Predictors and prognostic importance of weight change in adult solid tumors.

2015 ◽  
Vol 33 (29_suppl) ◽  
pp. 103-103 ◽  
Author(s):  
Shiva Shrotriya ◽  
Declan Walsh ◽  
Aynur Aktas ◽  
Bassam N. Estfan
Keyword(s):  
Body Weight ◽  
Prognostic Factors ◽  
Head And Neck ◽  
Solid Tumors ◽  
Weight Change ◽  
Proportional Hazards ◽  
Cox Proportional Hazards ◽  
Cancer Center ◽  
Hormonal Therapies ◽  
Metastatic Sites

103 Background: Body weight change in adults with solid tumors was examined in outpatients. Objective was to determine if demographics, clinical and biochemical characteristics were associated with change in weight between visit 1 and visit 2. Examine if weight change and related parameters were associated with survival. Methods: Electronic medical records (EMR) from a tertiary cancer center retrospectively reviewed from 2009-2011. Body weight and other clinical parameters on visit 1 - within a year post diagnosis; visit 2 ≥3 weeks after visit 1. Weight change categorized as: weight gain, 0-5%, 5.01-10%, >10%. Ordinal logistic regression and Cox proportional hazards utilized for WL predictors and prognostic factors respectively. Results: N = 5,901; Mean age (±SD): 61 ± 12 years; 82% were Caucasians; 16% African Americans. Common cancers were prostate 19%; breast 15%; lung 15%; head and neck 6%; colorectal 6%; others 12%. Metastatic disease was present in 18%. Bone, brain, lymph nodes – were common metastatic sites. 45% had radiotherapy; 41% chemotherapy. Median weight change from visit 1 to visit 2 = -1 (-48, 66) kgs. Weight loss (WL) in 57% (≤5%: 30%, 5.01-10%: 13%, >10%: 14%). Different primary cancer sites, number of metastatic sites, radiotherapy/chemotherapy/hormonal therapies, older age, body mass index (BMI), and albumin predicted weight change. Median survival in 5.01-10.0% WL= 9.4 months, >10.0% = 5.3 months, and not observed ≤ 5%. Conclusions: 1. Majority lost ≤5% of body weight by visit 2. 2. Esophagus, head and neck, and pancreas (primary) - the greatest risk of WL; prostate – lowest. 3. High BMI predicted greater WL compared to normal or underweight. 4. ≤5% WL had a survival advantage compared to 5.01-10% and >10%. 5. WL remained prognostic for survival after adjusting for other prognostic factors.

Weight loss in solid tumors: Clinical features and prognostic importance.

2013 ◽  
Vol 31 (15_suppl) ◽  
pp. e20572-e20572
Author(s):  
Shiva Shrotriya ◽  
Aynur Aktas ◽  
Bassam N. Estfan ◽  
Lisa A. Rybicki ◽  
Declan Walsh
Keyword(s):  
Weight Loss ◽  
Body Weight ◽  
Head And Neck ◽  
Solid Tumors ◽  
Weight Change ◽  
Cancer Center ◽  
Clinical Parameters ◽  
Prognostic Importance ◽  
Biochemical Indices ◽  
Median Change

e20572 Background: Large cancer databases provide valuable information on weight change and its impact on different clinical parameters. Body weight change in adults with solid tumors was examined in outpatients. The objective was to determine if demographics, clinical and biochemical indices are predictive of weight loss (WL). The effect of WL and other parameters on survival were also assessed. Methods: Electronic medical records (EMR) for outpatient visits from a tertiary cancer center were retrospectively reviewed. Body weight and other clinical parameters on first visit (V1) - within a year post diagnosis - last visit (V2) ≥3 weeks after V1. WL at V2 from V1 categorized as: ≤5%, 5.01-10%, >10%. Results summarized by descriptive statistics, level of association and survival analysis. Results: N = 5901; Mean age (±SD): 61 ± 12 years; 82% were Caucasians; 16% African Americans. Common cancers were genitourinary (GU) 31%; gastrointestinal (GI) 16%; breast 15%; lung 15%; head and neck 6%; brain 5% and others 12%. Metastatic disease in 18%. Bone, brain, lymph nodes – common. 45% had radiotherapy and 41% chemotherapy. Median (min, max) weight, kgs: V1=81(32.0, 223), V2=79.4(34, 221). Median duration (min, max), days V1→V2: 195 (22, 1080). Weight loss V1→V2: ≤5% (73%), 5.01-10% (13%) and >10% (14%). Median change in BMI V1→V2: -0.2 (-19, 13). Median change systolic/diastolic blood pressure (BP) V1→V2: -3(-99, 80)/-1(-57, 47). Change in REE V1→V2: -13(-890, 365). Median survival for 5.01-10.0% WL= 9.4 months, >10.0% = 5.3 months and not observed for ≤ 5%. Conclusions: Majority lost ≤ 5% of body weight by V2. WL maximum for head and neck cancer and GI. High BMI predicted greater WL compared to normal or underweight. ≤5% WL had a survival advantage 5.01-10% and >10%. WL remained prognostic for survival even after adjusting for other prognostic factors.

