Relationship between changes in serum androgen level measured by LC-MS/MS and therapeutic effect after enzalutamide treatment.

2021 ◽  
Vol 39 (6_suppl) ◽  
pp. 88-88
Author(s):  
Yoshiyuki Miyazawa ◽  
Toshiyuki Nakamura ◽  
Yutaka Takezawa ◽  
Nobuaki Shimizu ◽  
Yasushige Matsuo ◽  
...  

88 Background: Enzalutamide (ENZ) has proven efficacy against castration-resistant prostate cancer (CRPC) and is widely used in treatment. However, no useful biomarkers have yet been reported to predict the effects of ENZ. We examined the relationship between the efficacy of ENZ and changes in serum androgen levels after ENZ administration. Methods: This exploratory research was based on the data from our prospective clinical trial. Of a total of 104 cases, 67 with confirmed changes in androgen levels after 3 months of ENZ administration, compared to pretreatment levels, were included in this study to identify prognostic factors. Serum androgen levels were measured by liquid chromatography-mass spectrometry (LC-MS/MS). This study was approved by the institutional review board of Gunma University Hospital (No.1177). Results: The study population of 67 patients had a median age of 73 years. The median serum levels of testosterone (T), dihydrotestosterone (DHT), androstenedione (A-dione), and dehydroepiandrosterone sulfate (DHEA-S) before treatment were 56.8 pg/ml, 7.8 pg/ml, 253.5 pg/ml, and 502.2 pg/ml, respectively. The median increase rate(%) of T, DHT, A-dione andDHEA-S after 3 months of ENZ administration were +55.5%, +49.5%, +25.8%, and +24.9%, respectively. T, DHT, and A-dione levels were significantly increased after 3 months (p < 0.05). We performed Cox regression analysis to predict PSA-PFS and OS. Hemoglobin (Hb, ≥ 12.5 g/dl vs. < 12.5 g/dl) and T increase rate ( < 55.5% vs. ≥ 55.5%) were significant predictors of PSA-PFS (p < 0.05). ECOG performance status (0 vs. 1 - 2, respectively) and Hb (≥ 12.5 vs. < 12.5 g/dl, respectively) and T ( < 55.5% vs. ≥55.5%) were significant predictors of OS (p < 0.05). Conclusions: PSA-PFS and OS were significantly poor in the cases in which T increased significantly 3 months after ENZ administration. It was suggested that the change of hormonal environment after ENZ administration may be a prognostic factor.

2020 ◽  
Vol 38 (6_suppl) ◽  
pp. 146-146
Author(s):  
Yoshiyuki Miyazawa ◽  
Takeshi Miyao ◽  
Toshiyuki Nakamura ◽  
Yutaka Takezawa ◽  
Nobuaki Shimizu ◽  
...  

146 Background: Enzalutamide (ENZ) is commonly used to treat patients with castration resistant prostate cancer (CRPC). However, the kinetics of serum androgen levels before and after ENZ treatment are unknown. We elucidated the kinetics of serum androgens and explored the possibility of identifying a useful marker for predicting the effects of ENZ. Methods: We conducted a prospective study from 2014 to 2018 at Gunma University Hospital and related facilities. 104 CRPC patients treated with ENZ were analyzed. We investigated the PSA reduction rate (50%, 90%), PSA-progression-free survival (PFS), and overall survival (OS) after administration. To measure levels of androgens accurately we measured serum androgen levels using LC-MS/MS. OS and PSA-PFS were assessed according to the PCWG 2 criteria. This study was approved by the Institutional Review Board of Gunma University Hospital (No. 1177). Results: The 50% and 90% PSA decline rates were 62.5% and 25.0%, respectively. Median serum testosterone (T), dihydrotestosterone (DHT), androstenedione (A-dione), and dehydroepiandrosterone-sulfate levels were 49.0, 5.8, 222.2, and 326.3 pg/ml, respectively. Mean serum levels of T, DHT, and A-dione increased significantly 12 and 24 weeks after compared to before treatment (p < 0.05). We performed a multivariate analysis using a Cox regression to predict OS and PSA-PFS. ECOG PS (0 vs. 1–2), hemoglobin (Hb ≥ 12.5 vs. < 12.5 g/dL), albumin (≥ 3.9 vs. < 3.9 g/dL), visceral metastasis (no vs. yes), EOD (0–2 vs. 3–4), docetaxel treatment (no vs. yes), and DHT level (≥11.25 vs. < 11.25 pg/mL, 11.25 was third quartile) were significant predictors of OS (p < 0.05). Hb (≥12.5 vs. < 12.5 g/dL), docetaxel treatment (no vs. yes), and level of DHT (≥ 5.9 vs. < 5.9 pg/mL) were significant predictors of PSA-PFS (p < 0.05). As a result of the binomial logistic analysis of the predictors of fatigue and decreased appetite, the presence of visceral metastasis (yes) and low DHT (<5.9 pg/mL) were significant predictors of expression. Conclusions: These results suggest that serum androgen levels before ENZ treatment may be useful for predicting efficacy, prognosis, and the incidence of adverse events.


