There are two types of oncogene panel tests, one that uses only tumor tissue and the other that analyzes a pair of normal tissue and tumor tissue. In the former, the suspicion of germline variants is examined, considering the data of Variant allele frequency (VAF), while in the latter, hereditary tumors are diagnosed comparing germline variant information with that of normal tissues. Oncogene panel tests are approved for insurance as medical examination for patients who have completed or are expected to complete standard treatment. If the germline is diagnosed with a pathogenic variant in this situation, the results are of low utility value to the subject. Therefore, it is an important point how to provide information on hereditary tumors to their relatives based on the results of panel tests. In other words, genetic counseling is a place of chance to provide germline variant information to their relatives, and to consider subsequent supports including psychological care for them. The definition of genetic counseling is one of the process of supports for the parties to the genetic diseases, their families and relatives to understand and adapt to the genetic involvements of their diseases in the medical, psychological, and familial affaires. Missions of genetic counselors are therefore to support them by thinking with them how to live with or without genetic information. This time, we will discuss the role of genetic counseling on the timing and processing to provide germline information in the diversified situations of germline information by expanding the types and indications of oncogene panel tests.