The LUCINAE Registry is an international, multicenter observational study collecting data on patients with thoracic cancers (including lung cancer) who are expecting a child. This includes women diagnosed during pregnancy, women who become pregnant during or after cancer, and men receiving cancer treatment at the time their partner conceives.

Because thoracic cancers during pregnancy are rare, there is limited information to guide clinical decisions. This registry aims to describe patient characteristics, diagnostic approaches, treatments, and maternal and fetal outcomes. Data are collected retrospectively and prospectively from participating centers.

The results of this registry are expected to improve understanding of thoracic cancers in this setting and support the development of future clinical recommendations.

The LUCINAE Registry (LUng and thoracic Cancers In pregNAncy rEgistry) is an international, multicenter registry with retrospective and prospective (ambispective) data collection.

The incidence of cancers in younger individuals is increasing, and due to delayed maternal age and other factors, more patients are diagnosed with cancer during pregnancy or become pregnant during or after cancer treatment. Thoracic cancers during pregnancy are rare events, but they are associated with high maternal morbidity and mortality and may have important implications for fetal outcomes.

Currently, there is a lack of specific clinical guidelines for the management of thoracic cancers during pregnancy, and limited data are available regarding the safety and outcomes of anticancer treatments in this setting. Existing registries are not specific for thoracic malignancies, and available evidence is based on a limited number of reported cases.

The LUCINAE Registry aims to collect comprehensive data on biologically female and male patients with thoracic cancers who are expecting a child. The primary objective is to describe clinical and biological characteristics, family history, treatments, and maternal and fetal outcomes.

The study includes two cohorts:

Cohort A (retrospective): patients included after death, with data collected from medical records.

Cohort B (prospective): patients currently treated or diagnosed during the enrollment period, with longitudinal follow-up and periodic data updates.

Eligible participants include women diagnosed with thoracic cancer during pregnancy, women who become pregnant during active disease or within 5 years after treatment, and men receiving active oncological treatment at the time their partner conceives.

Data collected include patient characteristics (demographics, medical history, genetic information), tumor characteristics (stage, histology, biomarker status), diagnostic procedures, treatment details (including systemic therapies, surgery, and radiotherapy), pregnancy characteristics, complications, and maternal and fetal outcomes. Follow-up data are collected at multiple timepoints up to 5 years after delivery, when available.

Analyses will be primarily descriptive and will evaluate clinical and biological characteristics, treatment patterns, and outcomes. Correlation analyses between treatments and outcomes will also be performed. The study does not impose any intervention, and all treatment decisions are made by the treating physicians.

The registry is intended to improve understanding of thoracic cancers in the context of pregnancy, to support future research, and to contribute to the development of clinical management strategies for this patient population.

Inclusion Criteria:

• 1. All patients with a diagnosis of thoracic cancer (including lung cancer, mesothelioma, thymic epithelial tumors, neuroendocrine tumors or sarcoma of the thorax and other rare thoracic entities) and pregnancy (positive pregnancy test) including:

  1. Patients receiving a diagnosis of thoracic cancer during pregnancy
  2. Patients who became pregnant while having active thoracic cancer
  3. Patients previously treated for a thoracic cancer and becoming pregnant in the 5 years following end of treatment OR Men with a diagnosis of thoracic cancer (including lung cancer, mesothelioma, thymic epithelial tumors, neuroendocrine tumors or sarcoma of the thorax and other rare thoracic entities), who were undergoing active oncological treatment at the time their partner conceived their child.

• 2. Available information about pregnancy outcomes

• 3. Age ≥ 18 years

Exclusion Criteria:

• 1. Patient missing data about thoracic cancer stage and diagnosis
• 2. For retrospective patients, documented refusal to the use of clinical data for research purposes

The study will include all pregnant biological female patients, of any ethnicity, with a diagnosis of thoracic cancer at any stage and men with a diagnosis of thoracic cancer who were undergoing active oncological treatment at the time their partner conceived their child.