Figures and data
Baseline demographic and clinical characteristics
Cloning and characterization of P63+ lung progenitor cells isolated from IPF patients. A, A schematic diagram illustrating the manufacturing, quality control, and clinical administration of autologous P63+ lung progenitor cell product REGEND001. B, Representative lung CT images of sampling and damaged areas of the IPF patients. Green circle: sampling area; red circle: damaged area. C, Immunostaining of clonogenic cells with basal cell markers KRT5 (green) and P63 (red). Scale bar, 30μm. D, Representative images of cell clones showing distinct morphology from different individual patients (indicated by patient numbers). Scale bar, 80μm.
Cell morphology and single-cell RNA sequencing analysis of P63+ lung progenitor cells isolated from IPF patients.
A, Correlation analysis of cell colony roundness with patient age and lung functions. Each point represents one single cell colony, and each color represents an individual patient. B, Uniform manifold approximation and projection (UMAP) plot showing three subpopulations of cells cloned from a patient. C, Feature plots of representative cell markers. D, Gene ontology enrichment analysis of the differentially expressed genes identified in three subpopulations. E, Feature plots of representative variant progenitor cell markers.
Adverse Eventsa
Changes of lung functions and 6MWD at different time points after REGEND001 treatment. (A-D)
The plots indicated mean (S.E.M.) changes from baseline in absolute value of DLCO/VA percentage to predicted value, DLCO absolute value, FVC percentage to predicted value and 6MWD. The low dose group included the 3 patients in the 0.6 M group, while the high dose groups included the 7 patients in the 1 M, 2 M, and 3.3 M dose groups. P values between two groups were calculated according to the area under curve (AUC).
Representative lung CT image before and after REGEND001 treatment.
A, Representative lung CT images of the Patient #005 and #006 at baseline and 24 weeks after REGEND001 treatment. Red circle indicated resolution of honeycomb lesion. B, Three-dimensional visualization of consecutive CT images of the Patient #006. The red zone indicated the lung damaged areas (reticulation and honeycomb) before and after cell therapy. The white circle indicated resolution of the lesion in lower lobes.
Profile of current clinical trial.
In total 12 patients were recruited for the trial and assigned to 4 dose groups. All patients in the 2 M and 3.3 M groups were infected by SARS-CoV-2 during the follow-up period. Two patients (#007 and #008) in the 2 M group were excluded from the efficacy analysis because they missed the 24-week visit due to the lockdown policy during COVID-19 pandemic. The remaining 10 patients were subjected to both safety and efficacy analysis
Quality control of cultured lung progenitor cells.
A, FACS gating strategy for cell identity and purity test. KRT5 was immunostained as a marker of lung progenitor cells. SSC, side-scatter, FSC, forward scatter. B, Soft agar assay, also known as a tumorigenicity test, showing the lack of tumor formation by P63+ lung progenitor cells. Human melanoma cells were used as a positive control, while growth-arrested 3T3 cells served as a negative control. C, Representative image of feeder-free cultured lung progenitor cells before being harvested for transplantation. Scale bar, 80 μm.
Changes in clinical laboratory evaluations of blood routine following cell therapy.
The line plot displays the changes of various indicators of blood routine for patients over time, with each line representing one patient, and the patient number is marked alongside the line. The horizontal dashed line indicates the normal reference range.
Changes in clinical laboratory evaluations of blood biochemistry following cell therapy.
The line plot displays the changes of various blood biochemistry indicators over time, with each line representing a patient, and the patient number is labeled alongside the line. The horizontal dashed line indicates the normal reference range.
Changes in clinical laboratory evaluations of serum tumor markers following cell therapy.
The line plot displays the changes of various tumor markers in blood sample of patients over time, with each line representing one patient, and the patient number is labeled alongside the line. The horizontal dashed line indicates the normal reference range for that indicator.
Changes of predicted DLCO%, DLCO, predicted DLCO/VA%, DLCO/VA, predicted FVC%, FVC, 6MWD and SGRQ score at different time points after cell therapy.
The line plot displays the changes of various indicators for patients after cell therapy. Each line represents a patient, and the patient number is labeled along the line. The black triangles indicate the time when the patients were infected by SARS-CoV-2.
