Short-Course Radiotherapy for Older Patients With Locally Advanced Rectal Cancer (SOFT Study)

The Short-Course Radiotherapy (SCRT) for Older Patients With Locally Advanced Rectal Cancer (SOFT Study) is a multicenter investigation focused on evaluating the effectiveness and feasibility of SCRT followed by delayed surgery as a treatment strategy for older patients with stage II–III rectal adenocarcinoma who are unfit for chemotherapy. This patient population often faces challenges in tolerating conventional long-course chemoradiotherapy due to age-related frailty, comorbidities, and reduced physiological reserve. The SOFT study aimed to address these challenges by offering a potentially less burdensome yet effective therapeutic approach.

### Key Features of the SOFT Study:

1. **Patient Population**:

• Older patients diagnosed with locally advanced rectal cancer (stage II–III rectal adenocarcinoma).
• Patients deemed unfit for chemotherapy due to frailty, significant comorbidities, or other health-related limitations.

2. **Treatment Protocol**:

• **Short-Course Radiotherapy (SCRT)**: Patients underwent a condensed schedule of radiotherapy, which is typically delivered over five consecutive days.
• **Delayed Surgery**: After a planned interval following radiotherapy, patients proceeded to surgical resection of the tumor.

3. **Outcomes Assessed**:

• **Tumor Response**: Both complete and partial tumor responses were observed, with evidence of tumor down-staging prior to surgery.
• **Surgical Results**: High rates of complete tumor removal were achieved during surgery.
• **Pathologic Tumor Eradication**: A subset of patients demonstrated complete tumor eradication, underscoring the biological effectiveness of SCRT.
• **Survival Outcomes**: Long-term follow-up indicated encouraging disease control and survival rates.
• **Safety and Tolerability**: Postoperative complications were deemed acceptable, and treatment-related mortality was low, highlighting the safety of the approach.

### Advantages of SCRT Followed by Delayed Surgery:

• **Reduced Treatment Burden**: SCRT involves a shorter duration of radiotherapy compared to conventional chemoradiotherapy, making it more manageable for elderly patients.
• **Oncologic Effectiveness**: The study demonstrated meaningful tumor control, with favorable rates of tumor down-staging and eradication.
• **Improved Tolerability**: The approach was associated with limited toxicity and acceptable postoperative outcomes, making it a viable option for frail patients.
• **Safety Profile**: Low treatment-related mortality and manageable side effects further support its feasibility in this vulnerable population.

### Conclusion:

The SOFT study provides strong evidence that short-course radiotherapy followed by delayed surgery is a feasible, effective, and well-tolerated alternative to standard chemoradiotherapy for older patients with locally advanced rectal cancer who are unable to undergo chemotherapy. This approach offers meaningful tumor control, favorable safety, and improved tolerability, addressing the unique needs of this patient population. It represents an important advancement in the management of elderly patients with rectal cancer, helping to standardize care for those who may otherwise struggle with conventional treatment regimens.