2017 ◽  
Vol 35 (15_suppl) ◽  
pp. 3051-3051 ◽  
Author(s):  
Yukiya Narita ◽  
Keiji Sugiyama ◽  
Seiichiro Mitani ◽  
Kazunori Honda ◽  
Toshiki Masuishi ◽  
...  

3051 Background: Anti-PD-1 monotherapy has proven effective for the patients (pts) with MGC. However, the identification of biomarkers for predicting clinical outcomes remain as critical needs. We aimed to identify baseline characteristics associated with time to treatment failure (TTF) or overall survival (OS) for anti-PD-1/PD-L1 monotherapy as second- or later-line therapy in MGC. Methods: Routine blood count parameters and clinical characteristics at baseline were retrospectively investigated in 31 pts with MGC in Aichi Cancer Center Hospital. Endpoints were TTF and OS following anti-PD-1/PD-L1 monotherapy. Kaplan-Meiyer and Cox regression analysis were applied for survival analyses. Results: Patient characteristics were as follows: median age (range), 68 (47–83); ECOG performance status (PS) 0/1, 21/10; PM +ve/-ve, 12/19; No. of metastatic sites 1–2/≥3, 18/13; No. of prior chemotherapy regimens 1–2/≥3, 11/20; and absolute eosinophil count (AEC) <150/≥150 /μl, 14/17. Objective response rate and disease control rate (RECIST ver. 1.1) were 26% vs. 0% (odds ratio [OR], 3.76; P = 0.12) and 79% vs. 50% (OR, 3.58; P = 0.12) in the PM -ve group (Cohort A) and the PM +ve group (Cohort B), respectively. On univariate analysis, the pts with poor PS, PM +ve, and high AEC were significantly poor TTF; and poor PS and PM +ve were significantly identified as prognostic factors of poor OS. On multivariate analysis, only PM +ve was independent negative impact not only for TTF but also for OS. Median TTF and OS were 5.4 vs. 1.3 months (M) (adjusted hazard ratio [HR], 4.29; 95%CI, 1.60–11.5; P < 0.01) and 28.2 vs. 7.5 M (adjusted HR, 3.68; 95%CI, 1.25–10.8; P = 0.02) in Cohort A and Cohort B. Six-months TTF probabilities of 42% vs. 0% ( P = 0.03) and one-year OS probabilities of 58% vs. 8% ( P< 0.01) were observed in Cohort A compared to in Cohort B. Conclusions: PM -ve in the pts treated with anti-PD-1/PD-L1 monotherapy was associated with better efficacy. In the pts with PM -ve, anti-PD-1/PD-L1 monotherapy could be adapted in first-line therapy. [Table: see text]


2017 ◽  
Vol 35 (15_suppl) ◽  
pp. e16521-e16521
Author(s):  
Orazio Caffo ◽  
Emilio Bria ◽  
Ugo De Giorgi ◽  
Marcello Tucci ◽  
Elisa Biasco ◽  
...  

