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Delivery of Pharmacogenetic Testing with or without Medication Therapy Management in a Community Pharmacy Setting

Authors Haga SB , Mills R , Moaddeb J, Liu Y, Voora D

Received 13 April 2021

Accepted for publication 16 June 2021

Published 9 July 2021 Volume 2021:14 Pages 785—796

DOI https://doi.org/10.2147/PGPM.S314961

Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 2

Editor who approved publication: Dr Martin H Bluth



Susanne B Haga, Rachel Mills, Jivan Moaddeb, Yiling Liu, Deepak Voora

Center for Applied Genomics & Precision Medicine, Duke University School of Medicine, Durham, NC, 27708, USA

Correspondence: Susanne B Haga Email [email protected]

Objective: The delivery of pharmacogenetic (PGx) testing has primarily been through clinical and hospital settings. We conducted a study to explore the feasibility of delivering PGx testing through community pharmacies, a less-studied setting.
Methods: We conducted a cluster randomized trial of community pharmacies in North Carolina through two approaches: the provision of PGx testing alone or PGx testing with medication therapy management (MTM).
Results: A total of 150 patient participants were enrolled at 17 pharmacies and reported high satisfaction with their testing experience. Participants in the PGx plus MTM arm were more likely to recall a higher number of results (p=0.04) and more likely to clearly understand their choices for prevention or early detection of side effects (p=0.01). A medication or dose change based on the PGx results was made for 8.7% of participants.
Conclusion: Limited differences were observed in the provision of PGx testing as a standalone test or combined with MTM. A limited number of treatment changes were made based on PGx test results. Patient acceptance of PGx testing offered through the community pharmacy was very high, but the addition of MTM did not impact patient-reported perceptions about PGx testing or medication adherence.

Keywords: pharmacy, pharmacogenetic testing, feasibility, patient experience

Introduction

Pharmacogenetic (PGx) testing is a cross-specialty application with a high likelihood of detecting an actionable result for many commonly prescribed medications. Unlike other clinical tests where test utilization is driven by specific clinical indications, PGx testing has several options for delivery with variability in clinical settings, types of clinical providers, and timing including pre-emptively, at the point-of-care when treatment is indicated, or post-treatment. With increasing attention to the implementation and delivery of PGx testing, identification of the barriers and facilitators in different clinical settings can help promote widespread integration of testing across specialties and practice settings. In addition, consideration of patient experiences can inform the development of strategies and resources to optimize comprehension of results, medication compliance, and sharing of results with providers.

To date, most of the PGx implementation studies and initiatives have been launched in specialty clinics or hospital settings. While the prescriber’s role in initiating testing and adjusting treatment based on test results is often a focus of these studies, in some programs, the pharmacist also plays a central role, such as operating a PGx consultation service, and/or serving as a liaison between the physician/clinic, testing laboratory, and sometimes, the patient. One critical role of the pharmacist is to assist with interpretation of results and convey the recommended changes in medication selection or dosing to the prescriber. Studies have reported a lack of pharmacist knowledge about PGx, but many efforts have been made to increase PGx content in pharmacy curricula and prepare new and practicing pharmacists to play a leading role in the use of PGx testing, seemingly outpacing similar educational efforts for prescribers.

An alternative approach to the delivery of PGx testing is in the community pharmacy setting. In this setting, testing can be offered by pharmacists to patients who are filling prescriptions for medications with known PGx interactions. Laboratory test ordering by pharmacists is overseen by state regulations, either as authorized providers or through a collaborative practice agreement with a physician(s). Similarly, pharmacists’ authority to initiate or modify prescriptions is limited to select medications, minor health conditions, and/or existence of collaborative practice agreements with a physician(s). However, a large majority of community pharmacists are still not able to make even these limited modifications. PGx testing may also be integrated into medication therapy management (MTM) provided by the pharmacist to consider both drug–drug and drug–gene interactions.

