UNASSIGNED: Rapid reduction of leukemic cells in the bone marrow during remission induction chemotherapy (RIC) can lead to significant complications such as tumor lysis syndrome (TLS). We investigated whether prephase steroid treatment before RIC could decrease TLS incidence and improve overall survival in pediatric patients with acute lymphoblastic leukemia (ALL).
UNASSIGNED: Data were extracted from the Common Data Model databases in two tertiary-care hospitals in Seoul, South Korea. Patients were classified into the treated or untreated group if they had received RIC with prephase steroid treatment ≥7 days before RIC in 2012-2021 or not, respectively. Stabilized Inverse Probability of Treatment Weighting (sIPTW) was applied to ensure compatibility between the treated and untreated groups. The incidence of TLS within 14 days of starting RIC, overall survival (OS), and the incidence of adverse events of special interest were the primary endpoints. Multiple sensitivity analyses were performed.
UNASSIGNED: Baseline characteristics were effectively balanced between the treated (n=308.4) and untreated (n=246.6) groups after sIPTW. Prephase steroid treatment was associated with a significant 88% reduction in the risk of TLS (OR 0.12, 95% CI: 0.03-0.41). OS was numerically greater in the treated group than in the untreated group although the difference was not statistically significant (HR 0.64, 95% CI 0.25-1.64). The treated group experienced significantly elevated risks for hyperbilirubinemia and hyperglycemia. The reduction in TLS risk by prephase steroid treatment was maintained in all of the sensitivity analyses.
UNASSIGNED: Prephase steroid treatment for ≥7 days before RIC in pediatric patients with ALL reduces the risk of TLS, while careful monitoring for toxicities is necessary. If adequately analyzed, real-world data can provide crucial effectiveness and safety information for proper management of pediatric patients with ALL, for whom prospective randomized studies may be difficult to perform for ethical and practical reasons.

UNASSIGNED: Tumor lysis syndrome (TLS) often occurs early after induction chemotherapy for acute lymphoblastic leukemia (ALL) and can rapidly progress. This study aimed to construct a machine learning model to predict the risk of TLS using clinical indicators at the time of ALL diagnosis.
UNASSIGNED: This observational cohort study was conducted at the National Clinical Research Center for Child Health and Disease. Data were collected from pediatric ALL patients diagnosed between December 2008 and December 2021. Four machine learning models were constructed using the Least Absolute Shrinkage and Selection Operator (LASSO) to select key clinical indicators for model construction.
UNASSIGNED: The study included 2,243 pediatric ALL patients, and the occurrence of TLS was 8.87%. A total of 33 indicators with missing values ≤30% were collected, and 12 risk factors were selected through LASSO regression analysis. The CatBoost model with the best performance after feature screening was selected to predict the TLS of ALL patients. The CatBoost model had an AUC of 0.832 and an accuracy of 0.758. The risk factors most associated with TLS were the absence of potassium, phosphorus, aspartate transaminase (AST), white blood cell count (WBC), and urea levels.
UNASSIGNED: We developed the first TLS prediction model for pediatric ALL to assist clinicians in risk stratification at diagnosis and in developing personalized treatment protocols. This study is registered on the China Clinical Trials Registry platform (ChiCTR2200060616).
UNASSIGNED: https://www.chictr.org.cn/, identifier ChiCTR2200060616.

Venetoclax is active in both frontline and relapsed/refractory settings for the treatment of chronic lymphocytic leukemia (CLL). Although the prevalence and severity of tumor lysis syndrome (TLS) are well characterized in clinical trials, laboratory and clinical TLS remain relatively unexplored in real-world clinical practice.In this prospective, real-world observational study, we aimed to determine the incidence and outcomes of TLS in patients with CLL receiving venetoclax outside a clinical trial. The study (VeRVe) was conducted in centers in Austria, Germany, and Switzerland.Two hundred and thirty-nine patients were treated according to local label with at least one dose of venetoclax. Patient demographics, baseline characteristics, and blood chemistry at baseline were documented, and descriptive statistical analyses were conducted.Seventy eight patients (33%) were treated with venetoclax monotherapy, 101 (42%) with venetoclax in combination with rituximab and 60 (25%) with venetoclax in combination with obinutuzumab. In all cases, the TLS risk mitigation strategy adhered to the ramp-up protocol. Median age was 73 years and 66% of patients were male. The majority of patients (75%) had relapsed/refractory CLL, 63/192 (32.8%) patients tested had a del(17p) and 93/134 (69.4%) patients tested had unmutated immunoglobulin heavy chain variable region gene (IGHV). Clinical TLS occurred in 5 patients (2.1%) and laboratory TLS occurred in 15 patients (6.3%). Ten patients received specific treatment, of which 6 were hospitalized. There were no deaths due to a TLS event and venetoclax was well-tolerated. Of the 5 clinical TLS events reported, none were fatal or resulted in renal failure (NCT03342144, registered on Nov 10, 2017).

