**Core Concept**
Triple negative breast cancer (TNBC) is a subtype of breast cancer characterized by the absence of estrogen receptors (ER), progesterone receptors (PR), and excess HER2 protein. It is a heterogeneous group of tumors with distinct molecular and histopathological features.

**Why the Correct Answer is Right**
TNBCs are aggressive and tend to occur in younger women, often with a higher grade and stage at diagnosis. They are more likely to be associated with BRCA1 mutations and have a poor prognosis compared to other breast cancer subtypes. The absence of hormone receptors and HER2 protein makes TNBC unresponsive to endocrine therapy and trastuzumab, respectively.

**Why Each Wrong Option is Incorrect**
**Option A:** TNBC is not typically associated with BRCA2 mutations; **Option B:** TNBC does not have a better prognosis than other breast cancer subtypes; **Option C:** TNBC is not characterized by the presence of HER2 protein.

**Clinical Pearl / High-Yield Fact**
TNBCs are often treated with a combination of chemotherapy, radiation therapy, and surgery, with a focus on aggressive local and systemic treatment due to their high recurrence rate and poor prognosis.

**Correct Answer:** C.