Although many factors can impact patient attitudes, community pharmacists have generally been considered as a trusted resource and often have long-term relationships with patients, providing increasingly more services with demonstrated patient benefits or equivalent to standard of care. Furthermore, the inclusion of pharmacists on provider teams and expanded clinical roles have demonstrated favorable patient outcomes. The delivery of PGx testing in this setting has been considered but not extensively investigated. Here we report the findings of our study to assess the feasibility of delivering PGx testing in a community pharmacy setting, either as a standalone test or delivered through an MTM session. We collected data from both participating patients and pharmacists about their experiences, as this was likely a unique experience for one or both parties. In addition, to ascertain the impact of PGx testing, we collected patient data regarding medication changes and adherence. Our findings can help inform delivery of PGx testing in community pharmacy settings and the role of pharmacists to facilitate integration of PGx results into therapeutic decisions.

Methods

Study Overview

Details of this study design have been previously described. In summary, a cluster randomized trial was conducted whereby community pharmacies were randomized to provide PGx testing (control arm) or PGx testing with MTM (intervention). In addition to having a recent (<1 year active) prescription of one of the specified medications (listed at bottom of Table 1), patient participants had to be 18 years of age or older to participate; patients were ineligible to participate if they previously underwent PGx testing for one of the targeted genes or had MTM services in the previous year. Buccal swab samples were collected from patients at the pharmacy and sent to Pathway Genomics for testing. Results for five genes (CYP2C19, CYP2C9, CYP2D6, VKORC1, and SLCO1B1) associated with the ten eligible medications (see) were returned to patients. The study protocol was approved by the Institutional Review Board of the Duke University Health System (Pro00068552) and registered in ClincalTrials.gov (NCT02937545). All participants were informed about the purpose of the study and written consent obtained prior to study commencement. The study was conducted in accordance with the Declaration of Helsinki.

Table 1 Characteristics of Participants Based on Pharmacist Chart Review Data and Pre/Post-Study Participant Surveys (Completed Both the Pre-Testing and Post-Testing Surveys)

Prior to enrolling patients in the study, pharmacists were required to attend a mandatory training session on PGx (continuing education credits provided). Informed consent was also obtained from pharmacists to collect survey data on knowledge and experiences. Participating patients and pharmacists were surveyed prior to and after the study. Data from pharmacist surveys and interviews regarding their experiences and will be published separately.

Pharmacist Sites

Thirty-six pharmacists at 22 independent community pharmacies in North Carolina participated in the study. Sites were selected through connections with independent pharmacies and contacting independent pharmacies listed in the National Community Pharmacist Association in North Carolina. The 22 sites were equally randomized to one of the two study arms (PGx only or PGx plus MTM). Sites without private counseling space were not eligible to be randomized to the PGx plus MTM arm and automatically assigned to the PGx only arm. A total of seven pharmacies (and 13 pharmacists) dropped out or were withdrawn due to low enrollment; five of those pharmacies were unable to enroll any participants. Seven of the remaining 15 pharmacies were in the PGx only arm and eight in the PGx plus MTM arm.

Patient Surveys

Patients who consented to PGx testing were invited to complete two online surveys: one at baseline and one after test results had been communicated. Patients were asked to complete the baseline survey following provision of the sample for testing; the follow-up survey was sent to patients after test results were available. The baseline survey collected demographic data, prior knowledge about PGx, medication beliefs through the Beliefs about Medicine Questionnaire (BMQ), and self-reported medication adherence. The follow-up survey gathered data on satisfaction with the testing experience in a community pharmacy setting, perceived value of testing, comprehension of test result, self-reported medication adherence, information-sharing, and an adapted assessment to measure the psychological impact of PGx results. As patient identifiers were not linked to the surveys to protect patient privacy, PGx test results could not be linked to survey responses to confirm responses. All surveys were administered through REDCap, a secure web application for building and administering online surveys.

LogBook

Pharmacists were provided with a folder for each participant enrolled from their pharmacy to document and record information about each participant. Specifically, pharmacists were asked to complete a form indicating dates of key testing activities (eg, consent obtained, physician authorization obtained, testing completed) as well as use of print or electronic educational materials provided by the study team to assist the pharmacist in discussing PGx testing, test results and whether a change in prescription based on the test results was made. We asked pharmacists to keep track of their activities related to the study, particularly interactions with each participant and their provider to assess feasibility of delivering PGx testing in a community pharmacy setting on a log sheet. In addition to the purpose of the interaction, pharmacists were asked to record the date, start and stop times, and mode of communication (in-person, phone, fax, email) for each interaction with each participant or participant’s provider.

