Observational studySupportive care in cancer : official journal of the Multinational Association of Supportive Care in Cancer2024
Cystine and theanine for chemoradiotherapy-induced esophagitis in non-small cell lung cancer: a prospective observational study.
Observational study in Supportive care in cancer : official journal of the Multinational Association of Supportive Care in Cancer, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
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Who cites it
2 citing papers in PubMed.
- Efficacy of Jishi Shuanghua Granules in preventing radiation-induced esophagitis in non-small cell lung cancer patients undergoing concurrent chemoradiotherapy: protocol for a multicenter, randomized, double-blind, placebo-controlled trial.Frontiers in medicine · 2026Article
- Expanding horizons in esophageal squamous cell carcinoma: The promise of induction chemoimmunotherapy with radiotherapy.World journal of clinical oncology · 2025Article
Corrections and comments
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Authors and funding
7 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
purposeAlthough several potential radioprotectants have been explored, radiation esophagitis is still difficult to control. Further development of supportive therapies is required. Our purpose was to investigate the efficacy and safety of cystine and theanine for esophagitis in non-small cell lung cancer (NSCLC) patients undergoing chemoradiotherapy (CRT).
methodsThis study is a prospective observational study. The participants were recruited from unresectable locally advanced NSCLC who had scheduled to receive weekly paclitaxel or nab-paclitaxel/carboplatin plus radiation therapy (60 Gy in 30 fractions) for 6 weeks. They took an oral amino acid supplement containing 700 mg cystine and 280 mg theanine once daily regardless of CRT timing from the start of CRT until completion. The primary endpoint was the incidence of any grade esophagitis. The secondary endpoints were quality of life (QoL) and adverse events (AEs).
resultsA total of 26 patients were evaluated. All participants completed 60 Gy of RT in 30 fractions. The overall incidence of esophagitis was 73%; however, no ≥ grade 3 was reported. There were no AEs likely to be related to cystine and theanine. The mean EuroQoL 5-Dimension 5-Level health index score before and after chemoradiotherapy was 0.952 ± 0.0591 and 0.952 ± 0.0515 (P = 0.89), and the mean Visual Analogue Scale scores before and after treatment were 67.9 ± 15.4 and 79.4 ± 13.2 (P = 0.0047), respectively.
conclusionOur study showed no severe esophagitis, any AEs, nor QoL decrease in NSCLC patients receiving CRT. Cystine and theanine are potentially effective to reduce severe CRT-induced esophagitis.
trial registrationUMIN000052622, 26 October 2023, retrospectively registered.
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Registered trials
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