Final answer:
A history of multiple family members with gastric cancer, particularly before age 50 years, or multiple family members with lobular breast cancer with or without gastric cancer, suggest the possibility of a genetic predisposition and the need for genetic counseling and testing for mutations of the BRCA gene.
Step-by-step explanation:
A history of multiple family members with gastric cancer, particularly before age 50 years, or multiple family members with lobular breast cancer with or without gastric cancer, suggest the possibility of a genetic predisposition and the need for genetic counseling and testing for mutations of the BRCA gene.