The P2M.db represents a comprehensive resource encompassing 49 cancer types and subtypes, originating from 28 primary tissues (including breast, colorectal, gastric, and pancreatic carcinomas) and metastasizing to 25 secondary sites (such as hepatic, lymph nodal, pulmonary, and cerebral tissues).

Our database integrates single-cell RNA sequencing data from 51 datasets, comprising 3,745,638 cells. Bulk transcriptomic data, systematically curated from GEO and TCGA repositories, includes 12,896 samples across 86 datasets.

The platform is equipped with 13 analytical modules designed to facilitate comparative analyses between primary and metastatic neoplasms, enabling users to explore, visualize, and download processed datasets and analytical results.