RE: Precision platform overlooked yet again28 Mar 2024 12:32
Anyone saying the PreCision platform has been overlooked yet again is misleading this BB...
Firstly, we already have a PreCision deal in place with Point Biopharma.
https://avacta.com/license-agreement-with-point-biopharma-inc/
Point Biopharma have just been acquired by Eli Lilly.
https://investor.lilly.com/news-releases/news-release-details/lilly-completes-acquisition-point-biopharma
'Cryptophycin-52 (Cr-52, LY355703, 11) was designed by Eli Lilly, and its reported potency is 40- to 400-fold greater than that of paclitaxel or vinca alkaloids, making it a promising clinical candidate [111,112,113,114]. The mechanism of action involves suppressing microtubule dynamics and arresting cells in the G2/M phase. However, the co-crystallization data between Cr-52 and tubulin has not yet been solved, and the details of the binding site remain elusive. The Cr-52 structure is an analogue to cryptophycin-1, containing two hydroxy acids (units A and D) and two amino acids (units B and C). Due to the steric hindrance of the geminal dimethyl group, it is more resistant against ester hydrolysis than are cryptophycin-1 derivatives [103]. After numerous preclinical studies, Eli Lilly advanced Cr-52 to clinical trials, with aims to define the MTD, recommended dose, pattern of toxicity, and pharmacokinetic profile. Two Phase I clinical trials were performed, and a dose of 1.5 mg/m2 was recommended for Phase II evaluation on a day 1 and 8 schedule every 21 days [111].
Despite these findings, the treatment effect for NSCLC was not achieved as expected. Twenty-six patients were enrolled, of whom 25 were evaluable for toxicity and response. There were no responders when the weekly dose was lowered from 1.5 mg/m2 to 1.125 mg/m2. Median survival was 4.1 months, and toxicity was predominantly neurologic in the form of peripheral neuropathy and constipation [113]. Another study was performed to determine the activity of LY355703 and to characterize its toxicity profile in patients with platinum-resistant advanced ovarian cancer, but only modest activity was observed in these patients [114].
Cr-52 failed in Phase II clinical studies due to the lack of efficacy and its high toxicity at the chosen doses. Although the cryptophycins were unable to advance to stand-alone agents, desirable characteristics including high potency, relative hydrophilicity, lack of P-gp susceptibility, and a common resistance mechanism make it an attractive ADC payload. '
Now who'se to say Lilly might not be looking at PreCision???