Germline mutation in multiple primary malignancies associated with prostate cancer.
e17505 Background: Multiple primary malignancies (MPM) are described as that one individual develop several malignancies that originate from different tissues at the same time or separated (different histology in different location). MPM are also considered as an indicator of germline mutation or hereditary disease. Here we performed next generation sequencing-based 642-gene panel test on the MPM patients to figure out the candidate germline mutation essential for multiple tumorigenesis. Methods: Blood samples from 27 patients diagnosed as MPM with prostate cancer and at least one additional primary cancer from 2018.12 to 2019.12 were collected to detect the germline variation of 642 gene panel. Meanwhile 25 blood samples from patients only diagnosed as prostate cancer were taken as control. After the sequencing results were obtained, the differences between the multiple primary and single primary cohorts were counted. Results: Statistical analysis of the mutations in the multi-primary and single-primary cohorts revealed that differences were concentrated in the following six genes: ESR1, PTPRB, CIC, ANKRD11, BRCA2, MLH1. It was found that the mutations of p.G145S and p.P146Q (frequency 18.5%) of ESR1 gene and p.G1150W (frequency 14.8%) of PTPRB gene which related to angiogenesis were only found in multiple primary cohort. And mutations of growth factor pathway gene CIC (frequency 22.2%), mutation of chromatin remodeling family gene ANKRD11, and two genes of DDR pathway (BRCA2, MLH1) appeared higher in multiple primary cohort, although there was no statistical difference. Conclusions: We found for the first time that the p.G145S and p.P146Q mutations of the estrogen receptor ESR1 gene and the p.G1150W mutation of the angiogenesis-related PTPRB gene may be the drivers of multiple primary prostate cancer, which need further study.