Body weight loss (BWL) as a prognostic/predictive factor in previously treated patients (pts) with metastatic gastric or gastroesophageal junction cancer (mGC/GEJC): Post-hoc analyses of the phase III tags trial.

2021 ◽  
Vol 39 (3_suppl) ◽  
pp. 476-476
Author(s):  
Michele Ghidini ◽  
Howard S. Hochster ◽  
Toshihiko Doi ◽  
Eric Van Cutsem ◽  
Lukas Makris ◽  
...  
Keyword(s):  
Body Weight ◽  
Prognostic Factors ◽  
Proportional Hazards ◽  
Cox Model ◽  
Gastroesophageal Junction ◽  
Body Weight Loss ◽  
Cox Proportional Hazards ◽  
Phase Iii ◽  
Body Weight Data ◽  
Grade 3

476 Background: Nutritional status is closely linked to cancer mortality, and BWL has been shown to be prognostic for survival in curative, first-, and second-line settings in mGC/GEJC. In the phase III TAGS trial, trifluridine/tipiracil (FTD/TPI) showed clinical benefit versus placebo (PBO) and manageable safety in pts with mGC/GEJC who had received ≥2 prior chemotherapy regimens. The association of early BWL with survival outcomes in TAGS was examined in retrospective analyses. Methods: The TAGS intent-to-treat (ITT) population was categorized into pts who experienced <3% or ≥3% BWL from the start of treatment until day 1 of cycle 2 (each cycle: 28 days). Overall survival (OS), and progression-free survival (PFS) were compared between subgroups within each treatment arm due to significant imbalances of early BWL between treatment arms. The effect of early BWL on OS was assessed by a univariate Cox proportional hazards (PH) model as well as a multivariate Cox PH model that adjusted for baseline prognostic factors identified in the original ITT analysis. Results: Body weight data were available for 451 of 507 (89%) pts in the study (n=304, FTD/TPI; n=147, PBO). In the FTD/TPI and PBO arms, respectively, 74% (224/304 pts) and 65% (95/147) experienced <3% BWL, whereas 26% (80/304) and 35% (52/147) experienced ≥3% BWL at the end of cycle 1. Pts with <3% BWL had longer OS than those with ≥3% BWL in both FTD/TPI (median [m] OS: 6.5 vs 4.9 months [mo]; hazard ratio [HR], 0.75; 95% CI, 0.55–1.02) and PBO arms (mOS: 6.0 vs 2.5 mo; HR, 0.32; 95% CI, 0.21–0.49). The PFS HR for pts with <3% BWL vs ≥3% BWL was 0.95 (95% CI, 0.71–1.25; mPFS, 2.1 vs 1.9 mo) in the FTD/TPI group and 0.49 (95% CI, 0.34–0.72; mPFS, 1.9 vs 1.7 mo) in the PBO group. In the pooled ITT population, the unadjusted HR for the <3% vs ≥3% BWL group calculated using a univariate Cox model was 0.58 (95% CI, 0.46–0.73), indicating a strong prognostic effect of early BWL. Results of multivariate analyses were consistent with univariate analyses and suggested that early BWL was both a prognostic ( P<0.0001) and predictive (interaction P=0.0003) factor for OS in pts with mGC/GEJC. Grade ≥3 adverse events (AEs) of any cause were reported in 77% and 82% of FTD/TPI-treated pts in the <3% and ≥3% BWL subgroups, respectively, and in 45% and 67% of placebo-treated pts in the <3% and ≥3% BWL subgroups. Conclusions: To our knowledge, this is the first analysis to show that BWL is negatively associated with survival in pts with mGC/GEJC receiving third- or later-line treatment. In TAGS, early BWL (≥3% BWL at the end of cycle 1) was a strong negative prognostic factor for OS regardless of FTD/TPI or PBO treatment. Grade ≥3 AE frequencies were similar in FTD/TPI-treated pts with <3% or ≥3% BWL. The relationship of BWL to other prognostic factors will be explored further. Clinical trial information: NCT02500043.

