Toward Patient-Centered Drug Development in Oncology.


As an oncologist, when I sit with patients to discuss starting a new chemotherapy regimen, their first questions are often “How will it make me feel?” and “How did patients like me feel with this treatment?” Regrettably, this information is generally missing from U.S. drug labels and from published reports of clinical trials — the two information sources most commonly available to people trying to understand the clinical effects of cancer drugs.

In 2011, 15 hematology–oncology drugs were approved by the U.S. Food and Drug Administration (FDA). In only one case — that of ruxolitinib for the management of myelofibrosis — was symptom information included in the portion of the label that manufacturers can legally use for marketing purposes. In fact, ruxolitinib was the first cancer therapeutic in more than a decade for which symptom information was included in a U.S. drug label.

Cancer-drug labels stand in sharp contrast to labels for other types of drugs, about 25% of which list the drugs’ effects on patients’ symptoms or functioning.1 That disparity is surprising, given how common symptoms and functional impairment are in patients with cancer and how toxic oncology drugs can be.

The FDA has taken several recent steps toward encouraging inclusion of the patient perspective in drug development. It issued highly influential guidance on the use of patient-reported outcomes (PROs) in drug development,2 collaborated with the Critical Path Institute and industry to form the PRO Consortium with the aim of developing robust symptom-measurement tools, and obtained support from Congress in the fifth reauthorization of the Prescription Drug User Fee Act (PDUFA) to expand its internal expertise on the methodology of measuring PROs. (Unfortunately, allocated PDUFA funds have been withheld, which substantially impairs the FDA’s ability to implement planned patient-centered programs.)

These FDA efforts are evident in the ruxolitinib label and in the label for abiraterone acetate, approved this year for metastatic prostate cancer, which describes beneficial delays in time to the development of pain and the need for opioid use. Yet in preapproval trials in patients with cancer, symptom or functional-status evaluations that meet the FDA’s standards remain rare.

Some experts have argued that the FDA has raised the methodologic bar too high, whereas others accuse the pharmaceutical industry of paying too little attention to patients’ experiences. The bottom line is that both regulators and industry continue to prioritize survival-based end points rather than patient-experience end points in cancer-drug development.

Yet as patients live longer with cancer, they must increasingly choose among agents with varying efficacy–toxicity balances. And as approved drugs continue to yield only tiny median survival benefits (often measured in weeks), patients understandably want to know how their peers felt during and after a treatment. Moreover, payers increasingly seek information about patients’ comparative experiences with different products, because patients with worse symptoms or functional status utilize more supportive services.3

On the industry side, information about the patient experience is sometimes gathered in preapproval “pivotal” clinical trials (trials intended to provide evidence of the safety and efficacy of a product to support regulatory approval) through questionnaires focused on health-related quality of life (HRQOL). Often, this information is gathered to satisfy European regulators as well as payers, who seek a demonstration of economic value. Unfortunately, these end points are generally exploratory, and protocol-specified hypotheses and analytic or statistical plans are lacking. Data are commonly missing, and the results are rarely (or highly selectively) included in primary publications of trial results4 and are generally not intended for inclusion in U.S. oncology-drug labels.

We can, and ought to, aim higher. The examples of ruxolitinib and abiraterone, as well as experiences outside oncology, demonstrate six key steps that can move drug development toward a more patient-centered approach — one in which developers and regulators systematically consider patient perspectives in the design, conduct, and reporting of research .

In the case of ruxolitinib, the sponsor was a small company whose leadership was committed to including the patient perspective in key trial end points. When early clinical experience and published data for the target population revealed a constellation of symptoms related to the disease that were viewed as important by patients (step 1), the company began discussions with the FDA (step 2) and collaborated with academic researchers and a consulting firm to develop a patient-reported outcome measure (step 3). This measure was tested and refined through use with patients representing the target population before it was employed in a pivotal trial (step 4). The questions were loaded into a handheld device that patients used to report their own responses daily, with near perfect levels of compliance — despite their debilitating symptoms. The company had ongoing communication with and feedback from the FDA throughout this process.

Ruxolitinib demonstrates the particular value that PROs provide for understanding clinical benefits when studies are not designed to detect overall survival advantages and instead rely on end points such as tumor response, progression-free survival, or noninferiority. Although overall, ruxolitinib represents a success story, measurement of fatigue and HRQOL decrements — which are prevalent and widely viewed as important to patients — were not included as key end points because the FDA had methodologic concerns about them; these omissions resulted in a label containing an incomplete picture of the patient experience (steps 2 and 6 might have prevented this).

In the case of abiraterone, the company took a risk in its pivotal trial by expending statistical power to measure the time to opioid use among men with minimal baseline symptoms, when little was known about this end point in prostate cancer (step 4). It would also have been useful to include information about symptoms other than pain that are of interest to men with this disease; according to qualitative research conducted before the pivotal trial and formal patient-engagement activities, these would include symptoms such as tiredness or sleep disturbance (steps 1 and 5). Although a broad HRQOL tool was administered with positive results, there was no protocol-specified analysis plan for it, and it did not meet the FDA’s current methodologic threshold (steps 2 and 6).

For these key steps to be taken routinely, a fundamental shift in cultural orientation among drug developers and regulatory reviewers is imperative. Specifically, the patient experience of treatment with a given drug must be regarded as essential information about the properties of the product, without which our understanding of its risk–benefit profile is incomplete. This requirement applies equally to studies with end points based on survival (such as abiraterone) and those focused on tumor response (such as ruxolitinib).

Methodologic challenges exist but should not continue to be cited as insurmountable. They have been shown to be addressable in many trials,1 and multiple documents offering guidance on methods are available.2,5 Examples include minimizing and analyzing missing data, identifying meaningful score changes for questionnaires, and analyzing PRO data in nonblinded trials. Additional research is warranted both to advance measurement science in these areas and to develop measures in the public domain that meet regulatory standards.

But the principal barrier remains a failure to prioritize the identification and confrontation of these challenges up front. Moreover, when PRO measurement is left until the postmarketing phase, it is often too late to adequately measure outcomes in a comparative trial, which leaves the true effect of a product on the patient experience uncertain. Ideally, moving forward, whenever representatives of a pharmaceutical company and a regulatory agency sit down to discuss a product-development program, they will ask the same question my patients ask of me: “How does this product make people feel?”

Source: NEJM

 

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.