Impact of coronavirus of 2019 on the delivery of pharmacy services to patients with cancer: An international survey of oncology pharmacy practitioners.

INTRODUCTION: The coronavirus of 2019 pandemic has necessitated vast and rapid changes in the way oncology pharmacy services are delivered around the world. METHODS/AIMS: An international survey of oncology pharmacists and technicians was conducted via the International Society of Oncology Pharmacy Practitioners and collaborating global pharmacy organisations to determine the impact that the coronavirus of 2019 has had on pharmacy service delivery, pharmacy practitioners and oncology practice. RESULTS: The survey received 862 responses from 40 different countries from September to October 2020. The majority of respondents were pharmacists (n = 841, 97.6%), with 24% involved in the direct care of patients with the coronavirus of 2019. Of the survey participants, 55% increased their time working remotely, with remote activities including dispensing, patient assessment/follow-up and attending multi-disciplinary rounds. Respondents reported a 72% increase in the use of technology to perform remote patient interaction activities and that participation in educational meetings and quality improvement projects was reduced by 68% and 44%, respectively. Workforce impacts included altered working hours (50%), cancelled leave (48%) and forced leave/furloughing (30%). During the pandemic, respondents reported reduced access to intensive care (19%) and anti-cancer (15%) medications. In addition, 39% of respondents reported reduced access to personal protective equipment, including N95 masks for chemotherapy compounding. Almost half of respondents (49%) reported that cancer treatments were delayed or intervals were altered for patients being treated with curative intent. A third of practitioners (30%) believed that patient outcomes would be adversely impacted by changes to pharmacy services. Sixty-five percent of respondents reported impacts on their mental health, with 12% utilising support services. CONCLUSION: The coronavirus of 2019 pandemic has altered the way oncology pharmacy services are delivered. These results demonstrate the adaptability of the oncology pharmacy profession and highlight the importance of formal evaluation of the varied practice models to determine the evidence-based practices that enhance pharmacy services and, thus, should be reinstated as soon as practical and reasonable.

Evaluation of an oral sodium bicarbonate protocol for high-dose methotrexate urine alkalinization.

PURPOSE: Intravenous (IV) sodium bicarbonate is considered standard therapy for high-dose methotrexate (HDMTX) urine alkalinization. Due to a national IV sodium bicarbonate shortage, an oral (PO) sodium bicarbonate protocol was implemented by Alberta Health Services (AHS) for HDMTX urine alkalinization. This study aims to evaluate the efficacy and safety of the PO sodium bicarbonate protocol compared to IV sodium bicarbonate for HDMTX urine alkalinization. METHODS: A retrospective chart review of adult patients who received HDMTX (> 500 mg/m2) with sodium bicarbonate for urine alkalinization at 4 hospitals in Alberta was conducted. Patients who received IV sodium bicarbonate between January and June 2017 and PO sodium bicarbonate between July and December 2017 were compared for the primary outcome of time to methotrexate clearance. RESULTS: A total of 84 and 78 HDMTX cycles were included in the IV and PO cohorts, respectively. No difference in time to methotrexate clearance was seen between the IV and PO cohorts, 91.6 (± 35.4) hours and 95.2 (± 44) hours respectively; p = 0.5. The proportion of HDMTX cycles that experienced a > 25% increase in serum creatinine was not statistically significant, IV protocol 12% and PO protocol 5%; p = 0.13. Nausea and emesis occurred more frequently in the PO cohort than the IV cohort, though rarely resulted in refused doses or change to alternate sodium bicarbonate formulations. CONCLUSIONS: The results of this study indicate that the AHS PO sodium bicarbonate protocol was no different in time to methotrexate clearance or rates of increased serum creatinine when compared to IV sodium bicarbonate.

Clinical outcome of chronic myeloid leukemia patients who switch from first-line therapy with a second generation tyrosine kinase inhibitor to an alternative TKI.