Although some tumor lysis syndrome (TLS) cases have been reported with patients with multiple myeloma (MM) taking monoclonal antibodies (mAbs), the association between TLS and mAbs remains mostly unknown. We aim to investigate the association between TLS and mAbs and describe clinical features. We conducted a disproportionality analysis to investigate the link between mAbs and TLS by excluding known confounders and compared with other anticancer drugs. The association between mAbs and TLS was evaluated using information component (IC). Drug-drug interaction signals were calculated based on the Ω shrinkage measure. Parametric distribution with the goodness-of-fit test was used for the reported time-to-onset analysis. From 2016 Q1, to 2022 Q4, a total of 274 TLS with mAbs were reported in the US Food and Drug Administration Adverse Event Reporting System (FAERS) database. There were 27% of patients with TLS with mAbs who died and 20.1% occurred a life-threatening situation. Daratumumab, elotuzumab, and belantamab mafodotin presented a robust disproportionate signal of TLS after excluding known confounders (IC025  > 0). Daratumumab had the highest disproportionate signal of TLS among all anticancer drugs for MM. Reported time-to-onset analysis showed the median days for TLS with daratumumab, isatuximab, elotuzumab, and belantamab mafodotin were 1.5, 14.5, 5.5, and 5.5 days, respectively. The drug-drug interaction analysis showed the co-administration of drugs known to increase urate, induce hyperkalemia, or hypocalcemia elevated the reporting frequency for TLS with mAbs (Ω025  > 0). Our postmarketing pharmacovigilance analysis detected the reporting association of TLS and mAbs in patients with MM. Additional studies with robust epidemiological study designs that can validate these findings are warranted.

BACKGROUND: The tumor lysis syndrome is a medical emergency. Its presentation can be spontaneous or secondary, as a consequence of the established treatment. The diagnosis and treatment of the tumor lysis syndrome (TLS) has become a crucial goal to the evolution and improvement of treatments and targeted therapies.
METHODS: Between January 2014 and December 2019, we retrospectively reviewed inpatients aged over 18 years with hematological neoplasms from a tertiary hospital in Brazil. We identified 112 episodes of TLS in 97 patients. The incidence was 10.5% and the median OS was 13.0 months (95%CI 6.2 - 19.7). The median age was 56 years (IQR 39.5 - 64). The most frequent diagnoses were multiple myeloma (18.6%), acute myeloid leukemia (17.5%) and diffuse large B-cell lymphoma (17.5%). All patients received intravenous (IV) hydration. The management also included the administration of allopurinol in 76% of the cases and rasburicase in eight patients. Renal replacement therapy was necessary in 37% of the cases. In the multivariate analysis, age, HIV status and ICU treatment were significantly associated with OS.
CONCLUSIONS: The TLS is a serious complication in the setting of hematological malignancies. The use of scores for risk stratification, as well as the inclusion of prophylactic measures and prompt treatment with frequent laboratory monitoring, is essential to reduce morbidity and mortality in the comprehensive treatment of these patients.

BACKGROUND: In a Phase 3 international clinical trial (VIALE-C), venetoclax plus low-dose cytarabine improved the response rate and overall survival versus placebo plus low-dose cytarabine in patients with newly diagnosed acute myeloid leukemia who were ineligible for intensive chemotherapy. After the enrollment period of VIALE-C ended, we conducted an expanded access study to provide preapproval access to venetoclax in combination with low-dose cytarabine in Japan.
METHODS: Previously, untreated patients with acute myeloid leukemia who were ineligible for intensive chemotherapy were enrolled according to the VIALE-C criteria. Patients received venetoclax (600 mg, Days 1-28, 4-day ramp-up in Cycle 1) in 28-day cycles and low-dose cytarabine (20 mg/m2, Days 1-10). All patients took tumor lysis syndrome prophylactic agents and hydration. Safety endpoints were assessed.
RESULTS: Fourteen patients were enrolled in this study. The median age was 77.5 years (range = 61-84), with 78.6% over 75 years old. The most common grade ≥ 3 treatment-emergent adverse event was neutropenia (57.1%). Febrile neutropenia was the most frequent serious adverse event (21.4%). One patient developed treatment-related acute kidney injury, leading to discontinuation of treatment. Two patients died because of cardiac failure and disease progression that were judged not related to study treatment. No patients developed tumor lysis syndrome.
CONCLUSIONS: The safety outcomes were similar to those in VIALE-C without new safety signals and were well managed with standard medical care. In clinical practice, more patients with severe background disease are expected, in comparison with in VIALE-C, suggesting that it is important to carefully manage and prevent adverse events.