scholarly journals Comparing the Characteristics and Predicting the Survival of Head and Neck Melanoma versus Body Melanoma: A Population-based Study

2021 ◽  
Author(s):  
Yuxin Ding ◽  
Runyi Jiang ◽  
Yuhong Chen ◽  
Jing Jing ◽  
Xiaoshuang Yang ◽  
...  
Keyword(s):  
Prognostic Factors ◽  
Head And Neck ◽  
Proportional Hazards ◽  
Population Based ◽  
Cox Proportional Hazards ◽  
Kaplan Meier ◽  
Cox Proportional Hazards Models ◽  
Great Consistency ◽  
Lentigo Maligna Melanoma ◽  
Head And Neck Melanoma

Abstract Background Previous studies have reported poorer survival in head and neck melanoma (HNM) than in body melanoma (BM). Individualized tools to predict the prognosis for patients with HNM or BM remain insufficient. Objectives To compare the characteristics of HNM and BM, and to establish and validate the nomograms for predicting the 3-, 5- and 10-year survival of patients with HNM or BM. Methods We studied patients with HNM or BM from 2004 to 2015 in the Surveillance, Epidemiology, and End Results (SEER) database. The HNM group and BM group were randomly divided into training and validation cohorts. We performed the Kaplan-Meier method for survival analysis, and used multivariate Cox proportional hazards models to identify independent prognostic factors. Nomograms for HNM patients or BM patients were developed via the rms package, and were measured by the concordance index (C-index), the area under the receiver operator characteristic (ROC) curve (AUC) and calibration plots. Results Of 70605 patients acquired, 21% (n = 15071) had HNM and 79% (n = 55534) had BM. The HNM group contained more older patients, male patients, and lentigo maligna melanoma, and more frequently had thicker tumors and metastases than the BM group. The 5-year CSS and OS rates were 88.1 ± 0.3% and 74.4 ± 0.4% in the HNM group and 92.5 ± 0.1% and 85.8 ± 0.2% in the BM group, respectively. Eight independent prognostic factors (age, sex, histology, thickness, ulceration, stage, metastases, and surgery) were identified to construct nomograms for HNM patients or BM patients. The performance of the nomograms were excellent: the C-index of the CSS prediction for HNM patients and BM patients in the training cohort were 0.839 and 0.895, respectively; in the validation cohort, they were 0.848 and 0.888, respectively; the AUCs for the 3-, 5- and 10-year CSS rates of HNM were 0.871, 0.865 and 0.854 (training), and 0.881, 0.879 and 0.861 (validation), respectively; of BM, the AUCs were 0.924, 0.918 and 0.901 (training) and 0.916, 0.908 and 0.893 (validation), respectively; and the calibration plots showed great consistency. Conclusions The characteristics of HNM and BM are heterogeneous, and we constructed and validated specific nomograms as practical prognostic tools for patients with HNM or BM.

Association of multidimensional comorbidities with survival in elderly patients with metastatic colorectal cancer treated with chemotherapy.

2017 ◽  
Vol 35 (15_suppl) ◽  
pp. e21530-e21530
Author(s):  
Ki Hyang Kim ◽  
Jae Jin Lee ◽  
Jongphil Kim ◽  
Fabio Renato Morgado Gomes ◽  
Marina Sehovic ◽  
...  
Keyword(s):  
Colorectal Cancer ◽  
Prognostic Factors ◽  
Proportional Hazards ◽  
Rating Scale ◽  
Univariate Analysis ◽  
Cox Proportional Hazards ◽  
Age At Diagnosis ◽  
Cancer Center ◽  
Ecog Ps ◽  
The Impact