While second generation tyrosine kinase inhibitors (2GTKIs) are highly effective therapies for chronic myeloid leukemia (CML), a significant minority of patients who initiate a 2GTKI will require a switch to an alternative TKI. The long-term outcomes of those who require a change in therapy after front-line 2GTKI therapy are largely undescribed. Here we describe the clinical outcomes associated with switch to an alternative TKI after first-line therapy with a 2GTKI. Of 232 patients who initiated a 2GTKI during the study period, 76 (33 %) switched to an alternative TKI. Reasons for switching included intolerance (79 %) and resistance (21 %). Among the 60 patients who switched due to intolerance, 53 (88 %) were able to achieve or maintain a major molecular response (MMR) with 5-year progression-free survival (PFS) 90.5 % (95 % CI 90.4-90.6 %). Amongst the 16 patients who switched due to resistance, 8 patients (50 %) were able to achieve MMR with 5-year PFS 80.4 % (95 % CI 80.2-80.6 %). Most patients who switched due to intolerance remained on their second-line TKI. Approximately 25 % of patients who initiate first-line 2GTKI in a real world setting will ultimately switch to an alternate TKI due to intolerance. Patients who switch for intolerance continue to enjoy excellent clinical outcomes.

Oral sodium bicarbonate protocol for high-dose methotrexate urine alkalinization: A pediatric experience.

INTRODUCTION: Methotrexate (MTX) is a cytotoxic antimetabolite. Intravenous (IV) hydration and urine alkalinization with sodium bicarbonate (NaHCO3) can mitigate nephrotoxicity associated with high-dose MTX (HDMTX, doses ≥500 mg/m2). A shortage of IV NaHCO3 in 2017 prompted Alberta Children's Hospital (ACH) and Stollery Children's Hospital (SCH) to adopt an alternative protocol including oral NaHCO3 and IV hydration with Lactated Ringer's (LR). METHODS: A retrospective chart review was conducted for ACH and SCH inpatients who received HDMTX between January and December 2017. The primary outcome was the proportion of cycles with delayed HDMTX clearance within the IV and oral cohorts. Secondary outcomes include NaHCO3 administered until clearance, NaHCO3 required to reach pH ≥7, time to reach pH ≥7, incidence of pH <7, time to clearance, and time to discharge. Adverse effects associated with delayed clearance or NaHCO3 administration were also reported. RESULTS: 112 MTX cycles were included, 50 and 62 from the IV and oral cohorts, respectively. Clearance delays beyond protocol expectations occurred in 10 cycles (8.9%), 5 from each cohort (p = 0.72). Differences between cohorts were not statistically significant, except the amounts of NaHCO3 required until clearance (383 vs. 277 mmol/m2, p = 0.005) and to reach pH ≥7 (52 vs. 40 mmol/m2, p = 0.004) were lower in the oral cohort. Incidences of adverse effects were not different. CONCLUSIONS: Oral NaHCO3 with LR is a feasible alternative for urine alkalinization. The total dose of NaHCO3 utilized was lower in the oral cohort, with no additional delays in clearance.

Pediatric pharmacists' perspectives on essential skills and activities for community pharmacists caring for pediatric patients: A mixed-methods study.

BACKGROUND: Provision of care to pediatric patients represents a set of unique challenges for pharmacists. Pharmacists practising in pediatric-specialty areas (acute care or ambulatory) have unique perspectives on approaches to pediatric care that can be shared to support pharmacists less familiar with this group of patients in providing effective, patient-centred care. METHODS: This was a mixed-methods study using data from pharmacist interviews to quantify and qualitatively describe the approaches to care most commonly reported by pediatric-specialty pharmacists when asked to provide advice to pharmacists on providing pharmaceutical care to infants and children. Data were coded in duplicate using an inductive approach, and discrepancies were resolved by consensus. The number of times a theme (or subtheme) was mentioned and the number of pharmacists who mentioned it were used as markers of the relative importance of the content. RESULTS: The themes (and subthemes) that emerged as most important were clinical activities (dose checks, considering indication, using up-to-date height/weight), caregiver counselling (demonstrating measurement, discussing administration), medication safety (using consistent concentrations of liquids), compounded medications (risks of, use of caution), adherence (formulation considerations, palatability), avoiding use of over-the counter products (except analgesics/antipyretics) and use of external supports (colleagues, caregivers, resources). CONCLUSIONS: We present a collated and prioritized list of practical approaches for pharmacists to use when caring for pediatric patients across the spectrum of practice. Can Pharm J (Ott) 2020;153:xx-xx.

Global oncology pharmacy response to COVID-19 pandemic: Medication access and safety.

