Transcriptional inhibition after irradiation occurs preferentially at highly expressed genes in a manner dependent on cell cycle progression

[Treatment strategy for severe radiation-induced ulcers near major blood vessels]

Objective: To investigate the treatment strategy for severe radiation-induced ulcers near major blood vessels. Methods: This study was a retrospective observational study. From January 2016 to December 2023, 23 patients with radiation-induced ulcers near major blood vessels who met the inclusion criteria were admitted to Beijing Jishuitan Hospital of Capital Medical University, including 18 females and 5 males, aged 39 to 77 years. Ulcers were distributed in the axilla in 11 cases, in the groin in 4 cases, in the neck in 5 cases, and in the subclavicular region in 3 cases. According to the distance between the ulcer base and the major blood vessels, the ulcers were classified. The ulcers with major blood vessels exposed at the ulcer base was classified as exposed-vessel type (2 cases), the distance between the ulcer base and the major blood vessel wall ≤1 cm was classified as near-vessel type (8 cases), and the distance between the ulcer base and the major blood vessel wall >1 cm was classified as distant-vessel type (13 cases). After comprehensive preoperative evaluation and multidisciplinary team collaboration, the covered stents were implanted before surgery in patients with exposed-vessel type of ulcers and partial patients with near-vessel type of ulcers and high risk of vascular rupture, while preoperative vascular localization and careful operation were conducted during surgery to prevent vascular injury in other patients. After radical debridement, the wounds were repaired with flaps or myocutaneous flaps, the wound area after debridement was 6 cm×5 cm to 22 cm×12 cm, and the area of the flaps or myocutaneous flaps was 14 cm×9 cm to 27 cm×10 cm. The classification of ulcers in different regions, specific wound repair methods, and bacterial culture results of wound tissue specimens collected during the surgery were recorded. The survivals of flaps or myocutaneous flaps after surgery, the recurrence of infection or sinus, and wound healing were observed during follow-up after surgery. Results: Among the 11 patients with axillary ulcers, 3 had near-vessel type of ulcers, 8 had distant-vessel type of ulcers; among the 3 patients with subclavicular ulcers, one had near-vessel type of ulcer and two had distant-vessel type of ulcers, which were repaired with rectus abdominis myocutaneous flaps or latissimus dorsi myocutaneous flaps. Among the 5 patients with neck ulcers, two had exposed-vessel type of ulcers, and 3 had near-vessel type of ulcers, which were repaired with pectoralis major myocutaneous flaps or transverse carotid artery perforator flaps. Among the 4 patients with groin ulcers, one had near-vessel type of ulcer, and 3 had distant-vessel type of ulcers, which were repaired with tensor fascia lata myocutaneous flaps, anterolateral thigh flaps, or contralateral rectus abdominis myocutaneous flaps. The bacteria detected in the wound tissue specimens collected during surgery were mainly Staphylococcus aureus, Staphylococcus capitis, and Pseudomonas aeruginosa. Follow-up for 1 to 25 months after surgery showed that the flaps or myocutaneous flaps survived well in 14 patients and the wounds healed; two patients with infection at the flap edge healed after dressing change; seven patients had unhealed wounds due to infection recurrence or partial necrosis of the flaps. Among them, five patients underwent perforator flap or local flap transplantation again to repair the wounds, and two patients had wound healing after debridement and suture. Three patients who underwent stent implantation had their wounds healed without recurrence of infection or sinus. Conclusions: A distance-based classification for ulcers between the major blood vessels and the ulcer base, selective covered stent implantation, multidisciplinary team collaboration, and radical debridement enable safe reconstruction of radiation-induced ulcers near major vessels, significantly reducing vascular injury and infection recurrence risks.