Primary mucosal melanoma is a rare disease, with a worse prognosis than cutaneous melanoma. We present a patient with primary melanoma of the stomach and small intestine, with good outcome after radical surgical excision and adjuvant ipilimumab therapy.

Background: Nowadays, more breast cancer patients want to have children after the diagnosis of cancer. The purpose of this study is to review the possibility and risks of giving birth among women with breast cancer previously treated by chemotherapy.

AIM: Most patients tested by a 44-gene panel for hereditary cancer (HerediGene), even though they had a strong family history, have a negative result or a finding in a low-risk gene. This creates a question about the risk for these individuals to develop breast cancer. The Polygenic Risk Score is a tool used to identify and calculate the lifetime risk of developing breast cancer and thus we are investigating whether it can be used in our cohort of patients to identify this risk. PATIENTS AND METHODS: Among 111 patients analyzed with a 44-gene hereditary cancer panel, we were able to produce the Polygenic Risk Score for 105 of them. All the patients were diagnosed with breast cancer, and they all had a strong family history. We analyzed the ability of the PRS to identify the risk of the patients in combination with the findings of the 44-gene panel. RESULTS: Overall, 74% of patients with a family history had a negative PRS (with a cut-off of 20%). Among the BRCA positive patients all of them had a positive PRS and among all the high-risk gene positive cases, 70% had a positive PRS. On the other hand, among the low-risk genes and the negative cases 18.5% had a positive PRS. There is a positive correlation between the findings from the NGS panel analysis and the PRS. CONCLUSION: Our analysis shows that PRS is correlated to the findings of the 44-gene NGS panel having the majority of the PRS positive patients carry high risk mutations. In addition to this, in 18.5% of the patients with low-risk findings or negative result from the 44-gene panel, the PRS was positive which can explain the outcome of the patient since breast cancer had developed. This is an indication that the combination of PRS with the findings from the 44-gene panel can identify individuals with a higher risk of developing breast cancer. Citation Format: Nikolaos Tsoulos, Konstantinos Agiannitopoulos, Helen Goga, Theodoros Troupis, Christos Markopoulos. Polygenic Risk Score in a cohort of 105 Breast Cancer patients previously tested with a multi gene panel for hereditary cancer [abstract]. In: Proceedings of the 2022 San Antonio Breast Cancer Symposium; 2022 Dec 6-10; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2023;83(5 Suppl):Abstract nr P5-12-07.