Couples diagnosed with unexplained subfertility are advised to start mild ovarian hyperstimulation and intrauterine insemination (MOH-IUI) as a primary treatment. Natural feedback mechanisms and hormone release are affected by artificially stimulated cycles and induced ovulation. Additional luteal support could positively affect progesterone patterns in the luteal phase. The LUMO study evaluates whether the addition of exogenous progesterone in the luteal phase following MOH-IUI treatment cycle will improve pregnancy and live birth rates.

A multicentre randomised, double-blind, controlled trial will be conducted in Dutch fertility clinics, academic and non-academic hospitals. There are two treatment arms: group A progesterone luteal phase support; group B placebo, without crossover. All initiated MOH-IUI cycles within 6 months after randomisation are included (study period). Participants will start study medication, applying a daily dosage of 2dd 300 mg progesterone (Utrogestan) or 2dd 300 mg placebo in vaginal capsules on the second day after the IUI procedure. Treatment is continued until the onset of menstruation, a negative pregnancy test (IUI+14 days), a miscarriage or until 7 weeks of gestation in case of a viable pregnancy. Follow-up ends at 12 months after the end of study period (18 months after study randomisation). The primary outcome is cumulative pregnancy rate, achieved within 6 months after randomisation, leading to live birth. A total of 1008 patients (504 patients in each group) will be included.

The study was approved by the Central Committee on Research Involving Human Subjects on 30 January 2023. All participating sites have the approval of the local Board of Directors to participate in the LUMO study. An informed consent form will be signed by all participants. Study results will be presented at (inter)national conferences and published in peer-reviewed journals. It is expected that the results of this trial will be used to draft national guidelines on this issue.

The study is registered in the EU CTIS trial register (2022-501534-33-00), the Dutch trial registry (registration number: LTR 24508), ClinicalTrials.gov (NCT05080569) and the WHO registry (universal trial number: U1111-1280-9461).

To explore perceptions regarding the approved and actual prescribed doses of protein kinase inhibitors (PKIs) in clinical practice in the European Union among medicine regulators and healthcare professionals (HCPs).

A qualitative descriptive study was conducted using semistructured interviews, continuing until thematic saturation was reached. Thematic analysis was undertaken using a combined deductive-inductive approach. Deductive main analytical themes were derived from the theoretical framework of questioning-based policy design, namely problem sensing, problem categorisation and problem decomposition. Subthemes were generated inductively and could coherently be situated within these main analytical themes.

Interviews were held online or in person at a location convenient for the interviewee, depending on the participant’s preference.

Seven medicine regulators involved in the regulation of cancer medicines—including PKIs—and 10 HCPs prescribing PKIs in clinical practice, from various countries within Europe, were included.

Regulators highlighted insufficient attention to optimal dose finding, yielding approved doses often based on outdated maximum tolerated dose concepts, leading to uncertainties in efficacy and safety. HCPs reported using alternative dosing strategies in clinical practice to improve tolerability and quality of life (QoL) but noted a lack of robust evidence to guide such adjustments and faced legal constraints to deviate from the approved dose. Participants emphasised the need for improved pre-approval and post-approval dose optimisation to improve safety, enhance QoL and bridge gaps between trial data and real-world patient diversity.

Collaborative efforts involving multistakeholders including HCPs, regulators, pharmaceutical companies, insurers, governments and patient representatives are essential to advance dose optimisation and improve patient-centric outcomes, with further research needed to understand these stakeholders’ perspectives.