Response, action, and adaptation of the way health services are delivered will impact our ability to provide optimized and continuity of care while acting within resource constraints imposed by COVID-19. Care for patients with cancer is particularly important given increased infection rates and worse outcomes from COVID-19 in this patient population, as well as potential adverse outcomes if treatment pathways need to be compromised. In this commentary, we provide a global oncology pharmacy perspective (including both developed and developing nations) on how COVID-19 has impacted access to and delivery of cancer therapies. This perspective was prepared by the International Society of Oncology Pharmacy Practitioners, with input from national and regional oncology pharmacy practice groups (42 practice leaders from 28 countries and regions) who contributed to a snapshot survey between 10 and 22 April 2020. Specifically, we highlight challenges related to safe handling of hazardous drugs and maintaining high-quality medication safety standards that have impacted various stakeholders.

High incidence of Pneumocystis jirovecii pneumonia in allogeneic hematopoietic cell transplant recipients in the modern era.

BACKGROUND: International guidelines for Pneumocystis jirovecii pneumonia (PJP) prevention recommend prophylaxis for ≥6 months following allogeneic hematopoietic cell transplantation, and longer in patients with graft-versus-host disease (GVHD) or on immunosuppressive therapy (IST). These recommendations are based on cohorts of patients who did not routinely receive anti-thymocyte globulin (ATG) for GVHD prophylaxis. METHODS: We performed a retrospective chart review of 649 patients, all of whom received ATG as part of GVHD prophylaxis. RESULTS: The cumulative incidence of definite PJP was 3.52% at both 3 and 5 years (median follow up, 1648 days for survivors). PJP occurred in 13 non-GVHD patients between days 207 and 508, due in part to low CD4 T-cell counts (<200 CD4 T cells/µL). PJP occurred in eight GVHD patients between days 389 and 792, due in part to non-adherence to PJP prophylaxis guidelines (discontinuation of PJP prophylaxis at <3 months after discontinuation of IST). Breakthrough PJP infection was not observed in patients receiving prophylaxis with cotrimoxazole, dapsone or atovaquone, whereas three cases were observed with inhaled pentamidine. DISCUSSION: In conclusion, for non-GVHD patients receiving ATG-containing GVHD prophylaxis, 6 months of PJP prophylaxis is inadequate, particularly if the CD4 T-cell count is <200 cells/µL or if there is a high incidence of PJP in the community. For patients with GVHD receiving ATG-containing GVHD prophylaxis, continuing PJP prophylaxis until ≥3 months post-discontinuation of IST is important. Cotrimoxazole, dapsone and atovaquone are preferred over inhaled pentamidine.

Clinical Pharmacokinetic and Pharmacodynamic Considerations in Treating Non-Hodgkin Lymphoma.

Non-Hodgkin lymphoma (NHL) includes a variety of closely related malignancies that originate from lymphoid precursors. The majority of NHLs are of B-cell lineage, for which traditional therapy involves chemotherapy in combination with the anti-CD20 monoclonal antibody rituximab. Ongoing research into the pathogenesis of NHL subtypes has given rise to the use of novel agents that target specific molecular pathways. While the incidence of NHL extends over a range of ages from pediatric to elderly settings, the majority of diagnoses occur over age 60 years. Increasing the use of concomitant medication coupled with declining organ function among this group of patients creates pharmacokinetic (PK) challenges in administering a number of agents involved in the treatment of NHL. In addition, since many of the new agents are administered orally, there are a number of added PK factors that must be taken into consideration with their prescribing and administration. This article will review the available literature on the PK and pharmacodynamic properties of agents commonly used in the treatment of NHL, and intends to provide information that can assist with properly using these drugs in this setting.

Integration of a nausea and vomiting assessment tool into antineoplastic management of pediatric oncology patients.