This retrospective, observational study evaluated patterns of inpatient versus outpatient tumour lysis syndrome (TLS) monitoring during venetoclax ramp-up in 170 patients with chronic lymphocytic leukaemia. The primary outcome was clinical/biochemical TLS. Two clinical and four biochemical TLS occurred (4.1%). Five of the six events occurred in high-risk patients, four occurred at 20 mg dose and three at the 6-h time-point. Inpatient versus outpatient TLS rates within the high-risk subgroup were 15% and 8%. Risk category was the only predictor of TLS events in multivariate analysis. Outpatient escalation did not associate with clinically meaningful TLS events, suggesting outpatient escalation has manageable associated TLS risks, including in high-risk cohorts. These observations require confirmation in larger studies.

The FDA recommended dose of rasburicase 0.2 mg/kg/day till the resolution of TLS or up to 5 days, might be in excess and is prohibitively expensive. The quality of evidence supporting low dose rasburicase is limited. The objective is to study the plasma uric acid response rate. This is a single center, non-randomised phase II study. Duration is 10 June 2017 till 30 July 2019. Study setting is at Adult Hematolymphoid Unit, Tata Memorial Center. Participants are patients with acute leukemia and high-grade lymphomas aged >/=18 years, with ECOG PS of 0-3, with either laboratory or clinical TLS. Rasburicase was administered at fixed-dose of 1.5 mg. The subsequent doses (1.5 mg each dose) were administered only if plasma UA levels did not decline by >50% on day 2, at the physician\'s discretion. We demonstrate that a low-dose rasburicase strategy leads to rapid and sustained reductions of uric acid in about 52% patients.

Introduction Tumor lysis syndrome (TLS) is a life-threatening metabolic abnormality. The incidence of TLS depends on the underlying malignancy. In a recent analysis of hematological malignancy, the incidence of clinical TLS in children was 3.8%, laboratory TLS 46.2%, and hyperphosphatemia 32.7%. Sevelamer is effective for the treatment of hyperphosphatemia associated with renal failure; however, there is no clear data that it has the same effect in treating hyperphosphatemia with TLS. Methods This was a retrospective study among children aged ≤14 years with hematological malignancy who developed TLS and received sevelamer to treat hyperphosphatemia at Princess Norah Oncology Center, King Abdulaziz Medical City (KAMC) in Jeddah from January 2012 to December 2016. Results A total of 34 patients received sevelamer. The majority was male (64%), with a median age of six years. The median sevelamer dose per day was 1600 mg, while the median duration of use was two days. Phosphate level was significantly decreased at different times (24 hours, 48 hours, and 72 hours) during sevelamer usage, p-value <0.001. Conclusion In our study, the use of sevelamer resulted in a significant decrease in phosphate levels. This finding further consolidates the efficacy of sevelamer in treating hyperphosphatemia with TLS. However, further research into the drug\'s kinetics is recommended.

BACKGROUND: This is the first US-representative, retrospective, real-world propensity score (PS) matching study comparing the occurrence of TLS-associated fatalities following allopurinol monotherapy versus rasburicase monotherapy. We have previously found rasburicase significantly and more rapidly reduces uric acid exposure (AUC) compared to allopurinol in patients with or at risk of TLS (Goldman/Cairo et al., Blood, 2001).
OBJECTIVE: To determine if a significant difference exists in the proportion of TLS-associated fatalities following treatment with allopurinol or rasburicase monotherapy for having or being at risk of TLS.
METHODS: 282 rasburicase and allopurinol patients were PS-matched for TLS risk using eleven predictive covariates. Patients were matched 1:1 using calipers of width equal to 0.2 of the standard deviation of the logit of the PS (d score). The overall PS logit was almost 0.6 before matching but near 0.0 afterward; covariates exhibited only a small imbalance (|d|<0 .25), indicating patients were well matched.
METHODS: Anonymized patient information from our 2021 physician-based, blinded, retrospective study, provided by 266 oncologists from US physician-owned practices, academic and non-academic hospitals, and outpatient clinics.
METHODS: Fielded June-September, the 2021 study included 715 randomized liquid-tumor patients treated in the past year for hyperuricemia (HU) risk and TLS potential. The 2022 PSM analysis included only those receiving rasburicase or allopurinol monotherapy and excluded patients with spontaneous TLS or TLS before HU treatment, leaving 533 potential subjects. 282 were matched on PS and eleven pre-HU treatment covariates: acute renal failure, age, anti-cancer regimen, creatinine, gender, lactate dehydrogenase, perceived risk, renal disease, tumor type, uric acid, and white blood count. Unmatched cases were discarded.
METHODS: Proportions of mortalities that physicians said were the direct result of TLS. The null hypothesis before matching was no significant difference between the groups.
RESULTS: Analyzing all matched patients (n=141 in each group), regardless of TLS development following HU treatment, TLS-associated mortality was significantly less likely among rasburicase patients (2.1% vs. 7.1% [P-value 0.047]). Analyzing the subset who developed TLS after HU treatment, TLS-associated fatalities were even less likely among rasburicase patients, 3 of 36 rasburicase vs. 10 of 27 allopurinol patients [P-value 0.005].
CONCLUSIONS: Results indicate rasburicase compared to allopurinol significantly reduces TLS-associated fatalities.