e21530 Background: In geriatric assessments, comorbidity is often assessed with tools such as the Charlson comorbidity index (CCI) and the Cumulative Illness Rating Scale-Geriatrics (CIRS-G). In studies of older patients with colorectal cancer (CRC), comorbidity was mainly measured using the CCI, and inconsistent results about the correlation comorbidity with overall survival (OS) were found. In order to refine our understanding of the impact of comorbidity, we evaluated its correlation with OS using the CIRS-G and heat maps to elicit the subgroups with the highest impact. Methods: We retrospectively reviewed 153 consecutive patients from the Total Cancer Care database, aged ≥65 with stage 4 CRC, who underwent chemotherapy at Moffitt Cancer Center from 2000 to 2015. The association between CIRS-G scores and OS was examined by the Cox proportional hazards regression model. Results: Median age at diagnosis was 71 years. Forty-eight % of patients had an ECOG PS of 0. Median MAX2 score of chemotherapies was 0.119. Median total score of CIRS-G was 8 (1-20) and median severity index was 0.57 (0.07-1.43). The most common comorbidities were vascular, EENT and larynx, and respiratory diseases. Eleven patients had 1 comorbidity and 1 patient had 2 comorbidities at level 4 severity. Median OS of all patients was 25.1 months (95% CI 21.2-27.6). In univariate analysis, the number of CIRS-G level 4 comorbidities was a significant worse prognostic factor for OS (0 vs 1 or 2, HR 2.16, p = 0.017). In multivariate analysis, ECOG PS ≥2, poorly differentiated histology, age at diagnosis and numbers of CIRS-G level 4 comorbidities were significant worse prognostic factors for OS. ECOG PS ≥2 and age at diagnosis were significant worse prognostic factors for unplanned hospitalization. Conclusions: The OS in the elderly metastatic CRC patients was good and similar to the general population with this disease. The number of CIRS-G level 4 comorbidities was associated with worse OS but no specific CIRS-G category was individually associated with OS.

Pretreatment hemoglobin level influences local control and survival of T1-T2 squamous cell carcinomas of the glottic larynx.

1995 ◽  
Vol 13 (8) ◽  
pp. 2077-2083 ◽  
Author(s):  
D A Fein ◽  
W R Lee ◽  
A L Hanlon ◽  
J A Ridge ◽  
C J Langer ◽  
...  
Keyword(s):  
Radiation Therapy ◽  
Head And Neck ◽  
Local Control ◽  
Squamous Cell ◽  
Proportional Hazards ◽  
Survival Rates ◽  
Local Control Rate ◽  
Cox Proportional Hazards ◽  
Hemoglobin Level ◽  
Cancer Center

PURPOSE A number of reports have documented the relationship between pretreatment hemoglobin level and local control and/or survival in the treatment of cervix, bladder, and advanced head and neck tumors. Consideration of correcting anemia before initiation of radiation therapy may prove increasingly important as clinical trials use intensive induction chemotherapy in the treatment of head and neck carcinomas. Neoadjuvant chemotherapy may produce anemia, which in turn may reduce the effectiveness of subsequent irradiation. MATERIALS AND METHODS One hundred nine patients with T1-2N0 squamous cell carcinoma of the glottic larynx were treated with definitive radiotherapy at the Fox Chase Cancer Center between June 1980 and November 1990. Follow-up times ranged from 26 to 165 months (median, 82). RESULTS The 2-year local control rate for patients who presented with a hemoglobin level < or = 13 g/dL was 66%, compared with 95% for patients with a hemoglobin level more than 13 g/dL (P = .0018). The 2-year survival rate for patients with a hemoglobin level < or = 13 g/dL was 46%, compared with 88% for patients with a hemoglobin level more than 13 g/dL (P < .001). Cox proportional hazards regression analysis showed that hemoglobin level (P = .0016) was the only variable that significantly influenced local control (P = .0016) and survival (P < .0001). CONCLUSION Patients who presented with hemoglobin levels more than 13 g/dL had significantly higher local control and survival rates. The strong apparent correlation between hemoglobin level, local control, and survival supports consideration of correcting anemia before initiation of radiation therapy.

scholarly journals BIOM-05. CIRCULATING TUMOR CELLS (CTC) IN CEREBROSPINAL FLUID (CSF) AS A PREDICTOR OF SURVIVAL IN CNS METASTASES

2020 ◽  
Vol 22 (Supplement_2) ◽  
pp. ii2-ii2
Author(s):  
Maria Diaz ◽  
Priya Singh ◽  
Ivan Kotchetkov ◽  
Anna Skakodub ◽  
Anne Reiner ◽  
...  
Keyword(s):  
Solid Tumors ◽  
Proportional Hazards ◽  
Recursive Partitioning ◽  
Cox Proportional Hazards ◽  
Molecular Profile ◽  
Cancer Center ◽  
Cns Metastases ◽  
Optimal Cutoff ◽  
Risk Of Death ◽  
Tumor Types

