The financial impact of reducing drug waste with biosimilar transition of trastuzumab in the Oncology Care Model for the U.S. Oncology Network

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Background: The Oncology Care Model (OCM), a 6-year long Medicare value-based care program, rewards practices for decreasing total cost of care (TCOC) compared to a benchmark price, while maintaining high quality cancer care. Care services for enrolled patients are divided into 6-month episodes within 1-year time intervals called Performance Periods (PP). One approach to reducing TCOC is reducing the expenditure for drug waste. In mid-2017, trastuzumab (HER2-targeted monoclonal antibody) 420 mg multi-dose vial (MDV) was discontinued and replaced with a 150 mg single-dose vial (SDV), leading to wastage of the remaining partial quantities of the SDV after preparation of a patient-defined dose. The increased drug waste led to an increase in the total drug cost of trastuzumab and TCOC. Late 2019, MDV and SDV biosimilar trastuzumab products were introduced, and The US Oncology Network (The Network) practices adopted the MDV biosimilar as a strategy to reduce drug waste and TCOC. This study highlights the impact of trastuzumab drug waste on TCOC. Methods: Claims data for 14 Network practices, participating in OCM, were assessed. The financial impact of drug waste and TCOC for The Network’s transition from MDV trastuzumab to SDV trastuzumab in 2017, and from SDV trastuzumab to the MDV biosimilar trastuzumab in 2020 was evaluated. Results: With the use of MDV trastuzumab during OCM PP1, drug waste accounted for 0.05% of the total dose of trastuzumab. After having to shift from MDV to SDV during PP2, as a result of the packaging change, trastuzumab drug waste increased to 10.25% of the total dose, with an increase in TCOC by 0.25% ($2M) per PP during PPs 3-7. As The Network practices adopted the use of MDV biosimilar trastuzumab starting in PP8, drug waste declined 57% to 4.4% of the total dose in PP9, reducing the drug waste component of TCOC by $1.4M (0.16%). Had all SDV trastuzumab doses been transitioned to the MDV biosimilar, an additional $600K (0.09%) in TCOC could have been reduced in PP9. Conclusions: TCOC fluctuations can be driven by not just increasing costs or increased utilization, but also by drug packaging and increasing drug waste. The discontinuation of MDV trastuzumab resulted in a substantial financial impact on drug waste, TCOC, and cost for patients. Swift transition to biosimilar MDV trastuzumab within The Network helped to significantly reduce drug waste and its impact on TCOC in the OCM. Trastuzumab biosimilars, in addition to being cost-effective alternatives to biological therapeutics, offer significant cost savings via drug waste reduction.

Abstract P3-08-10: Feasibility and promise of a self-directed walking program to reduce joint pain among older breast cancer patients on adjuvant aromatase inhibitors

Background: Most breast cancer cases diagnosed among postmenopausal women are hormone receptor positive (HR+); standard adjuvant endocrine treatment usually includes an aromatase inhibitor (AI). Joint pain/stiffness/achiness (arthralgia) is a common AI side-effect, and AI discontinuation due to this side-effect is an estimated 20-32%. There is a need for effective alternative or adjunctive approaches to arthralgia management that enable survivors to remain on AI therapy while optimizing as pain-free a life as possible. This pilot study investigates the feasibility of a highly scalable 6-week self-directed physical activity (PA) program – Walk With Ease (WWE) – among elderly female breast cancer survivors on AIs who report joint pain. WWE goal: minimum of 30 minutes of walking 5 days a week (150 minutes/week).

Methods: Recruitment: BC survivors age 65+ were recruited through the oncology clinic of a university-affiliated hospital. Eligibility: age 65+; Stage I-III breast cancer; currently on AI therapy; self-reported joint pain/stiffness; physician permission to engage in PA; English speaking. Measures: (1) walking – number of days per week and number of minutes per walk, (2) visual analog scales (VAS) for joint pain, fatigue and stiffness, and (3) arthritis self-efficacy (ASE) to manage joint pain and fatigue. Statistics: t-test evaluation of changes in mean values.

