PT - JOURNAL ARTICLE AU - Vyas, Madhusudan AU - Lim, Remy AU - Fagan, Jessica AU - Chandrashekar, Rudresh TI - Stability Matters: Radiochemical Stability of Therapeutic Radiopharmaceutical <sup>177</sup>Lu-PSMA I&amp;T AID - 10.2967/jnmt.121.262423 DP - 2022 Sep 01 TA - Journal of Nuclear Medicine Technology PG - 244--247 VI - 50 IP - 3 4099 - http://tech.snmjournals.org/content/50/3/244.short 4100 - http://tech.snmjournals.org/content/50/3/244.full SO - J. Nucl. Med. Technol.2022 Sep 01; 50 AB - Labeling radiopharmaceuticals and testing the quality of the labeled product before injecting it into patients are standard operating procedures in the nuclear medicine department. There is a different shelf life for each labeled product, which determines how long a product can maintain in vitro stability before it needs to be discarded. 177Lu is a radioactive isotope that is increasingly being accepted into the treatment paradigm for palliation of advanced-stage tumors, including metastatic castration-resistant prostate cancer (mCRPC) and neuroendocrine tumors (NETs). 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 an automated synthesis system. Methods: After each synthesis, the final product quality was evaluated by high-performance liquid chromatography (HPLC) and instant thin-layer chromatography (ITLC) at 3 different time points: 0, 24, and 48 h. Between February 2020 and October 2020, the quality of 35 batches of 177Lu-PSMA I&amp;T was evaluated. Results: The average radiochemical purity of ITLC-silica gel was found to be greater than 99% (99.70% ± 0.05%), and HPLC was greater than 98% (98.60% ± 0.05%). Conclusion: Our findings demonstrate that synthesis of 177Lu-PSMA I&amp;T with an automated synthesis system can remain stable for 48 h after labeling.