access to anti-cancer drugs: many evidence-based treatments are off-label and unfunded by the pbs
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Access to anti-cancer drugs: Many evidence-based treatments are off-label and unfunded by the PBS_Internal Medicine Journal_Feb2012TRANSCRIPT
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Access to anti-cancer drugs: Many evidence-based treatments are off-label and
unfunded by the PBS1
James D Mellor MPharm (Hons), SpecCertCR(Onc), MRPharmS1,2
Pia Van Koeverden1,2
Sing Wang Kevin Yip2
Arti Thakerar BPharm1
Suzanne W Kirsa BPharm, Grad Dip Hosp Pharm FSHP1
Michael Michael MBBS (Hons), BSc (Hons), MD, FRACP3
1. Pharmacy Department, Peter MacCallum Cancer Centre, St Andrew’s Place, East
Melbourne, Victoria, Australia
2. Faculty of Pharmacy and Pharmaceutical Sciences, Monash University, Parkville, Victoria,
Australia
3. Division of Cancer Medicine, Peter MacCallum Cancer Centre, St Andrew’s Place, East
Melbourne, Victoria, Australia
Correspondence to:
Dan Mellor, Deputy Director of Pharmacy, Pharmacy Department, Peter MacCallum Cancer
Centre, St Andrew’s Place, East Melbourne, VIC 3002, Australia.
Tel: +61 3 9656 1213 Fax: +61 3 9656 1405 Email: [email protected]
Key Words: Oncology; Haematology; Off-label; Unlicensed; Chemotherapy; Reimbursement;
PBS
Word Count:
This is an Accepted Article that has been peer-reviewed and approved for publication in the Internal Medicine Journal, but has yet to undergo copyediting and proof correction. Please cite this article as an “Accepted Article”; doi: 10.1111/j.1445-5994.2012.02751.x
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Abstract: 250
Main Text: 2902
ABSTRACT
Background
The off-label use of a drug refers to a use outside the terms of its approval by the Therapeutic
Goods Administration’s (TGA). It is also possible to prescribe unlicensed drugs under the
Therapeutic Goods Administration’s (TGA) Special Access Scheme. A high rate of off-label
prescribing has previously been reported in cancer. Our study aimed to document the disparity
between clincial evidence-based guidelines for anti-cancer therapy, product approval, and
funding status of these agents within an academic tertiary/quaternary cancer centre.
Method
All chemotherapy protocols approved for use in our specialist oncology centre were assessed to
determine if the drugs were off-label or unlicensed for that indication based upon review of their
current product information. The Pharmaceutical Benefits Scheme (PBS) funding status for
each protocol was subsequently assessed.
Results
A total of 448 protocols, containing 82 different drugs, across 15 tumour groups were identified.
Overall, 189 (42.2%) of protocols were off-label and 3 (0.7%) were unlicensed. This resulted in
all 192 protocols being unfunded by the PBS. Of the 189 off-label protocols, 132 (69.9%) were
based on established evidence-based treatment guidelines and a further 39 (20.6%) were
based upon phase II or III clinical trial data.
Discussion
Over 90% of off-label protocols are supported by established treatment guidelines or published
peer-reviewed research even though the medications are not approved for that particular use by
the TGA. However, these off-label protocols are unfunded by the PBS: this results in a marked
inequality of access to appropriate medications for cancer patients across Australia.
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INTRODUCTION
There is a high prevalence of off-label prescribing in the cancer setting, where substantial
differences exist between indications approved by regulatory authorities and the standards in
clinical practice 1-3. Off-label prescribing refers to the use of a drug, which has been approved
by the Therapeutic Goods Administration (TGA), for indications that fall outside the terms of the
official ‘labelling’ or product approval. The TGA assesses the safety and efficacy of drugs for
each specific use, a process entirely separate to an application for government reimbursement
of a drug. A prescription may be off-label for a number of different reasons, including:
indication, dose, combination of medications, schedule and route of administration, as well as
duration and line of treatment4. Many physicians prescribe in this manner, generally based on a
high level of evidence, when there are no suitable alternatives and it may be the only treatment
option for cancer patients5.
