Here is a brief description about BRCA gene mutations and the manner in which they predispose to various cancers (see: BRCA mutation):
A BRCA mutation is a mutation in either of the BRCA1 and BRCA2 genes, which are tumor suppressor genes....Harmful mutations in these genes may produce a hereditary breast-ovarian cancer syndrome in affected persons. Only 5-10% of breast cancer cases in women are attributed to BRCA1 and BRCA2 mutations..., but the impact on women with the gene mutation is more profound. Women with harmful mutations in either BRCA1 or BRCA2 have a risk of breast cancer that is about five times the normal risk, and a risk of ovarian cancer that is about ten to thirty times normal. The risk of breast and ovarian cancer is higher for women with a high-risk BRCA1 mutation than with a BRCA2 mutation.
Most of the attention regarding BRCA mutations has been focused on women but men who inherit the BRCA1 or BRC2 gene are also at greater risk for prostate and pancreatic cancers as well as malignant melanoma (see: Familial Pancreatic Adenocarcinoma; Genetics of Prostate Cancer; Skin Cancer Risk in BRCA1/2 Mutation Carriers). Here are more details about men and BRCA from a 2012 article (see: Males With Mutated BRCA1 Breast Cancer Gene Have Higher Prostate Cancer Risk):
Men who carry the mutated BRCA1 gene have a four times greater chance of developing prostate cancer than other males....Men with the mutated BRCA1 gene are also more susceptible to the very aggressive form of prostate cancer....In Great Britain, more than 50% of prostate cancer cases are diagnosed in males over the age of 70 years, making age the main risk factor. In...[one] study,...out of 913 men who underwent screening, three-quarters of the ones carrying the mutated BRCA1 gene had a prostate cancer diagnosis before reaching 64 years of age, indicating clearly that the presence of the faulty gene might serve as an early warning for individuals with a higher risk of developing the disease at a younger age.
Here is more information about the association of BRCA2 and familial pancreatic adenocarcinoma from the first link above:
Familial pancreatic cancer (FPC) designates kindreds that contain at least two first degree relatives with pancreatic ductal adenocarcinoma. Studies of FPC have focused on discovery of genetic etiology and on management of those at genetically high risk. Over a decade of research reveals that a half dozen known hereditary syndromes or genes are associated with increased risk of developing pancreatic cancer, the most prominent of which are BRCA2 and CDKN2A.
The lesson from all of this is quite clear. Men with BRCA-positive female relatives also need to be tested. If positive, they may need to undergo screening for prostate and pancreatic cancers and perhaps other neoplasms. If male patients test BRCA-positive, it's important that their female relatives also be tested for the gene.