e16521 Background: High NLR has been reported to be a poor prognostic indicator in both first and second mCRPC lines, while no information is available concerning this issue in pts treated in third line therapy. The present study is aimed to assess the possible relationship between third line clinical outcomes and NLR in a series of mCRPC pts treated with a NA [abiraterone acetate (AA), cabazitaxel (CABA), or enzalutamide (ENZ)] after the failure of docetaxel (DOC) and another NA. Methods: We collected data of pts who received sequentially two NAs after DOC in 38 Italian hospitals. For each pt we recorded the clinical outcome of all treatments received after DOC. Cox regression analysis was used to assess the independent prognostic value of a series of pretreatment covariates, in terms of overall survival (OS), comprising NLR. Results: A consecutive series of 476 mCRPC pts with bone (86%), nodal (56%) or visceral (15%) mets, was collected. All pts received a NA-based third line: 135 received AA, 221 CABA and 120 ENZ. Data on NLR were available for 398 pts (84%). In the univariate analyses, the NLR as a discrete variable dichotomized according to the Maximally Selected Log-Rank statistics (optimal cut-off: 3.66), was significantly associated with both OS and progression free survival (PFS), calculated from the third line start (p < 0.0001). At the multivariate analysis, NLR, performance status, pain, hemoglobin, alkaline phosphatase, treatment with AA and with CABA were independent prognostic factors for PFS, while NLR, performance status, hemoglobin, PSA, and lactate dehydrogenase were independent prognostic factors for OS. In Kaplan-Meier analysis, the median OS from the start of third-line was higher (14.2 vs 9.3 mos) in pts with NLR ≤ 3.1 compared to those with NLR > 3.1 (log-rank; P < 0.0001). Similarly, the median PFS was 5.5 and 3.8 (log-rank; P < 0.0001) in pts with NLR ≤ 3.66 and > 3.66, respectively. Conclusions: Our results, observed in the largest cohort of mCRCP pts treated with NA-based third line after DOC and another NA, confirms that NLR is an independent factor for PFS and OS also in this population.


2017 ◽  
Vol 35 (6_suppl) ◽  
pp. 230-230
Author(s):  
Orazio Caffo ◽  
Emilio Bria ◽  
Ugo De Giorgi ◽  
Marcello Tucci ◽  
Luca Galli ◽  
...  

230 Background: High NLR has been reported to be a poor prognostic indicator in both first and second mCRPC lines, while no information is available concerning this issue in pts treated in third line therapy. The present study is aimed to assess the possible relationship between third line clinical outcomes and NLR in a series of mCRPC pts treated with a NA [abiraterone acetate (AA), cabazitaxel (CABA), or enzalutamide (ENZ)] after the failure of docetaxel (DOC) and another NA. Methods: We collected data of pts who received sequentially two NAs after DOC in 38 Italian hospitals. For each pt we recorded the clinical outcome of all treatments received after DOC. Cox regression analysis was used to assess the independent prognostic value of a series of pretreatment covariates, in terms of overall survival (OS), comprising NLR. Results: A consecutive series of 476 mCRPC pts with bone (86%), nodal (56%) or visceral (15%) mets, was collected. All pts received a NA-based third line: 135 received AA, 221 CABA and 120 ENZ. Data on NLR were available for 398 pts (84%). In the univariate analyses, the NLR as a discrete variable dichotomized according to the Maximally Selected Log-Rank statistics (optimal cut-off: 3.66), was significantly associated with both OS and progression free survival (PFS), calculated from the third line start (p < 0.0001). At the multivariate analysis, NLR, performance status, pain, hemoglobin, alkaline phosphatase, treatment with AA and with CABA were independent prognostic factors for PFS, while NLR, performance status, hemoglobin, PSA, and lactate dehydrogenase were independent prognostic factors for OS . In Kaplan-Meier analysis, the median OS from the start of third-line was higher (14.2 vs 9.3 mos) in pts with NLR ≤ 3.1 compared to those with NLR > 3.1 (log-rank; P < 0.0001). Similarly, the median PFS was 5.5 and 3.8 (log-rank; P < 0.0001) in pts with NLR ≤ 3.66 and > 3.66, respectively. Conclusions: Our results, observed in the largest cohort of mCRCP pts treated with NA-based third line after DOC and another NA, confirms that NLR is an independent factor for PFS and OS also in this population.


Blood ◽  
2016 ◽  
Vol 128 (22) ◽  
pp. 2004-2004
Author(s):  
Athanasios Galanopoulos ◽  
Christos K. Kontos ◽  
Nora-Athina Viniou ◽  
Ioannis Kotsianidis ◽  
Vassiliki Pappa ◽  
...  