Chart Review

Pharmacy adherence data were collected six months after test results were communicated for the enrolled participant and two matched controls. Each participating pharmacy identified two controls per each participant enrolled (2:1) and matched on drug, age and gender. Time on treatment, medication changes (dose/drug selection), and refill history (adherence) data were requested to be submitted with the six-month follow-up data from each pharmacy along with some demographic data based on chart reviews for participants and controls.

Data Analysis

Summary statistics were calculated for all data points collected from the logbook, chart review, and the survey questions. We tested for relationships between participant demographic variables and outcomes as well as survey responses. For categorical variables, we used Fisher’s exact test and for continuous variables (eg, age), we used the exact Wilcoxon rank sum test. To test if the demographic characteristics of the participants were independent of their tendency to complete both the pre- and post-testing survey, Fisher’s exact test was applied for race and gender (categorical variables), and exact Wilcoxon rank sum test for age (continuous variable). To determine if medication adherence behavior changed after testing, a McNemar’s Chi-squared test was applied with continuity correction. To detect changes in participants’ attitudes toward medications before and after the testing using the BMQ scale, exact Wilcoxon signed-rank tests for paired data were applied. To test for differences in survey responses by study arms, Fisher’s exact tests were applied for categorical variables, and exact Wilcoxon rank sum tests were applied for continuous variables. All reported p-values are two-sided and were considered significant at a Type I error level of 0.05. All analyses were performed with R software, with statistical tests using the stats and coin packages in R.

Results

Participant Recruitment

A total of 158 participants were recruited by 17 of 22 participating community pharmacy partners and consented to undergo PGx testing. Pre-testing data were collected and provided by the pharmacists for a total of 151 participants (incomplete pre-testing data were excluded from the dataset for four participants that did not receive physician authorization for testing and three participants from two of the pharmacies that withdrew from study). A chart-review dataset for one participant was not submitted, resulting in an analyzable dataset of 150 participants. Of those 150 participants, 38 (25%) completed both the baseline and follow-up survey.

The number of participants recruited for testing by the 17 pharmacies ranged from one to 20; if excluding the two pharmacies that withdrew mid-study due to low recruitment, the range was five to 20 participants per pharmacy. Forty-five percent of participants were recruited from pharmacies in the control arm (PGx only).

Participant Characteristics

Based on the chart review data submitted by pharmacists, 59.3% of participants enrolled and tested were female; the mean age was 61 years and 90.0% were White (Table 1). Of the 10 drugs for which testing was available, the top three drugs prescribed to participants in the study were Metoprolol (29%), Citalopram (18%), and Aripiprazole (13%). We did not observe any differences by gender or race in participant characteristics by study arms; however, the age of participants was significantly older in the PGx plus MTM arm (p=0.007).

Additional data were collected from the pre/post-study survey administered to participants. Fifty (33.3%) participants completed the baseline survey; as mentioned, 38 (25.3%) participants completed the follow-up survey (data shown in Table 1). Race was the only significant difference between the demographic characteristics of participants who completed the pre-testing survey only and those who completed both the pre- and post-testing survey (white participants were more likely to complete both the pre- and post-study surveys than non-white participants, p=0.014). Participants who completed both surveys were mostly female (63.2%), 70 years or older (23.7%), and white (92.1%). Fifty-five percent of survey participants were enrolled in the PGx-only study arm. Survey participants received testing from 14 participating pharmacies. Since the survey was completed anonymously, we are not able to link the survey data to the pharmacy data.

Health literacy was assessed by a single question, “How confident are you filling out forms by yourself?”: 29 (76.3%) responded extremely, 7 (18.4%) quite a bit, and 2 (5.3%) somewhat (the latter category is considered of limited or marginal health literacy skills). To assess general understanding of pharmacogenetics, participants were asked “How would you describe your understanding of how genes can affect the way you respond to a medicine?”: 11 (28.9%) indicated very well, 16 (42.1%) indicated somewhat well, 9 (23.7%) indicated “a little” and 1 (2.6%) responded “not at all” (one declined to answer). Only one participant (2.6%) indicated they or someone in their family had previously undergone PGx testing.