Results: Sample (N = 20) – mean age 71 (65-87), 85% Caucasian, 35% < high school, mean BMI 29. 63% chemotherapy, 61% radiation therapy. 90% completed the 6-week intervention. Compared to baseline, total minutes of walking per week increased from 95 (0-450) to 172 (45-700) (p<.001) and mean joint pain decreased 10% (p = 0.63), fatigue decreased 19% (p = 0.31), and joint stiffness decreased 32% (p = 0.07). Post-intervention, 71% of participants were “fairly” or “extremely” confident they would continue walking; 100% would recommend WWE to other breast cancer survivors experiencing joint pain or stiffness; 100% thought they had learned how joint pain or stiffness could be lessened by physical activity, and how to safely engage in moderate-intensity physical activity; 90% thought WWE had motivated them to become more physically active, and how to overcome physical and mental barriers to walking; and 90% were fairly to extremely confident they would continue walking.

Conclusions: A moderate-intensity self-directed walking program is feasible for older breast cancer patients on AI therapy and almost doubled the total time of walking per week over a 6 week period. Joint pain, stiffness, and fatigue decreased, and the walking program was perceived as informative and motivational. These data are promising and the WWE intervention warrants testing in a larger randomized trial of breast cancer survivors on AI therapy.

Citation Information: Cancer Res 2013;73(24 Suppl): Abstract nr P3-08-10.

Chronic radiographic lung changes in children with vertically transmitted HIV-1 infection

OBJECTIVE

We prospectively studied children with and without maternally transmitted HIV-1 infection born to mothers infected with HIV-1 to determine the incidence of chronic radiographic lung changes (CRC) and to correlate these changes with clinical assessments.

SUBJECTS AND METHODS

Between 1990 and 1997, we scored 3050 chest radiographs using a standardized form. Group I children (n = 201) were HIV-1-infected at enrollment. Group II children (n = 512) were enrolled prenatally or before 28 days postpartum and subsequently subdivided into group IIa (n = 86), children identified as HIV-1-infected; and group IIb (n = 426), those who were HIV-1-uninfected. CRC were defined as parenchymal consolidations or nodular disease lasting 3 months or more or increased bronchovascular markings or reticular densities lasting 6 months or more. Morbidity was assessed by CD4 counts, viral load, the presence of low oxygen saturation, wheezing, tachypnea, crackles, and clubbing.

RESULTS

The cumulative incidence of chronic radiographic lung changes in HIV-1-infected children was 32.8% by 4 years old, with increased bronchovascular markings or reticular densities being most common. Chronic changes were associated with lower CD4 cell counts and higher viral loads. Resolution of these chronic changes was associated with decreasing CD4 cell counts but not with lower rates of clinical findings, viral load, or difference in survival.

CONCLUSION

With increased survival, CRC are becoming more common. The resolution of these changes may indicate immunologic deterioration rather than clinical improvement.

Radiographic appearance of follicular bronchitis in children

OBJECTIVE

The purpose of this study was to present the first radiographic description of a newly described disease in children, follicular bronchitis.

MATERIALS AND METHODS

We retrospectively reviewed the medical history and radiographs of eight children with biopsy evidence of follicular bronchitis.

RESULTS

All eight infants had findings on initial radiographs that were consistent with viral inflammatory disease. The clinical features of follicular bronchitis started by 6-8 weeks old and peaked between about 2 and 3 years old. After several months of the disease, the infants' radiographs showed a more obvious interstitial pattern. When these children were approximately 3 years old, the radiographic findings began to return to normal. Four children have been followed up for at least 8 years. By that age, the clinical symptoms of respiratory disease have disappeared. All four children tested after they were 8 years old had abnormal results of pulmonary function tests.

CONCLUSION

The combination of unique clinical features associated with the radiographic appearances we describe should allow radiologists to suggest the diagnosis of follicular bronchitis.

