) is a radioactive isotope that is increasingly being accepted into the treatment paradigm for palliation of advanced-stage tumours, including metastatic castration-resistant prostate cancer (mCRPC) and neuroendocrine tumours (NET). In our institution, synthesis of 177Lu with prostate-specific membrane antigen imaging and therapy (PSMA-I &amp; T) for palliation of mCRPC is performed on Eckert &amp; Ziegler Eurotope’s Modular-Lab Pharm Tracer® automated synthesis system. Sterile GMP-certified no-carrier-added 177Lu is supplied by Australia’s Nuclear Science and Technology Organization (ANSTO). Following each synthesis, the final product quality is evaluated by High-performance liquid chromatography (HPLC) and instant thin-layer chromatography (ITLC) at three different time points: 0 hours, 24 hours, and 48 hours. Between February 2020 to October 2020, the quality of 35 batches of 177Lu-PSMA-I &amp; T was evaluated. The average radiochemical purity of ITLC-SG was found to be greater than 99 percent (99.70±05%), and HPLC was greater than 98 percent (98.60±0.05%). Our findings demonstrate that automated synthesis of 177Lu-PSMA-I &amp; T with Eckert &amp; Ziegler Eurotope’s Modular-Lab Pharm Tracer® can remain stable for 48 hours post labelling.