Test Ordering Process

After discussing testing with eligible patients, the pharmacist faxed a test authorization form to the prescriber for patients who consented to testing. Based on the case log notes, 97.5% of test authorization forms were signed and returned by the prescriber. Twenty-seven percent (41/150) required at least one reminder and seven percent (11/150) required two reminders. The average length of time between the date the form was faxed to the prescriber and the date that the specimen was sent to the testing laboratory was 29 days (range: 1–214) (note: we did not request the date for when the signed authorization form was returned). In 10 cases, from two pharmacies, a second sample collection was requested due to insufficient DNA from the original specimen.

Testing-Related Medication Changes

Based on the logbook data submitted by the pharmacist for each participant, a medication change was reported to have been made based on the test result in 8.7% of cases (13/150). In seven cases (4.7%), an alternative medication was prescribed and in six cases (4.0%), the dosing was changed. The most common medication for which a change was made was metoprolol (7), followed by citalopram (4), warfarin (1), and simvastatin (1). There was no significant difference with respect to study arm if a medication change was made. Regarding measures of medication adherence data submitted by the pharmacist, we observed no significant difference between participants enrolled in the PGx test only and the PGx plus MTM arm for either the proportion of days covered or the medication possession ratio. In comparison to control patients (no intervention), matched by age, race, and eligible medication for PGx testing for each enrolled participant, we did not observe any significant difference in proportion of days covered nor medication possession ratio.

Participants’ Self-Reported Medication Adherence

Before testing, 32 participants (84.2%) agreed or strongly agreed with the statement that they took all of their medication in the past seven days. No significant change in behavior was observed post-testing (78.9%; p=0.72). For post-testing, participants ≥50 years of age were more likely to report that they took all of their medications (p=0.04).

We further analyzed the reasons participants’ might not take all doses of their medication. For both pre-testing and post-testing, cost was the top reason noted for not taking medication as prescribed, followed by too busy, traveling or running out of medication. In addition, in the post-testing survey, concern about taking medications for the rest of their life was reported as a top reason.

Attitudes Toward Medications

We used the BMQ to assess participants’ attitudes toward medications. Of the four subscales, overall, participants’ beliefs in medications did not change for three subscales (harm, necessity, and concern) before and after testing and no significant differences were observed between study arms (Table 2). The exception was the score for the general overuse subscale, which assessed participants’ beliefs regarding medication over-prescription by health providers. This score significantly increased after testing (p=0.014). We explored these findings by study arm and observed a significant change only for the general overuse subscale in the PGX only study arm (p=0.01).

Table 2 Scores of Beliefs About Medication Questionnaire Subscales by Study Arm

Satisfaction with PGx Testing and Pharmacist Interactions

Almost all participants (97%) indicated that they were very satisfied with the amount of time the pharmacist spent explaining the test results; no significant difference by arm was observed. Eighty-seven percent were very satisfied with how well the pharmacist explained the test results and if any changes needed to be made to your medication based on the result; four participants indicated they were somewhat satisfied.

When asked to recall the phenotypic result (eg, poor metabolizer) for each of the five pharmacogenes (CYP2C19, CYP2C9, CYP2D6, SLCO1B1, and VKORC1) for which they were tested, 26.3% could not recall or were unsure of the results of one or more of the five genes. Three participants (7.9%) could not recall the result of any of the five genes, all of which were in the PGx only arm. Sixty-two percent of participants in the PGx only arm could recall all five genes compared to 88% in the PGx plus MTM arm (p=0.14). However, participants in the PGx plus MTM arm were significantly more likely to recall a higher number of genes than participants in the PGx only arm (p=0.04). There is no way to know if participants used the test report to answer the survey questions. As the surveys were anonymized and we did not have access to the test results, we were unable to confirm the accuracy of their recall. The likelihood of recalling the results for all genes was associated with education level (p<0.001). Furthermore, the majority (73%) did not recall any recommendation given by the pharmacist (though no recommendation may have been warranted depending on specific medication use and test report).

In the post-testing survey, after learning their results, all participants indicated that they would have taken the test in the first place; 71.1% indicated they would definitely still have taken the test and 28.9% indicted they probably would (no significant difference by intervention arms). If prescribed a new drug in the future and offered another PGx test, 71% indicated that they would definitely take the test and 21% would probably take the test. No significant difference between study arm was observed (p= 0.17).