Abstract Introduction - Aims: Several prognostic scoring systems have been developed for patients with myelodysplastic syndromes (MDS), including the International Prognostic System (IPSS), the WHO Prognostic Scoring System (WPSS) and the Revised IPSS (IPSS-R). We evaluated the prognostic value of the IPSS-R on an independent group of 2,582 Greek patients with MDS, registered in the Hellenic National MDS Registry. The aim of this multicenter study was to validate the IPSS-R as a predictor for leukemia-free survival (LFS) and overall survival (OS), in newly-diagnosed MDS patients and to compare its prognostic significance with that of IPSS and WPSS. Moreover, to investigate the predictive value of IPSS-R in association with other recognized prognostic variables, such as patient's age, baseline serum lactate dehydrogenase (LDH), and ferritin concentrations, IPSS, WPSS, Eastern Cooperative Oncology Group (ECOG) performance status, transfusion dependency, and response to first-line treatment. Methods: Clinicopathological data from 2,582 MDS patients, diagnosed between 1/2000 - 1/2015 and registered in the Hellenic National MDS Registry were analyzed. Patients with MDS/MPN were excluded. Data included age, gender, date of diagnosis, clinical characteristics, WHO-2008 classification, laboratory parameters, transfusion dependency, bone marrow aspirate and biopsy morphology, cytogenetic findings, and type of treatment. LFS was calculated from the date of initial diagnosis of MDS until bone marrow blast increased to ≥20% [transformation to acute myeloid leukemia (AML), according to the WHO classification], or last contact. OS was defined as the time from MDS diagnosis to death, or last contact. Patients alive and not having developed AML until last follow-up were censored for OS and LFS, respectively. Kaplan-Meier survival analysis and Cox regression analysis were performed with regard to LFS and OS. Differences between Kaplan-Meier curves were evaluated using the Mantel-Cox (log-rank) test. All significant variables identified by univariate Cox regression analysis and clinical factors important for MDS were used to build the multivariate Cox regression models. Multivariate Cox regression analysis included only those patients for whom the status of all variables was known, and comprised age, serum LDH, and ferritin levels, transfusion dependency, response to first-line treatment, IPSS, WPSS, and IPSS-R. Confidence intervals (CI) were estimated at the 95% level; all tests were two-sided, accepting p<0.05 as indicative of a statistically significant difference. All statistical analyses were performed with the statistical software SPSS (version 21). Results: 1,623 male (62.9%) and 959 female MDS patients with a median age of 74 years at diagnosis were included in the current study. Complete follow-up information was available for 2,376 patients. The estimated median OS was 58 months (95% CI = 52.9 - 63.1 months). For 1,974 patients, data used in the calculation of all three scoring systems were complete, thus allowing risk score calculation and comparison of the three risk assessment systems. Median OS was significantly different in patient subgroups classified according to IPSS, WPSS, and IPSS-R, as shown by the Kaplan-Meier survival analysis (p<0.001). Fig. 1 shows Kaplan-Meier OS curves of MDS patients stratified according to IPSS-R (p<0.001). Moreover, the comparison of the prognostic value of the IPSS, WPSS, and IPSS-R revealed that the IPSS-R was significantly superior to both, WPSS and IPSS (p<0.001 in all cases). Multivariate Cox regression analysis demonstrated that the high prognostic value of IPSS-R, in terms of LFS and OS, was independent of patient's age, serum LDH, and ferritin concentration, ECOG performance status, and transfusion dependency (p<0.001). Interestingly, besides IPSS-R, patient age and transfusion dependency retain their small - yet significant - prognostic impact in the multiparametric models, thus implying that these two parameters could add prognostic value to the IPSS-R. Conclusions: Our data support the notion that all three prognostic scores are very useful predictors for both, LFS and OS in MDS, yet IPSS-R is superior to IPSS and WPSS as a prognostic tool, with regard to OS. Disclosures No relevant conflicts of interest to declare.


2021 ◽  
Vol 11 ◽  
Author(s):  
Armita Armina Abedi ◽  
Kirsten Grunnet ◽  
Ib Jarle Christensen ◽  
Signe Regner Michaelsen ◽  
Aida Muhic ◽  
...  

BackgroundGlioblastoma patients administered standard therapies, comprising maximal surgical resection, radiation therapy with concomitant and adjuvant temozolomide, have a variable prognosis with a median overall survival of 15–16 months and a 2-year overall survival of 30%. The aim of this study was to develop a prognostic nomogram for overall survival for glioblastoma patients treated with standard therapy outside clinical trials.MethodsThe study included 680 consecutive, non-selected glioblastoma patients administered standard therapy as primary treatment between the years 2005 and 2016 at Rigshospitalet, Copenhagen, Denmark. The prognostic model was generated employing multivariate Cox regression analysis modeling overall survival.ResultsThe following poor prognostic factors were included in the final prognostic model for overall survival: Age (10-year increase: HR = 1.18, 95% CI: 1.08–1.28, p &lt; 0.001), ECOG performance status (PS) 1 vs. 0 (HR = 1.30, 95% CI: 1.07–1.57, p = 0.007), PS 2 vs. 0 (HR = 2.99, 95% CI: 1.99–4.50, p &lt; 0.001), corticosteroid use (HR = 1.42, 95% CI: 1.18–1.70, p &lt; 0.001), multifocal disease (HR = 1.63, 95% CI: 1.25–2.13, p &lt; 0.001), biopsy vs. resection (HR = 1.35, 95% CI: 1.04–1.72, p = 0.02), un-methylated promoter of the MGMT (O6-methylguanine-DNA methyltransferase) gene (HR = 1.71, 95% CI: 1.42–2.04, p &lt; 0.001). The model was validated internally and had a concordance index of 0.65.ConclusionA nomogram for overall survival was established. This model can be used for risk stratification and treatment planning, as well as improve enrollment criteria for clinical trials.