Radio frequency electromagnetic exposure: tutorial review on experimental dosimetry

Radio frequency (RF) dosimetry is the quantification of the magnitude and distribution of absorbed electromagnetic energy within biological objects that are exposed to RF fields. At RF, the dosimetric quantity, which is called the specific absorption rate (SAR), is defined as the rate at which energy is absorbed per unit mass. The SAR is determined not only by the incident electromagnetic waves but also by the electrical and geometric characteristics of the irradiated subject and nearby objects. It is related to the internal electric field strength (E) as well as to the electric conductivity and the density of tissues; therefore, it is a suitable dosimetric parameter, even when a mechanism is determined to be "athermal." SAR distributions are usually determined from measurements in human models, in animal tissues, or from calculations. This tutorial describes experimental techniques that are used commonly to determine SAR distributions along with the SAR limitations and unresolved problems. The methods discussed to obtain point, planar, or whole-body averaged SARs include the use of small E-field probes or measurement of initial rate of temperature rise in an irradiated object.

Radiologic localization of the laryngeal mask airway in children

In the absence of data on the anatomic localization of the cuff of the laryngeal mask airway (LMA) in children, radiologic images were obtained from 50 infants and children (aged 1 month to 15 yr) undergoing diagnostic radiologic procedures during halothane and N2O:O2 anesthesia. In 46 patients, the cuff of the LMA was in the pharynx and covered the laryngeal opening. The upper (proximal) section was adjacent to the base of the tongue at the level of C1 or C2 vertebrae pushing the tongue forward and its lower (distal) end was in the inferior recesses of the hypopharynx at the levels of C4 to T1 vertebrae. The cuff of LMA at this position between the base of the tongue above the epiglottis and below the laryngeal opening, covered the laryngeal aperture, forming a low pressure seal at the entrance of the larynx. In 37 of these 46 patients, a posterior deflection of the epiglottis was noted (< 45 degrees), and in only 9, the epiglottis was in the anatomic position. In four patients, the cuff of the LMA was located in the oropharynx. No correlation was found between the size of the LMA and the position of the epiglottis with respect to end-tidal CO2, respiratory rate, or the leak pressures. The size of the LMA, its anatomic location, and the position of the epiglottis had no significant effect on the respiratory parameters of spontaneously breathing children.

Randomized double-blind study of intravenous tocainide versus lidocaine for suppression of ventricular arrhythmias after cardiac surgery

To compare the therapeutic efficacy and safety of intravenous tocainide with that of intravenous lidocaine in patients with ventricular arrhythmias after cardiac surgery, 25 patients were randomized to either agent in a double-blind manner. Tocainide was given in 16 patients as a 250 mg bolus followed by a loading infusion of 500 mg over 15 minutes and a maintenance infusion of 33.3 mg/min. Lidocaine was administered in 9 patients as a 100 mg bolus followed by a loading infusion of 60 mg over 15 minutes and a maintenance infusion of 1.4 mg/min. Therapy was continued for 24 hours in initially responding patients. With analysis of 24-h taped electrocardiograms it was found that single premature ventricular complexes (PVCs) were suppressed by tocainide by more than 80% in 94% of patients and by lidocaine in 75% of patients (p = NS). Couplets and ventricular tachycardia events were eliminated in all patients by either drug. Multiform PVCs were abolished in 94% of the patients after tocainide and in 75% after lidocaine (p = NS). Average overall success over the 24 hours with more than 80% suppression of single PVCs and simultaneous elimination of higher forms of arrhythmia was 71% with tocainide and 59% with lidocaine (p = NS). Adverse effects were negligible, with only one patient in the lidocaine group developing diaphoresis without necessitating termination of therapy. Treatment rapidly produced and then maintained blood levels of 4-10 mg/l for tocainide and 1-4 mg/l for lidocaine. We conclude that intravenous tocainide is well tolerated and has comparable efficacy to lidocaine in the acute therapy of postcardiac surgery ventricular arrhythmias.

