Okay, let's tackle this question. The patient is a 40-year-old woman with a 2 cm breast nodule and a proven metastatic axillary node. The question is about the appropriate treatment.

First, I need to recall the staging of breast cancer. The presence of a 2 cm tumor (T2) and a positive axillary node (N1) would place this as Stage IIB or Stage IIIA, depending on other factors. But the main point here is treatment options.

The standard treatment for operable breast cancer with positive nodes is typically a combination of surgery and adjuvant therapy. The options might include mastectomy or lumpectomy followed by radiation. Since the axillary node is involved, a mastectomy might be more appropriate than a lumpectomy, especially if the tumor is larger. However, if the patient is a good candidate for breast-conserving surgery, that could be an option with radiation.

Wait, but the question mentions a 2 cm nodule. That's T2. With a positive axillary node, the treatment would likely be a modified radical mastectomy. Alternatively, if the patient is eligible, a lumpectomy plus radiation with adjuvant chemotherapy and possibly hormonal therapy if hormone receptor positive.

But the options given here are A to D, but they aren't listed. The correct answer is probably the modified radical mastectomy. Let me think. The presence of a positive axillary node suggests that the cancer has spread beyond the breast, so surgery to remove the breast and axillary lymph nodes is standard. Adjuvant therapy like chemotherapy, radiation, and hormonal therapy would follow. So the initial treatment is surgery.

Wait, but sometimes in cases where the tumor is operable, a lumpectomy might be considered if the patient is a good candidate. But with a 2 cm tumor and a positive node, the oncologist might lean towards mastectomy to reduce the risk of local recurrence. So the correct answer is likely modified radical mastectomy.

The wrong options might be things like simple mastectomy (which doesn't remove axillary nodes), lumpectomy alone (which would require radiation but might not be sufficient for positive nodes), or maybe even something like chemotherapy alone as primary treatment. Each of these would be incorrect because they don't address the local disease adequately.

So the core concept here is the treatment of operable breast cancer with regional lymph node involvement. The correct answer is modified radical mastectomy, followed by adjuvant therapy. The other options are either insufficient or not the standard of care.

**Core Concept**
This question tests the management of locally advanced breast cancer with regional lymph node involvement. The key principle is that **modified radical mastectomy** is the standard surgical approach for tumors ≥2 cm with axillary lymph node metastasis, followed by adjuvant therapy based on histopathology.

**Why the Correct Answer is Right**
Modified radical mastectomy involves total removal of the breast tissue, axillary lymph nodes (levels I and II), and preservation of the pectoralis major muscle. A 2 cm tumor (T2) with a positive axillary node (N1) indicates **Stage IIB** breast cancer. Surgery aims to achieve complete resection with clear margins, while axillary dissection stages the disease and guides systemic therapy. Adjuvant chemotherapy, radiation, and endocrine therapy (if hormone receptor-positive) are added postoperatively

✓ Correct Answer: C. Patey's with adjuvant chemotherapy