How many days does a course of radiotherapy last?
Jul 09, 2021
Source: Cainiu Health
Dr. Zhou Maoxin
Introduction
The duration of a radiotherapy course is closely related to the specific disease. Different diseases require different radiation doses, and thus the treatment duration varies accordingly. For example, in adjuvant postoperative radiotherapy for breast cancer, the commonly used total radiation dose is 50 Gy; if delivered at 2 Gy per fraction, the course requires 25 days to complete. In contrast, for esophageal cancer, some patients may require a total dose of 70 Gy, extending the treatment duration to 35 days.
Radiotherapy’s efficacy depends on radiosensitivity—the degree of response to radiation varies significantly among different organs, tissues, and tumor types. Radiosensitivity is closely associated with the tumor cells’ proliferative cycle and histopathological grade: rapidly dividing cells are more radiosensitive than non-proliferating ones, while higher cellular differentiation correlates with lower radiosensitivity—and conversely, poorer differentiation implies greater radiosensitivity. So, how many days does a course of radiotherapy typically last? Below, we address this question.
How Long Does a Course of Radiotherapy Last?
The duration of a radiotherapy course is closely linked to the specific disease being treated; different conditions require distinct total radiation doses, resulting in varying treatment durations. For example, in adjuvant postoperative radiotherapy for breast cancer, a typical total dose is 50 Gy. Administered at 2 Gy per fraction, this requires 25 treatment sessions—usually delivered over 25 weekdays (Monday through Friday). In contrast, esophageal cancer may require up to 70 Gy, extending treatment to 35 weekday sessions. However, radiotherapy is generally scheduled Monday through Friday, with weekends (Saturday and Sunday) reserved for rest. Therefore, when calculating the overall calendar time required—including weekends—a typical course lasts approximately four to six weeks, or sometimes even longer. Patients are advised to rest adequately, stay well-hydrated, and increase fluid intake to facilitate the elimination of metabolic byproducts.
Knowledge Extension: Side Effects of Radiotherapy
1. Fatigue and Weakness
During radiotherapy, the body expends substantial energy on self-repair and recovery, often leading to pronounced fatigue over time. Nausea and vomiting may also occur due to radiation-induced gastric dysfunction. Patients are encouraged to drink ample fluids to accelerate toxin elimination and alleviate treatment-related discomfort.
2. Skin Damage
Radiation can cause direct injury to the skin, resulting in symptoms such as pruritus (itching), desquamation (peeling), erosion, and exudation. If skin breakdown occurs with secondary infection, mild cases may be managed with topical anti-inflammatory ointments; more severe infections may necessitate intramuscular administration of anti-inflammatory medications.
3. Hair Loss
Radiation inflicts significant damage upon hair follicles, causing noticeable alopecia in many patients during treatment. Fortunately, hair regrowth typically occurs after radiotherapy concludes. Additionally, systemic effects—including hematologic toxicity—may occur; some patients experience peripheral blood count reductions during treatment, and severe cases may develop anemia.
The above outlines the typical duration of a radiotherapy course. We hope this information proves helpful.
