**Core Concept**
The management of anal squamous cell cancer requires a multidisciplinary approach, considering the cancer stage, patient's performance status, and comorbidities. In early-stage disease, the primary goal is to achieve local control of the tumor while preserving anal function.

**Why the Correct Answer is Right**
The patient's high likelihood of cure (more than 60% chances) and early-stage disease make chemoradiation the preferred treatment option. Chemoradiation combines concurrent chemotherapy and radiation therapy to target the tumor cells and prevent local recurrence. This approach has been shown to improve survival rates and preserve anal function in patients with early-stage anal cancer. The chemotherapy agent used in chemoradiation, such as 5-fluorouracil (5-FU), works by inhibiting thymidylate synthase, which is essential for DNA synthesis and repair in rapidly dividing cancer cells.

**Why Each Wrong Option is Incorrect**
* **Option A:** Surgery may be considered in cases of anal cancer where chemoradiation is not feasible or has failed. However, it is not the preferred treatment option for early-stage disease.
* **Option B:** Radiation therapy alone may be used in some cases of anal cancer, but it is less effective than chemoradiation in achieving local control and improving survival rates.
* **Option C:** Chemotherapy alone is not sufficient to control the tumor and prevent local recurrence in anal cancer, especially in early-stage disease.

**Clinical Pearl / High-Yield Fact**
In the treatment of anal cancer, the primary goal is to achieve local control of the tumor while preserving anal function. Chemoradiation is the preferred treatment option for early-stage disease, as it has been shown to improve survival rates and preserve anal function.

**Correct Answer:** C. Chemoradiation