The use of unlicensed anti-cancer drugs (drugs which have not been approved for any
indication) is less common. In Australia this is made possible under the TGA’s Special Access
Scheme (SAS). A drug may be unlicensed because it has never been submitted for evaluation,
it has been evaluated and rejected by the TGA, or the sponsor has withdrawn the drug from the
market (forced or voluntarily). The lack of regulatory approval for a specific indication does not
imply that the TGA disapproves of an off label use, but rather, indicates that they have not
reviewed the use of that particular medication in the clinical setting concerned. This often arises
as the relevant pharmaceutical company has not submitted the agent for that specific indication
(for logistical or market issues) or the agent is off-patent. The companies have no legislative
requirement or obligation to submit for an indication.
It is important to note that off-label and/or unlicensed prescribing is not necessarily unsupported
by clinical data, of variable quality, and often does form part of standard treatment
guidelines.2,3,6-8 Furthermore, these drugs may have been approved in another jurisdiction, e.g.
the Food and Drug Administration (FDA) in the USA.
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Patients need access to beneficial off-label treatments that are based on scientific evidence but
at the same time, they require protection from off-label interventions that are risky and
ineffective5. Whilst it is preferable that all uses of drugs and devices are supported by research,
this is not always available or feasible. Thus, it is the responsibility of the prescriber to ensure
that any off-label use of a drug or device is truly appropriate5.
An Australian study, which examined the prevalence of off-label or unlicensed prescribing at a
specialist cancer hospital, found that between 2001 and 2008, prevalence increased from 22%
to 39% (expressed as a percentage of total prescriptions) and in 2008, 85% of patients were
prescribed at least one drug which was unlicensed or off-label1. This study included all drugs;
anti-cancer drugs, supportive care drugs and drugs not directly related to cancer. An American
study which analysed the records of 185,000 cancer patients between 2003 and 2008 reported
that 68% of breast cancer patients and 95% of lung and bladder cancer patients were
prescribed drugs which were not FDA approved for these cancers. However, the majority of
patients (99.7%) received treatment within the National Comprehensive Cancer Network
(NCCN) guidelines, illustrating the level of disparity between standard treatment guidelines and
regulatory-approved indications8. These prescribing patterns were also supported by an Italian
study3.
In addition to the therapeutic issues associated with the off-label drugs, there are also cost
factors that need to be discussed with patients7. The Pharmaceutical Benefits Scheme (PBS)
list certain drugs, recommended by the Pharmaceutical Benefits Advisory Committee (PBAC),
for reimbursement based upon cost-effectiveness. The listing of a drug may be unrestricted
(but limited to TGA approved indications) or may be restricted to certain indications, which may
be narrower than the TGA approval. It is important to note that a drug cannot be listed or
reimbursed under the PBS for an unapproved (off-label) indication, i.e. they require licensing for
that indication by the TGA.
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Our study aimed to determine the proportion of chemotherapy protocols used in a specialist
cancer hospital that include off-label and unlicensed prescribing. Furthermore, we aimed to
identify which of these drugs are part of established treatment guidelines even though they are
not be approved by the TGA and therefore unfunded by the PBS.
METHOD
A complete list of chemotherapy protocols used at the Peter MacCallum Cancer Centre was
obtained from CHARM®, an cancer medicines management software program. Protocols were
added to the program from November 2008 onwards. Protocols were incorporated by the
relevant haematology and medical oncology subspecialty group based on the highest level of
evidence for each indication derived from national and international guidelines, meta-analyses,
phase III trials etc and are reviewed on an annual basis.
Each protocol was analysed and the drugs forming each protocol were compared against their
approved indications (and approved combination of drugs, where applicable) according to the
current Australian product information for all brands of the drug (sourced from MIMS and the
TGA website) in addition to the PBS criteria for their reimbursement status (from the PBS
website). This comparison was performed during December 2010. Clinical trial protocols and
protocols for supportive therapy (e.g. iron infusions for the treatment of anaemia) were
excluded. All other protocols were included in the analysis.
Within each protocol, drugs were categorised as being licensed (approved by TGA for that
specific indication), off-label (TGA approved for other indications or disease settings) or
unlicensed (not TGA approved). The drugs were also categorised according to their PBS
reimbursement status as either funded (divided into restricted or unrestricted) or unfunded.
Indication (i.e. cancer type) and drug combinations were considered when categorising drugs
and protocols. When categorising drugs, the disease setting for which they were approved (or
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PBS funded) was taken into account: i.e. if only for adjuvant therapy or only for metastatic
disease. Factors such as dose, infusion rates, dosage form, and place in therapy (e.g. as first
line therapy or as treatment for refractory disease in the metastatic setting etc.) were not
considered.
