Reshaping the Diversity of Oxidized Polyquinane Sesquiterpenoids by Cytochrome P450s.

Polyquinane sesquiterpenoids (PQSTs) are complex compounds with two or three fused cabocyclopentane ring systems, and the biocatalysts for direct C-H bond oxidation on these scaffolds have rarely been discovered. In this study, we discovered two versatile fungal CYP450s capable of performing diverse oxidations on seven PQST scaffolds, resulting in the generation of 20 unique products. Our findings significantly expand the diversity of oxidized PQST scaffolds and provide important biocatalysts for the selective oxidation of inert carbons of terpenoids in future research.

Evaluation of tyrosine kinase inhibitors combined with antiprogrammed cell death protein 1 antibody in tyrosine kinase inhibitor-responsive patients with microsatellite stable/proficient mismatch repair metastatic colorectal adenocarcinoma: protocol for open-label, single-arm trial.

Introduction: The prognosis of patients with advanced metastatic colorectal adenocarcinoma (mCRC) after multiple-line therapy remains poor due to the high tumour load, high level of malignancy and strong drug resistance. The application of programmed cell death protein 1 (PD-1) blockade alone for patients with microsatellite stable/proficient mismatch repair (MSS/pMMR) mCRC is ineffective. PD-1 blockade combined with antiangiogenic therapy has synergistic effects and has initially shown therapeutic effects.

Dynamic monitoring of serum specific tumor markers predicts the response to PD-1 blockade and prognosis of patients with malignant tumors.

Background: Programmed cell death protein 1 (PD-1) blockade is a major advance in the treatment of malignancies, but there remain many problems in efficacy evaluation. The aim of this study was to determine whether dynamic monitoring of serum specific tumor markers (SSTMs) could predict the response to PD-1 blockade and prognosis in patients with malignancies.

Methods: The dynamic changes in SSTMs in 27 patients between January 1, 2018 and July 31, 2019 were analyzed retrospectively.