2021 ◽  
Vol 12 ◽  
pp. 42
Author(s):  
Iuri Santana Neville ◽  
Alexandra Gomes dos Santos ◽  
Cesar Cimonari Almeida ◽  
Leonardo Bilich Abaurre ◽  
Samia Yasin Wayhs ◽  
...  

Background: The current standard treatment for glioblastoma (GBM) is maximal safe surgical resection followed by radiation and chemotherapy. Unfortunately, the disease will invariably recur even with the best treatment. Although the literature suggests some advantages in reoperating patients harboring GBM, controversy remains. Here, we asked whether reoperation is an efficacious treatment strategy for GBM, and under which circumstances, it confers a better prognosis. Methods: We retrospectively reviewed 286 consecutive cases of newly diagnosed GBM in a single university hospital from 2008 to 2015. We evaluated clinical and epidemiological parameters possibly influencing overall survival (OS) by multivariate Cox regression analysis. OS was calculated using the Kaplan–Meier method in patients submitted to one or two surgical procedures. Finally, the survival curves were fitted with the Weibull model, and survival rates at 6, 12, and 24 months were estimated. Results: The reoperated group survived significantly longer (n = 63, OS = 20.0 ± 2.3 vs. 11.4 ± 1.0 months, P < 0.0001). Second, the multivariate analysis revealed an association between survival and number of surgeries, initial Karnofsky Performance Status, and age (all P < 0.001). Survival estimates according to the Weibull regression model revealed higher survival probabilities for reoperation compared with one operation at 6 months (83.74 ± 3.42 vs. 63.56 ± 3.59, respectively), 12 months (64.00 ± 4.85 vs. 37.53 ± 3.52), and 24 months (32.53 ± 4.78 vs. 12.02 ± 2.36). Conclusion: Our data support the indication of reoperation for GBM, especially for younger patients with good functional status. Under these circumstances, survival can be doubled at 12 and 24 months.


Author(s):  
Alfano Gaetano ◽  
Ferrari Annachiara ◽  
Fontana Francesco ◽  
Mori Giacomo ◽  
Magistroni Riccardo ◽  
...  

AbstractBackgroundAcute kidney injury (AKI) is a recently recognized complication of coronavirus disease-2019 (COVID-19). This study aims to evaluate the incidence, risk factors and case-fatality rate of AKI in patients with documented COVID-19.MethodsWe reviewed the health medical records of 307 consecutive patients hospitalized for symptoms of COVID-19 at the University Hospital of Modena, Italy.ResultsAKI was diagnosed in 69 out of 307 (22.4%) patients. The stages of AKI were stage 1 in 57.9%, stage 2 in 24.6% and stage 3 in 17.3%. Hemodialysis was performed in 7.2% of the subjects. AKI patients had a mean age of 74.7±9.9 years and higher serum levels of the main marker of inflammation and organ involvement (lung, liver, hearth and liver) than non-AKI patients. AKI events were more frequent in subjects with severe lung comprise. Two peaks of AKI events coincided with in-hospital admission and death of the patients. Kidney injury was associate with a higher rate of urinary abnormalities including proteinuria (0.448±0.85 vs 0.18±0.29; P=<0.0001) and hematuria (P=0.032) compared to non-AKI patients. At the end of follow-up, 65.2% of the patients did not recover their renal function after AKI. Risk factors for kidney injury were age, male sex, CKD and non-renal SOFA. Adjusted Cox regression analysis revealed that AKI was independently associated with in-hospital death (hazard ratio [HR]=3.74; CI 95%, 1.34-10.46) compared to non-AKI patients. Groups of patients with AKI stage 2-3 and failure to recover kidney function were associated with the highest risk of in-hospital mortality. Lastly, long-hospitalization was positively associated with a decrease of serum creatinine, likely due to muscle depletion occurred with prolonged bed rest.ConclusionsAKI was a dire consequence of patients with COVID-19. Identification of patients at high-risk for AKI and prevention of kidney injury by avoiding dehydration and nephrotoxic agents is imperative in this vulnerable cohort of patients.