BACKGROUND: Antineoplastic-induced nausea and vomiting (AINV) is a treatment-related issue that can have significant negative influences on the cancer patient's quality of life. Assessment of nausea is challenging in children as few studies include the perception of nausea as an outcome, and the severity is rarely evaluated with the use of a validated instrument. We describe our experience of integrating an AINV tool into patient care at the Alberta Children's Hospital.Procedure: The Pediatric Nausea Assessment Tool (PeNAT) was adapted to create a standardized tool that could be used by the clinical pharmacists for AINV assessment. From February to August 2017, 74 patients receiving 217 cycles of highly or moderately emetogenic chemotherapy (HEC or MEC) were eligible to use the AINV tool. Patients that completed the AINV tool were contacted to complete a satisfaction survey. RESULTS: AINV tool uptake was low: 47 (22%) eligible chemotherapy cycles utilized the tool (24 (32%) and 23 (16%) cycles of HEC and MEC, respectively, (p < 0.01)). Ifosfamide-containing cycles received the highest nausea ratings, with nausea severity correlated with agent emetogenicity. Mean nausea rating was 2.07 versus 1.76 for patients receiving HEC or MEC, respectively. Clinical pharmacists performed 1.24 AINV interventions per day. Patient satisfaction with AINV care overall was high; however, 51% of patients indicated that the tool led to no changes in nausea symptoms. CONCLUSIONS: AINV tool uptake was low with limited value in improving outcomes. Incorporation of nausea assessment into the electronic health record and potential use of a mobile application may improve uptake.

Integration of clinical pharmacists into an ambulatory, pediatric hematology/oncology/transplant clinic.

OBJECTIVES: To describe key activities performed by a newly deployed clinical pharmacist in an outpatient pediatric hematology, oncology, transplant clinic. To demonstrate how utilization of the pharmacist evolved, as indicated by changes in frequency of key activities, during the first four months of integration. DESIGN: Clinical pharmacists were made consistently available in an outpatient clinic serving hematology, oncology, transplant patients and their families. A list of key activities, based on provincial clinical pharmacist standards, was created to provide a framework for the role. Over a four-month period, the pharmacists recorded the number of times activities were performed. RESULTS: Over the data collection period, obtaining best possible medication histories (203), providing medication counseling (150), and creating adherence aids (144) were the most commonly performed activities. In comparison to the first month, key activities increased by 73% in the fourth month. Notably, providing recommendations for drug therapy (156%), assessments of adherence (122%), and best possible medication history collection (88%) increased considerably. CONCLUSIONS: The integration of a pharmacist into an outpatient pediatric hematology, oncology, transplant clinic resulted in the provision of several key clinical pharmacy services. As the role developed, activities were performed more frequently, demonstrating growth in utilization of the pharmacist.

Implementation of additional prescribing authorization among oncology pharmacists in Alberta.

PURPOSE: To describe the practice settings and prescribing practices of oncology pharmacists with additional prescribing authorization. METHODS: A descriptive, cross-sectional survey of all oncology pharmacists in Alberta was conducted using a web-based questionnaire over four weeks between March and April 2016. Pharmacists were identified from the Cancer Services Pharmacy Directory and leadership staff in Alberta Health Services. Descriptive statistics were used to describe the practice setting, prescribing practices, motivators to apply for additional prescribing authorization, and the facilitators and barriers of prescribing. Logistic regression was used to explore factors associated with having additional prescribing authorization. RESULTS: The overall response rate was 41% (71 of 175 pharmacists). Oncology pharmacists with additional prescribing authorization made up 38% of respondents. They primarily worked in urban, tertiary cancer centers, and practiced in ambulatory care. The top 3 clinical activities they participated in were medication reconciliation, medication counseling/education, and ambulatory patient assessment. Respondents thought additional prescribing authorization was most useful for ambulatory patient assessment and follow-up. Antiemetics were prescribed the most often. The median number of prescriptions written in an average week of clinical work was 5. Competence, self-confidence, and the potential impact on patient care/perceived impact on work environment were the strongest facilitators of prescribing. The strongest motivators to apply for additional prescribing authorization were relevancy to practice, the potential for increased efficiency, and advancing the profession. CONCLUSION: The current majority of oncology pharmacist prescribing in Alberta occurs in ambulatory care with a large focus on antiemetic prescribing. Pharmacists found additional prescribing authorization most useful for ambulatory patient assessment and follow-up.

Adherence to pediatric acute chemotherapy-induced nausea and vomiting guidelines in Canadian hospitals.

