[68Ga]Ga DOTA-5G as a Diagnostic Imaging Agent for Metastatic/Advanced Invasive Lobular Breast Cancer (LBC)

This study is testing a new imaging scan (using a radioactive tracer called [68Ga]Ga DOTA-5G) to see if it can better detect and locate metastatic invasive lobular breast cancer — a type that is harder to see on standard imaging. **You may be eligible if...** - You are 18 or older (any gender) - You have confirmed metastatic or advanced invasive lobular breast cancer with measurable disease - You have archived tumor tissue available for analysis - You can lie still for 30–60 minutes during a scan - Your blood counts and organ function meet study requirements **You may NOT be eligible if...** - You are pregnant or breastfeeding - You have severe kidney, liver, or blood count problems - You have another active cancer in addition to breast cancer - You cannot undergo the scan due to medical or physical limitations Talk to your doctor to see if this trial is right for you.