2007 ◽  
Vol 25 (18_suppl) ◽  
pp. 18197-18197
Author(s):  
M. Berhoune ◽  
E. Fabre-Guillevin ◽  
E. Banu ◽  
F. Scotte ◽  
B. Bonan ◽  
...  

18197 Background: Chemotherapy (CT) has shown its effectiveness in symptom control and quality of life improvement in advanced NSCLC patients. The therapeutic strategy and some clinical variables could have a major impact on outcome. Methods: Our retrospective analysis evaluated the impact on overall survival (OS) of the clinical benefit (CB), ECOG performance status (PS) and toxicity, function of treatment. CB was defined as disease-related symptoms improvement according to hospitalization report. Only grade III-IV CTC-NCI version 2 toxicities have been considered. OS was calculated between start of CT and death or last follow-up. Multivariate Cox regression analysis including CB, PS, toxicity and age, stratified by AJCC initial stage was used. Results: Data of 68 consecutive stage IIIB-IV patients treated in a single French centre were analyzed. Chemotherapy was platinum-salt based in 88, 45 and 25% of pts for the first, second and third-line, respectively. Median age was 61 years, 37% were women. More than half (66%) were metastatic and 14% were previously irradiated. Median survival was 14 months (95% CI, 6.1–21.8), 53 % of patients are dead. The risk of death PS-related was multiplied by 2.3, 2.4 and 5.3 for the first, second and third-line of CT, respectively. PS and CB were initially associated with OS (first and second-line CT), but after the third-line of CT only PS was significantly related with OS. The risk of death reduction induced by a CB was 59, 82 and 29%, respectively. Less toxicities during CT were associated with a better OS (an unsignificant 20- 30% risk of death reduction), independently of the chronology of CT. Older pts >70 years have a higher risk of death (HR=1.87), independently of the CB and treatment-related toxicities in the multivariate analysis (P=0.18), sex-adjusted. Conclusions: No matter how many lines of CT are used for a specified patient, the ECOG PS was a patient-related variable with a dominant impact on the outcome. CT must be less toxic in order to achieve a CB and ameliorate the PS. No significant financial relationships to disclose.


2011 ◽  
Vol 29 (4_suppl) ◽  
pp. 427-427
Author(s):  
S. Matsusaka ◽  
N. Mizunuma ◽  
M. Suenaga ◽  
K. Chin ◽  
E. Shinozaki ◽  
...  

427 Background: The purpose of this study was to identify CEC threshold proposal for determining response to FOLFOX4 plus bevacizumab in metastatic colorectal cancer (mCRC). Methods: All patients were enrolled using institutional review board-approved protocols at the Cancer Institute Hospital and provided informed consent. From July 2007 to June 2008, 33 patients treated with FOLFOX4 plus bevacizumab were enrolled in a prospective study. From January 2007 to June 2007, before bevacizumab was approved by the government in Japan, 31 patients treated with FOLFOX4 as a control were enrolled. The study population consisted of patients aged 18 years or older with histologically proven mCRC. Other inclusion criteria were Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1, adequate organ function. CECs of whole blood at the baseline, day 4, 2 weeks after initiation of chemotherapy were isolated and counted using immunomagnetics. Results: There was no correlation between CEC levels and the outcome in the FOLFOX4. In the FOLFOX4 plus bevacizumab, CEC levels at the baseline were significantly associated with the outcome. Patients with 65 or more CECs at the baseline had shorter median PFS (9.2 months), than the median PFS of fewer than 65 CECs at the baseline (18.9 months) in the FOLFOX4 plus bevacizumab (p = 0.003). Patients with 65 or more CECs at the baseline had shorter median OS (23.3 months), than the median OS of fewer than 65 CEC s at the baseline in the FOLFOX4 plus bevacizumab (p = 0.027). In the univariate analysis, lung metastasis, lymph node metastasis, and CEC levels at the baseline predicted PFS. In the univariate Cox regression analyses, peritoneal metastasis, CEC levels at the baseline were associated with OS. In order to evaluate the independent predictive effect of FOLFOX4 plus bevacizumab, multivariate Cox regression analysis was carried out. CEC levels at the baseline were the strongest predictor. Conclusions: A threshold of lower than 65 CEC/4mL at the baseline was a significant predictor of the outcome for colorectal cancer patients treated with FOLFOX4 plus bevacizumab. No significant financial relationships to disclose.


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