BACKGROUND: Chemotherapy-induced nausea and vomiting (CINV) impacts quality of life for patients. Guidelines for emetogenicity classification and prevention of CINV in children were recently published and endorsed by pediatric oncology organizations. PROCEDURE: A multicenter chart review was performed at four Canadian pediatric oncology centers examining rates of prescribing adherence to CINV guidelines between January 2012 and December 2015. Eligible patients received their first chemotherapy course of highly emetogenic chemotherapy (HEC) or moderately emetogenic chemotherapy (MEC). RESULTS: Guideline adherence was described in 204 patients as antiemetic-only guideline adherence (AGA; examined medication/class prescribed only) and complete guideline adherence (CGA; examined medication/class, dose, frequency, and duration prescribed). Adherence was 29% (HEC 30%, MEC 19%, P = 0.1) and 2% for AGA and CGA patients, respectively. Vomiting in the first 24 h was experienced by 24% of AGA and 34% of non-AGA patients (P = 0.13), with mean breakthrough medication doses similar between AGA and non-AGA groups (HEC 1.8 vs 1.5, P = 0.45; MEC 3 vs 1.42, P = 0.35). In the first 24 h, HEC AGA patients achieved a complete control rate of 37% vs 45% for non-AGA patients (P = 0.31), while patients receiving AGA therapy for MEC achieved a complete control rate of 80% vs 24% for non-AGA patients (P = 0.02). CONCLUSIONS: Adherence to guidelines was low across all four pediatric institutions. Each center used different approaches to implement pediatric CINV guidelines. Complete CINV control was low, with reports of emesis high, indicating that patients are not receiving optimal treatment.

Safety and efficacy of nabilone for acute chemotherapy-induced vomiting prophylaxis in pediatric patients: A multicenter, retrospective review.

OBJECTIVES: To describe the safety and efficacy of nabilone given to pediatric patients to prevent acute chemotherapy-induced nausea and vomiting (CINV). METHODS: A multicenter, retrospective review of pediatric patients who received nabilone for acute CINV prophylaxis between December 1, 2010 and August 1, 2015 was undertaken. One course of nabilone was evaluated per patient. Adverse effects associated with nabilone use were noted. The proportion of patients who experienced complete acute chemotherapy-induced vomiting (CIV) control during the acute phase was determined. The acute phase was defined as starting with the first chemotherapy dose and continuing until 24 h after administration of the last chemotherapy dose of the chemotherapy block. RESULTS: One hundred ten eligible patients (median age: 14.0 years, range: 1.1-18.0 years; 65 male) were identified. Most (109/110) received nabilone plus a 5-HT3 antagonist for CINV prophylaxis. Adverse effects associated with nabilone were experienced by 34% (37/110) of children. All were of CTCAE Version 4.03 Grade 2 or less. Sedation (20.0%), dizziness (10.0%), and euphoria (3.6%) were the most commonly reported adverse events. Nabilone was discontinued in 10 patients due to an adverse event. The proportions of patients receiving highly or moderately emetogenic chemotherapy who experienced complete acute CIV control were 50.6% (42/83) and 53.8% (14/26), respectively. CONCLUSION: Adverse events associated with nabilone were common but of minor clinical significance. Acute CIV control in children receiving nabilone as a part of their antiemetic regimen was poor. Future work should focus on implementation of guideline-consistent CINV prophylaxis and treatment.

Evaluation of mobile phone applications to support medication adherence and symptom management in oncology patients.

Mobile phone applications (apps), may support pediatric oncology patients with medication and disease management. A scoping review of the literature, a search of the iTunes App and Google Play Stores, was conducted to identify medication and symptom management apps for adult and pediatric oncology patients. Pooled results yielded 28 apps which were assessed for quality using the Mobile Application Rating Scale, with mean overall scores ranging from 2.8 to 4.3. Most apps received low scores in the Engagement domain. Our study assessed the quality of available mobile oncology apps and identified areas for improvement in design and function.

Epstein-barr virus DNAemia monitoring for the management of post-transplant lymphoproliferative disorder.