Abstract BACKGROUND CSF-CTC testing using the CellSearch® platform is a validated diagnostic tool for leptomeningeal metastases (LM) from solid tumors. CSF-CTCs can also be detected in patients with brain metastases (BM), but their significance is unclear. Our objective was to evaluate the utility of CSF-CTC quantification in predicting outcomes in CNS metastases. METHODS We retrospectively reviewed charts of patients with solid tumors who underwent CSF-CTC measurement between 2016–2019 at Memorial Sloan Kettering Cancer Center. Information on neuroaxis imaging, CSF results, systemic cancer status, tumor molecular profile and survival was collected. LM was diagnosed by MRI and/or CSF cytology. Survival analyses were performed using Cox proportional hazards modeling, and CSF-CTC splits associated with survival were identified through recursive partitioning analysis (RPA). RESULTS A total of 407 patients (38% lung primary, 34% breast, 28% other tumor types) were included; of these, 144 had LM and 233 had BM diagnosed before or around the time of CSF tests (97 had both). For a subgroup of 101 patients with LM diagnosed within 30 days of CSF sampling, mean CSF-CTCs were 127.3/3ml, compared to 44.6/3ml in the overall cohort. CSF-CTCs predicted survival in these patients, with optimal cutoff at 61 CSF-CTCs/3ml, above which the risk of death doubled (HR=2.09, 95% CI: 1.13–3.87, p=0.02). For 53 patients with BM diagnosed 1–6 months prior to CSF tests, CSF-CTCs (mean 54.1/3ml) also determined higher risk of death when above the optimal cutoff of 94 (HR=5.15, 95% CI: 2.08–12.78, p=0.004). For both groups, positive/suspicious cytology was associated with higher risk of death as well, but these results were not statistically significant (LM group: HR=1.79, 95% CI: 0.95–3.35, p=0.07; BM group: HR=1.86, 95%CI: 0.82–4.22, p=0.14). CONCLUSION In newly diagnosed LM and BM, quantification of CSF-CTCs predicts survival. CSF-CTC analysis can be used as a prognostic tool in patients with CNS metastases.

Overall survival (OS) prognostic factors in metastatic castrate-resistant prostate cancer (mCRPC) patients retreated with docetaxel (D).

2012 ◽  
Vol 30 (15_suppl) ◽  
pp. e15213-e15213
Author(s):  
Shilpa Rashmikant Shah ◽  
Costantine Albany ◽  
Noah M. Hahn
Keyword(s):  
Prognostic Factors ◽  
Proportional Hazards ◽  
Proportional Hazards Model ◽  
Cox Proportional Hazards ◽  
Cox Proportional Hazards Model ◽  
Cancer Center ◽  
Gleason Grade ◽  
First Line ◽  
Hazards Model ◽  
Baseline Psa

e15213 Background: Until recently, few post-D treatment options existed for mCRPC patients (pts). In pts taken off of first-line D for reasons other than progressive disease (PD), retreatment with D at the time of PD was a commonly used strategy. While several prognostic nomograms have been developed for mCRPC patients, none have exclusively examined prognostic factors in D retreated patients. In the present study, we aimed to characterize baseline clinical factors associated with OS outcomes in D retreated mCRPC pts. Methods: Between 1/2007 and 10/2010, all mCRPC pts seen in the Indiana University Simon Cancer Center oncology clinics were approached for recruitment to the IRB approved biorepository protocol. Participants completed a demographic and clinical questionnaire and provided a blood sample. Only mCRPC pts retreated with D with confirmed dates for D first-line completion, D retreatment, and OS were included in this analysis. At D retreatment, patient age, Gleason Grade (GG), presence of pain, time to progression after first-line D therapy, visceral metastases, ECOG performance status, PSA, and PSA doubling time (PSAdt) were examined by Cox proportional hazards model for significant associations (p < 0.05) with OS outcomes. Results: 30 mCRPC pts retreated with D were identified. Complete data were available on 22 pts which formed the analysis cohort. Demographics included: mean age – 69.1 yrs, Caucasian/African-American – 21/1, median GG 8, 55% pain present at baseline, median time from first-line D – 8.6 mo., 30% visceral mets, ECOG 0/1/2 – 3/17/2, mean baseline PSA – 536 ng/ml, mean baseline PSAdt – 2.7 mo. By Cox proportional hazards model, baseline PSA (p = 0.006) was significantly associated with D-retreatment OS with a trend toward significance in patients with pain at baseline (p = 0.059). No other significant associations were identified. Conclusions: Baseline PSA levels were significantly associated with OS outcomes in mCRPC pts retreated with D. Validation and examination of additional clinical variables is warranted in larger datasets.