Overall, just more than half of participants (20/38; 52.6%) indicated their knowledge of the PGx results and potential changes to their prescription definitely improved their confidence about the safety and/or effectiveness of their medication, with an additional 34.2% indicated it somewhat improved their confidence, though no significant differences were observed between study arms. Furthermore, no significant difference between study arms was observed with respect to participants’ view of whether the time spent with the pharmacist was worthwhile (p=0.20) (Table 3).

Table 3 Participant Responses Regarding New Information and Value of Time Spent with Pharmacist per Study Arm

Overall, participants reported a high level of satisfaction with their PGx testing experience (97.4%). In particular, participants reported a high level of satisfaction with the pharmacist for addressing questions about medications or testing (97.4%), for explaining their medications in an understandable manner (94.7%), for resolving any medication problems (84.2%), and for diet and exercise advice given (63.2%). No significant differences in participants’ level of satisfaction were observed between study arms.

Psychological Impact of PGx Testing and Information-Sharing

The majority of participants overall (68.4%) shared their results with either a doctor, a spouse/partner, other family members, or other people at the time of the post-testing survey. Twenty-six percent shared their results with more than one person. No significant difference between study arms was observed with respect to if participants shared the results or the number of people the results were shared with.

Sixty-three percent of participants overall indicated they felt relieved (often/sometimes) and 73.7% reported feeling happy (often/sometimes) about their test results (Table 4). Overall, 71.1% of participants indicated that they felt that they often/sometimes understood their choices for prevention or early detection of side effects. However, significantly more participants in the PGx plus MTM arm indicated that they often/sometimes understood clearly the choices for prevention or early detection of side effects compared to participants in the PGx only arm (p=0.01). Participants in the PGx plus MTM arm were also significantly more likely to indicate they had family support during the testing process (p=0.012) as well as satisfaction with their family communication or discussion about their test result (p=0.026).

Table 4 Psychological Responses to Testing in the Post-Testing Survey. P-values Calculated by Comparing Responses of Each Question (Grouped as Never/Rarely, and Sometimes/Often) Between Study Arms

We observed no significant difference in concerns and psychosocial issues associated with PGx testing between study arms using the MICRA survey instrument (mean(sd) for the PGx-Only Arm = 16.57 (7.59) and for PGx plus MTM arm = 16.41 (15.84); p-value = 0.1489). Among the negative impacts reported after receiving the PGx test results, 23.7% overall were sometimes uncertain about what their test result means about how they will respond to medications. Twenty-one percent were worried about their risk of having a side effect or their medication not working. Of the 29 participants who had children, eight (27.6%) overall reported that they were worried about the possibility of their children having side effects or being prescribed a drug not likely to work for them.

Discussion

The successful delivery of PGx testing in a community pharmacy setting pivots on at least three major stakeholders, namely the patient, the pharmacist, and the prescriber. With the novelty of PGx testing for all three groups, it is critical to consider the attitudes of each group as well as the setting in which PGx testing may be successfully delivered. In this study conducted in a community pharmacy setting, we evaluated the delivery process, outcomes, and pharmacists’ and patients’ experiences with PGx testing. Overall, we found positive experiences for both patient and pharmacist participants with the provision of PGx testing in this setting. However, the addition of MTM to PGx testing yielded limited benefit with respect to participant comprehension or attitudes toward medications. No change to medications based on PGx testing or medication adherence overall was observed.

Despite the novel experience of receiving PGx testing in a pharmacy setting, likely the first time for many, all participants indicated they would be very or somewhat likely to have PGx testing for another medication if indicated. The positive patient experiences reported in this study align with other reported experiences and positive patient/public attitudes regarding PGx testing and willingness to have testing. Participants reported high satisfaction with the delivery of PGx testing and pharmacists’ services, suggesting this could be an effective strategy for PGx testing.