BACKGROUND: Post-transplant lymphoproliferative disorder (PTLD) is a potentially fatal complication of allogeneic hematopoietic cell transplantation (HCT). Epstein-Barr virus (EBV) reactivation (detectable DNAemia) predisposes to the development of PTLD. METHODS: We retrospectively studied 306 patients monitored for EBV DNAemia after Thymoglobulin-conditioned HCT to determine the utility of the monitoring in the management of PTLD. DNAemia was monitored weekly for ≥12 weeks post-transplantation. RESULTS: Reactivation was detected in 82% of patients. PTLD occurred in 14% of the total patients (17% of patients with reactivation). PTLD was treated with rituximab only when and if the diagnosis was established. This allowed us to evaluate potential DNAemia thresholds for pre-emptive therapy. We suggest 100,000-500,000 IU per mL whole blood as this would result in unnecessary rituximab administration to only 4-20% of patients and near zero mortality due to PTLD. After starting rituximab (for diagnosed PTLD), sustained regression of PTLD occurred in 25/25 (100%) patients in whom DNAemia became undetectable. PTLD progressed or relapsed in 12/17 (71%) patients in whom DNAemia was persistently detectable. DISCUSSION: In conclusion, for pre-emptive therapy of PTLD, we suggest threshold DNAemia of 100,000-500,000 IU/mL. Persistently detectable DNAemia after PTLD treatment with rituximab appears to have 71% positive predictive value and 100% negative predictive value for PTLD progression/relapse.

Risk factors for post-transplant lymphoproliferative disorder after Thymoglobulin-conditioned hematopoietic cell transplantation.

Epstein-Barr virus (EBV)-induced post-transplant lymphoproliferative disorder (PTLD) occurs frequently when rabbit antithymocyte globulin (ATG) is used in hematopoietic cell transplant (HCT) conditioning. We retrospectively studied 554 patients undergoing ATG-conditioned myeloablative HCT. Strategies used to minimize mortality due to PTLD were either therapy of biopsy-diagnosed PTLD in the absence of EBV DNAemia monitoring (n = 266) or prompt therapy of presumed PTLD (based on clinical/radiologic signs and high EBV DNAemia, in the setting of weekly EBV DNAemia monitoring) (n = 199). Both strategies resulted in similar mortality due to PTLD (0.7% vs 1% at 2 years, P = .43) and similar overall survival (63% vs 67% at 2 years, P = .23) even though there was a trend toward higher PTLD incidence with the prompt therapy. Donor positive with recipient negative EBV (D+R-) serostatus was a risk factor for developing PTLD. Older patient age, HLA-mismatched donor, and graft-versus-host disease were not associated with increased risk of PTLD. In summary, in ATG-conditioned HCT, D+R- serostatus, but not older age, mismatched donor or GVHD is a risk factor for developing PTLD. EBV DNAemia monitoring may be a weak risk factor for developing/diagnosing PTLD; the monitoring coupled with prompt therapy does not improve survival.

Clinical impact and management of fluconazole discontinuation on sirolimus levels in bone marrow transplant patients.

Sirolimus, an immunosuppressant, is indicated post-allogeneic stem cell transplant to reduce the risk of graft-versus-host-disease. Sirolimus is metabolized by cytochrome P450 3A4 and is a substrate of the P-glycoprotein (P-gp) drug efflux pump. Interactions with known inhibitors of the CYP3A4 enzyme and P-glycoprotein, such as fluconazole, are anticipated. Co-administration of fluconazole leads to an increase in sirolimus blood concentrations due to an inhibition of metabolism. The discontinuation of fluconazole will likely result in a decline in sirolimus blood concentrations, leaving patients at risk of graft-versus-host-disease. We report on three patients managed by the Hematology, Oncology Blood and Marrow Transplant Program at the Alberta Children's Hospital. The discontinuation of fluconazole showed a marked reduction in sirolimus trough levels, requiring >200% increase in sirolimus dose to achieve therapeutic levels.

Oncology Drug Dosing in Gilbert Syndrome Associated with UGT1A1: A Summary of the Literature.

Gilbert syndrome (GS) is a hereditary condition that affects ~10% of the population. It is characterized by intermittent, unconjugated hyperbilirubinemia in the absence of hepatocellular damage and hemolysis. Although GS is often described as a benign laboratory finding, it may alter drug metabolism by decreasing the ability to conjugate drugs. Genetic polymorphisms, specifically the UGT1A1*28 allele, may reduce glucuronidation by 30% that severely impacts the ability to metabolize certain medications. Antineoplastic agents used in oncologic settings have toxic side effects, and alterations in metabolism may result in severe or even life-threatening toxicities. Many of the drug monographs provided by manufacturers contain dose adjustment parameters for hepatic function, using serum bilirubin as a surrogate marker. However, in patients with GS, hepatic function remains normal in the setting of hyperbilirubinemia, and scant literature is available to provide guidance on empirical dosage adjustment. In this review, we conducted a literature search of routinely used oncology medications and assessed the need for empirical dose adjustments in the setting of GS.