Clinical behavior of stage IVC squamous cell carcinoma of the head and neck.

2017 ◽  
Vol 35 (15_suppl) ◽  
pp. e17511-e17511
Author(s):  
Vanessa Wookey ◽  
Adams Kusi Appiah ◽  
Avyakta Kallam ◽  
Vinicius Ernani ◽  
Lynette Smith ◽  
...  
Keyword(s):  
Squamous Cell Carcinoma ◽  
Prognostic Factors ◽  
Cell Carcinoma ◽  
Head And Neck ◽  
Squamous Cell ◽  
Proportional Hazards ◽  
Private Insurance ◽  
Univariate Analysis ◽  
Cox Proportional Hazards ◽  
Rank Test

e17511 Background: Squamous cell carcinoma of the head and neck (HNSCC) with distant metastasis at diagnosis (stage IVC) is rare, and outcomes are often lumped together with those of patients who relapse following initial treatment. We evaluated prognostic factors in patients presenting with stage IVC HNSCC. Methods: Data was extracted from the National Cancer Database to determine prevalence, overall survival (OS), and prognostic factors of stage IVC HNSCC (oral cavity, gum, lip, oropharynx, tongue, tonsil and hypopharynx) in adults, using SAS software for analysis. OS curves were estimated using the Kaplan-Meier method and differences were compared using a log-rank test. Significant parameters in the univariate Cox proportional hazards regression model analyses were included in the multivariate model, and hazard ratios, p-values and 95% confidence intervals were presented. Results: Of 226,302 patients with HNSCC, 5458 had distant metastases at diagnosis (2.40%); 5238 had complete data and were included in further analyses. Median survival of the entire cohort was 9.07 months, and one-year survival was 41%. Age > 70 years, Black race and higher Charlson-Deyo comorbidity score were associated with worse OS, while HPV positive status, tonsil and tongue (not including base) primary, private insurance and receipt of any treatment were associated with improved OS on univariate analysis. In multivariate analysis, HPV positive tumors were associated with improved OS compared to HPV negative tumors (HR 0.63, 95% CI 0.48-0.82; p= 0.001), even after adjusting for site of tumor origin. Only patients with a Charlson-Deyo score of ≥2 had worse OS compared to those without comorbidities. Hypopharynx, lip, tonsil and base of tongue primaries had significantly worse OS compared to gum and other mouth. Except for radiation alone and radiation with surgery, treatment demonstrated significant improvement in OS compared to no treatment, a combination of chemotherapy, radiation and surgery provided the largest survival benefit (HR 0.23, 95% CI 0.20-0.28). Conclusions: HPV positivity seems to predict for better prognosis, regardless of site of origin. Patients with metastatic HNSCC should be offered multimodality therapy in order to improve outcomes.

scholarly journals Conventional dose rate spatially-fractionated radiation therapy (SFRT) treatment response and its association with dosimetric parameters – A preclinical study in a Fisher 344 rat model

2020 ◽  
Author(s):  
Judith N. Rivera ◽  
Thomas M. Kierski ◽  
Sandeep K. Kasoji ◽  
Anthony S. Abrantes ◽  
Paul A. Dayton ◽  
...  
Keyword(s):  
Body Weight ◽  
Treatment Response ◽  
Weight Change ◽  
Proportional Hazards ◽  
Tumor Response ◽  
Cox Proportional Hazards ◽  
Average Dose ◽  
Body Weight Change ◽  
Conventional Dose ◽  
Peak Dose