The rather limited impact of MTM in conjunction with PGx testing may be due to differences in pharmacist experience, the complexity of patients’ medication histories, and the type of test results (normal/mixed results). If the benefit of MTM to the use and understanding of PGx test results is limited in a general population as demonstrated here, we suggest that MTM in combination with PGx testing may yield more benefits if offered to those patients reporting medication problems and/or taking a higher number of medications. However, we did observe that participants in the PGx plus MTM arm were significantly more likely to recall a higher number of genes than participants in the PGx only arm. Thus, the additional time with the pharmacist may have been helpful for some patients, but other educational resources or communication strategies are still likely needed since 25% of the study population could not recall their test results. Patient unfamiliarity with PGx testing, complex scientific concepts, and lack of relevance to current medication usage contribute to the lack of understanding and the challenges of effective communication. We and others have developed and evaluated patient educational tools to facilitate patient-provider communication about PGx testing. PGx educational materials included print, video, and digital-format that can be displayed on a tablet and be used when discussing purpose of testing, genotypes, phenotypes and the clinical significance for treatment.

With respect to the pharmacist burden, on average, there were seven tasks carried out, with the majority occurring during the pre-testing phase. The most time-consuming part may have been making follow-up calls to both patients and providers. For almost a quarter of patients who consented to testing, pharmacists had to follow-up with the prescriber about the test authorization request, and seven percent had to follow up twice. Because the time required for various tasks was not consistently reported, we were not able to accurately assess the overall time required to deliver PGx testing. To facilitate the delivery of PGx testing by pharmacists, more professional resources at the point-of-care may be helpful. While we provided a suite of patient educational aides, additional resources for providers as well as resources accessible to patients before and after their pharmacy visit could help alleviate the burden on pharmacists. In addition, a long-term relationship between pharmacists and prescribers may improve acceptance of recommendations to order PGx testing as well as better acceptance of results, and confidence that testing may be used by the pharmacist to ensure prescriptions are compatible with their genotype. This statement also holds true for the relationship between patients and their pharmacist.

Apart from our exploration of the feasibility of delivering PGx testing within a community setting, we assessed the impact on patient outcomes based on pharmacy records and self-reported survey responses. In comparison to the control population matched by age, race, and medication for each enrolled participant, we did not observe any significance difference in proportion of days covered nor medication possession ratio in the intervention arms. Other studies have reported a high number of treatment recommendations from a combined MTM plus PGx program. Many factors could account for this observation, including low number of abnormal test results, length of time on treatment, and patient or provider reluctance to modify prescriptions. Similar to our other study in a primary care setting, there were also no significant changes in participant attitudes regarding perceived harms or perceived necessity of medications. We speculate that the significant increase in score for perceived overuse of medications may be influenced by the older age of participants, as 42% were aged 60 years and older, and the likely higher number of medications. We also did not observe any differences in medication adherence, likely due to the already high level of reported adherence. A positive impact of PGx testing on adherence has been reported in studies for statins.

We should note some limitations of the study. In particular, the population size and limited response rate were key limitations. The invitation to participants to complete surveys was provided by the community pharmacist, and it is possible that not all eligible participants received it. With the relatively small number of participants, the results may not be applicable to the entire study population or other regions. In particular, the older study population may not be representative of a more evenly distributed study population with respect to medication use and experience and memory recall ability. Other potential limitations may be due to the choice of survey instruments, eg, single question literacy assessment, participant use of their test reports or other materials to complete the online survey, and participant use of other pharmacies or pharmacy benefit programs. In addition, as the study was based in independent community pharmacies in North Carolina, consumer and pharmacist demographics may differ compared to other regions, thereby limiting the generalizability of the dataset.

With the growing suite of health services offered by pharmacists in community pharmacy and the high level of trust from patients, this study demonstrates that the introduction of PGx testing in this setting may be feasible and integrated into community practices without traditional billing and practice structures like

MTM. The lack of observed significant findings between MTM and non-MTM arms suggests that PGx testing and return of test results can be deployed at community pharmacies in clinical services that are more targeted towards specific medications rather than the comprehensive medication review. The delivery of PGx testing in a community pharmacy setting was accepted by patients and feasible for pharmacists, although further investigation into the delivery model and prescriber and patient resources is needed.

Data Sharing Statement

The raw data set used for this study is offered by the corresponding author upon reasonable request.

Acknowledgment

This study was funded by the US National Institutes of Health (R01GM081416).

Disclosure

Susanne B Haga reports grants from US National Institutes of Health, during the conduct of the study. Dr Deepak Voora reports grants from NIH, during the conduct of the study; personal fees from Optum, outside the submitted work. The authors report no other conflicts of interest in this work.

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