Surgical therapy for drug-refractory ventricular tachycardia: results with mapping-guided subendocardial resection

Surgical therapy with mapping-guided subendocardial resection was used in 30 patients with drug-refractory ventricular tachycardia. Results of preoperative, intraoperative and postoperative electrophysiologic evaluation and long-term clinical follow-up are reported. Left ventricular aneurysm was located in the inferior wall in 8 patients and in the anterior wall in 22. Left ventricular mapping was performed in 15 patients preoperatively and in all 30 patients intraoperatively. Subendocardial resection was supplemented with cryoablation in 26 patients and with laser photocoagulation in 4. Coronary bypass surgery was performed in 27 patients. The surgical mortality rate was 10%; the three deaths were due to cardiogenic shock, pneumonia and sepsis, respectively. At postoperative electrophysiologic study, ventricular tachycardia was inducible in 8 (30%) of 27 patients. Previously ineffective antiarrhythmic drugs were effective in preventing the induction of ventricular tachycardia in four of these eight patients. Two of the remaining four patients received an automatic implantable cardioverterdefibrillator; the other two were treated with amiodarone. At a mean follow-up period of 18 +/- 17 months (range 1 to 52), there has been one sudden death and one nonfatal recurrence of ventricular tachycardia in the 18 patients without inducible arrhythmias postoperatively. Among the eight patients with inducible ventricular tachycardia after subendocardial resection, there has been one nonfatal ventricular tachycardia recurrence. Thus, among the 27 patients surviving surgery, 17 (63%) were cured with surgery alone, and another 7 (26%) had their ventricular tachycardia controlled with drugs (n = 5) or the defibrillator (n = 2). Inability to completely map the tachycardia, a clinical history of cardiac arrest requiring resuscitation and the presence of myocardial infarction within 2 months predicted postoperative arrhythmia inducibility and recurrence.

Cor triatriatum associated with partial anomalous pulmonary venous connection to the coronary sinus: echocardiographic and angiocardiographic features

An infant girl is described who had cor triatriatum and partial anomalous pulmonary venous connection of the left pulmonary veins to the coronary sinus, the first report of this combination of lesions. The infant also had a Dandy-Walker malformation and multiple facial and intrathoracic hemangiomas. The cardiac diagnosis was made by two-dimensional echocardiography. Cardiac catheterization and angiography confirmed the findings and also demonstrated a persistent left superior vena cava draining to the coronary sinus. The infant underwent successful surgical repair. Partial anomalous pulmonary venous connection and left superior vena cava not infrequently are associated with cor triatriatum. Although two-dimensional echocardiography is sensitive for the detection of cor triatriatum, preoperative cardiac catheterization is necessary to identify unequivocally systemic and pulmonary venous connections.

Transaxial tomography: an alternative to computerized tomography in pediatric orthopedic problems

Because of the information it provides, computerized tomography has gained wide acceptance. However, the radiation delivered is considerable, and the gonads cannot be shielded effectively. Transaxial tomography also produces a cross-sectional image. While the image has less resolution, it is obtained at a fraction of the exposure. The use of transaxial tomography in several clinical situations is outlined here.

Application of Horton-Devine principles to the repair of hypospadias

We describe the results and complications of the Horton and Devine techniques for repairing hypospadias in 140 children. The V-shaped glandar flap plasty was done in all patients, either as part of a 1-stage operation in some or as the final step in a staged procedure in others. The principles of Horton and Devine were found useful not only in primary repairs but also in achieving a satisfactory result in secondary and complicated cases. Urethrocutaneous fistula was the most common complication. With an average of 1.5 operations per patient the functional and cosmetic results have been excellent.

Scoliosis secondary to fractures of the transverse processes of lumbar vertebrae

Fractures of the transverse processes of the lumbar vertebrae may be difficult to identify radiographically because they are often obscured by gas and feces. With unilateral fractures, there is often scoliosis convex to the side of the fractures. We propose that this may be due to the ineffective action of the ipsilateral quadratus lumborum muscle which inserts into the transverse processes. The unopposed action of the contralateral quadratus lumborum results in scoliosis convex to the side of the fracture(s). Awareness of this cause of scoliosis can help in differentiating it from scoliosis caused by other painful abdominal processes, and may aid in recognition of the fracture(s).