AbstractPurposeTo identify key dosimetric parameters that have close associations with tumor treatment response and body weight change in SFRT treatments with a large range of spatial-fractionation scale at dose rates of several Gy/min.MethodsSix study arms using uniform tumor radiation, half-tumor radiation, 2mm beam array radiation, 0.3mm minibeam radiation, and an untreated arm were used. All treatments were delivered on a 320kV x-ray irradiator. Forty-two female Fischer 344 rats with fibrosarcoma tumor allografts were used. Dosimetric parameters studied are peak dose and width, valley dose and width, peak-to-valley-dose-ratio, volumetric average dose, percentage volume directly irradiated, and tumor- and normal-tissue EUD. Animal survival, tumor volume change, and body weight change (indicative of treatment toxicity) are tested for association with the dosimetric parameters using linear regression and Cox Proportional Hazards models.ResultsThe dosimetric parameters most closely associated with tumor response are tumor EUD (R2=0.7923, F-stat=15.26*; z-test=−4.07***), valley/minimum dose (R2=0.7636, F-stat=12.92*; z-test=−4.338***), and percentage tumor directly irradiated (R2=0.7153, F-stat=10.05*; z-test=−3.837***) per the linear regression and Cox Proportional Hazards models, respectively. Tumor response is linearly proportional to valley/minimum doses and tumor EUD. Average dose (R2=0.2745, F-stat=1.514 (no sig.); z-test=−2.811**) and peak dose (R2=0.04472, F-stat=0.6874 (not sig.); z-test=−0.786 (not sig.)) show the weakest associations to tumor response. Only the uniform radiation arm did not gain body weight post-radiation, indicative of treatment toxicity; however, body weight change in general shows weak association with all dosimetric parameters except for valley/min dose (R2=0.3814, F-stat=13.56**), valley width (R2=0.2853, F-stat=8.783**), and peak width (R2=0.2759, F-stat=8.382**).ConclusionsFor a single-fraction SFRT at conventional dose rates, valley, not peak, dose is closely associated with tumor treatment response and thus should be used for treatment prescription. Tumor EUD, valley/min dose, and percentage tumor directly irradiated are the top three dosimetric parameters that exhibited close associations with tumor response.

scholarly journals Comparing the Characteristics and Predicting the Survival of Head and Neck Melanoma versus Body Melanoma: A Population-based Study

2021 ◽  
Author(s):  
Yuxin Ding ◽  
Runyi Jiang ◽  
Yuhong Chen ◽  
Jing Jing ◽  
Xiaoshuang Yang ◽  
...  
Keyword(s):  
Prognostic Factors ◽  
Head And Neck ◽  
Proportional Hazards ◽  
Population Based ◽  
Cox Proportional Hazards ◽  
Kaplan Meier ◽  
Cox Proportional Hazards Models ◽  
Great Consistency ◽  
Lentigo Maligna Melanoma ◽  
Head And Neck Melanoma

Abstract Background: Previous studies have reported poorer survival in head and neck melanoma (HNM) than in body melanoma (BM). Individualized tools to predict the prognosis for patients with HNM or BM remain insufficient. We aim to compare the characteristics of HNM and BM, and establish and validate the nomograms for predicting the 3-, 5- and 10-year survival of patients with HNM or BM.Methods: We studied patients with HNM or BM from 2004 to 2015 in the Surveillance, Epidemiology, and End Results (SEER) database. The HNM group and BM group were randomly divided into training and validation cohorts. We performed the Kaplan-Meier method for survival analysis, and used multivariate Cox proportional hazards models to identify independent prognostic factors. Nomograms for HNM patients or BM patients were developed via the rms package, and were measured by the concordance index (C-index), the area under the receiver operator characteristic (ROC) curve (AUC) and calibration plots.Results: Of 70605 patients acquired, 21% (n=15071) had HNM and 79% (n=55534) had BM. The HNM group contained more older patients, male patients, and lentigo maligna melanoma, and more frequently had thicker tumors and metastases than the BM group. The 5-year CSS and OS rates were 88.1±0.3% and 74.4±0.4% in the HNM group and 92.5±0.1% and 85.8±0.2% in the BM group, respectively. Eight independent prognostic factors (age, sex, histology, thickness, ulceration, stage, metastases, and surgery) were identified to construct nomograms for HNM patients or BM patients. The performance of the nomograms were excellent: the C-index of the CSS prediction for HNM patients and BM patients in the training cohort were 0.839 and 0.895, respectively; in the validation cohort, they were 0.848 and 0.888, respectively; the AUCs for the 3-, 5- and 10-year CSS rates of HNM were 0.871, 0.865 and 0.854 (training), and 0.881, 0.879 and 0.861 (validation), respectively; of BM, the AUCs were 0.924, 0.918 and 0.901 (training) and 0.916, 0.908 and 0.893 (validation), respectively; and the calibration plots showed great consistency.Conclusions: The characteristics of HNM and BM are heterogeneous, and we constructed and validated specific nomograms as practical prognostic tools for patients with HNM or BM.

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