RESUMO
Background: This study aimed to determine whether proton craniospinal irradiation (CSI) decreased the dose to normal tissue and resulted in less toxicity than photon CSI for adult patients. Methods: This single-institution retrospective analyzed differences in radiation doses, acute toxicity, and cost between proton and CSI for adult medulloblastoma patients. Results: Of 39 total patients, 20 were treated with photon CSI prior to 2015, and 19 were treated with proton CSI thereafter. Median age was 28 years (range 18-66). The molecular subtype was most commonly sonic hedgehog (68%). Patients most commonly received 36 Gy CSI in 20 fractions with a boost to 54-55.8 Gy (92%). Proton CSI delivered significantly lower mean doses to cochleae, lacrimal glands, lens, parotid glands, pharyngeal constrictors, esophagus, lungs, liver, and skin (all Pâ <â .001). Patients receiving proton CSI had significantly lower rates of acute dysphagia of any grade (5% versus 35%, Pâ =â .044) and decreased median weight loss during radiation (+1.0 versus -2.8 kg, Pâ =â .011). Weight loss was associated with acute hospitalization (Pâ =â .009). Median follow-up was 2.9 and 12.9 years for proton and photon patients, respectively, limiting late toxicity and outcome comparisons. At the last follow-up, 5 photon patients had died (2 of progressive disease, 3 without recurrence ages 41-63) and 21% had experienced major cardiovascular events. At 10 years, 89% were alive and 82% were recurrence free. Conclusions: This study demonstrates dosimetric improvements with proton CSI, potentially leading to decreased acute toxicity including dysphagia and weight loss during treatment.
Assuntos
Carcinoma de Células Escamosas/sangue , DNA Tumoral Circulante/análise , Continuidade da Assistência ao Paciente/economia , Testes Hematológicos/economia , Neoplasias Orofaríngeas/sangue , Alphapapillomavirus , Carcinoma de Células Escamosas/terapia , Carcinoma de Células Escamosas/virologia , Análise Custo-Benefício , Estudos Transversais , Humanos , Neoplasias Orofaríngeas/terapia , Neoplasias Orofaríngeas/virologia , Infecções por Papillomavirus/sangue , Infecções por Papillomavirus/terapia , Valor Preditivo dos Testes , Estados UnidosRESUMO
OBJECTIVE: Diagnostic delay in human papillomavirus-associated oropharynx squamous cell carcinoma (HPV(+)OPSCC) is common due to nonspecific symptoms. We aim to describe the disease burden and oncologic outcomes of patients with HPV(+)OPSCC diagnosed >12 months after symptom onset. STUDY DESIGN: This is a retrospective cohort study of HPV(+)OPSCC patients receiving intent-to-cure treatment (including surgery ± adjuvant therapy or primary chemoradiation). SETTING: 2006-2016, tertiary care center. METHODS: Tumor stage was compared between patients with and without delayed diagnosis using χ2 tests. Kaplan-Meier survival analysis with univariate and multivariable Cox regressions were used to determine the effect of diagnostic delay on oncologic outcomes. RESULTS: In total, 664 patients were included. Compared to patients diagnosed <12 months from symptom onset (n = 601), those diagnosed at >12 months (n = 63) were more likely to have T4 disease and higher overall American Joint Committee on Cancer (AJCC) clinical stage at presentation (P < .01 for both). At 5 years, rates of overall survival, cancer-specific survival, progression-free survival, and distant metastases-free survival in the delayed diagnosis cohort were 80%, 90%, 80%, and 89%, respectively. A >12-month delay in diagnosis did not significantly impact overall survival (adjusted hazard ratio [aHR], 1.16; 95% CI, 0.58-2.31), cancer-specific survival (aHR, 0.83; 95% CI, 0.29-2.39), progression-free survival (aHR, 1.15; 95% CI, 0.56-2.37), or distant metastases-free survival (aHR, 1.00; 95% CI, 0.42-2.40) after adjusting for age, sex, and clinical AJCC stage (P > .05 for all). CONCLUSIONS: Delayed diagnosis of HPV(+)OPSCC is associated with greater burden of disease at presentation, but oncologic outcomes remain favorable across treatment modalities. When appropriate, intent-to-cure therapy should be pursued despite diagnostic delay. LEVEL OF EVIDENCE: Level III.