Evaluating the indotecan-neutropenia relationship in patients with solid tumors by population pharmacokinetic modeling and sigmoidal E regressions.

Purpose: This study aimed at characterizing indotecan population pharmacokinetics and explore the indotecan-neutropenia relationship in patients with solid tumors.

Methods: Population pharmacokinetics were assessed using nonlinear mixed-effects modeling of concentration data from two first-in-human phase 1 trials evaluating different dosing schedules of indotecan. Covariates were assessed in a stepwise manner.

The hormonal environment and estrogen receptor signaling alters infection .

Genital is the most common bacterial sexually transmitted infection in the United States and worldwide. Previous studies indicate that the progression of chlamydial infection is influenced by various factors, including the female sex hormones estrogen and progesterone. Sex hormone levels naturally fluctuate in women throughout their menstrual cycle.

Impact of an in-person small group surgical skills course for preclinical medical students in an era of increased e-learning.

Objective: The COVID-19 pandemic led to a dramatic decrease in face-to-face teaching. This can particularly impact medical students' skills development. This prompted development of an in-person surgical skills course as guided by the General Medical Council "Outcomes for Graduates" facilitated by tutors with surgical experience.

Liquid chromatography-mass spectrometry applications for quantification of endogenous sex hormones.

Liquid chromatography, coupled with tandem mass spectrometry, presents a powerful tool for the quantification of the sex steroid hormones 17-β estradiol, progesterone and testosterone from biological matrices. The importance of accurate quantification with these hormones, even at endogenous levels, has evolved with our understanding of the role these regulators play in human development, fertility and disease risk and manifestation. Routine monitoring of these analytes can be accomplished by immunoassay techniques, which face limitations on specificity and sensitivity, or using gas chromatography-mass spectrometry.