For each protocol, if one or more drugs were off-label, then the protocol was considered off-
label (or unlicensed where applicable). The same principle was applied to PBS listing; if one or
more drugs in a particular protocol were not eligible for PBS funding, then the protocol was
considered to be unfunded.
Where a protocol was considered off-label or unlicensed, a search of established cancer
treatment guidelines was conducted to verify the level of clinical evidence for that particular
regimen. Guidelines consulted included those of the National Comprehensive Cancer Network
(NCCN), British Columbia Cancer Agency (BCCA), Cancer Care Ontario (CCO) and the New
South Wales Cancer Institute (eviQ database). Where protocols were not contained within any
established consensus guidelines, a primary literature search was conducted to determine the
highest level of available evidence for its use. Primary literature searching was conducted using
the Medline and EMBASE databases.
RESULTS
A total of 448 protocols, containing combinations of 82 different drugs, were included in the
analysis. 192 protocols (42.9%) contained at least one drug which was being used in an off-
label or unlicensed indication or was being used in an off-label combination. Therefore all 192
protocols are unfunded by the PBS. Of those 189 off-label protocols (i) 132 (69.9%) were
supported by evidence from one or more established cancer treatment guidelines, (ii) 39 off-
label protocols (20.6%) were based upon phase II or III clinical trials, (iii) 18 (9.5%) protocols
had no available published evidence to support their use for the indication in which they were
being used.
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INSERT FIGURE 1 HERE
Over 50% of off-label protocols were identified for the following malignancies: head and neck,
central nervous system (CNS), skin, gastro-intestinal, gynaecological, lung,
transplantation/mobilisation, sarcoma. The majority of these having protocols based upon
established treatment guidelines ranging from 60-90%.
Three protocols (0.7%) contained drugs which are unlicensed in Australia. The three protocols
containing unlicensed drugs were not found in any established guidelines, but were supported
by primary research reports.
INSERT TABLE 1 HERE
In the six months from 1st July 2010 to 31st December 2010, 234 of the 448 protocols had been
prescribed for at least one cycle of treatment. The remaining 214 protocols remained as
options within CHARM® but had not been used within the selected six month period.
DISCUSSION
Off-label prescribing is an integral part of patient care in cancer. The results of this study
demonstrate that whilst the incidence of off-label prescribing is high, the majority of off-label
chemotherapy prescribing is supported by established clinical guidelines or evidence from
primary research reports. A much smaller number of protocols were supported by lower levels
of evidence such as phase II trials. A significantly smaller number of protocols had no
published evidence available to support their use for their intended indication, however most of
these protocols (drug combinations, doses etc.) were available in guidelines or published
primary literature for other diseases. This suggests that in certain instances, off-label
prescribing may be based upon extrapolation of clinical data supporting the efficacy of a therapy
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in one cancer to other cancers with similar pathophysiology, for example, head and neck
squamous cell carcinoma (SCC) therapies are used in the treatment of SCC of the skin.
Off-label prescribing of drugs has been reported for most types of cancer, but may be more
common in certain types of malignancy. For example, other studies have reported a lower
incidence of off-label prescribing in breast cancer when compared with bladder cancer or
hormone refractory prostate cancer4. Furthermore, off-label use of drugs was higher in cases
where there was no consensus on the optimum therapy and patients with metastatic and
advanced forms of rare malignancies. Off-label use is also more likely to be seen for drugs with
a narrow range of indications but with a broad spectrum of activity4.
Due to the aggressive nature of some cancers, prescribers may be more likely to consider off-
label drug use, especially for patients where all other licensed treatment options may have been
exhausted. Our analysis found that tumour types such as breast and leukaemia had a lower
incidence of off-label drug use than some of the rarer tumours perhaps reflecting the greater
availability of licensed drugs in these settings.
Lack of regulatory approval for chemotherapy drugs may be, in part, due to difficulty in obtaining
the required level of evidence to support an application for approval. For rare cancers, it may be
difficult to obtain sufficient numbers of participants to generate high quality clinical trial data for
an approval submission. For treatments for such tumours, the TGA approval may seem an
unrealistic goal, unless it was obtained via the orphan drugs pathway. Orphan drugs are defined
by the TGA as a drug that is intended to treat, prevent or diagnose a rare disease; or is not
commercially viable to supply to treat, prevent or diagnose another disease or condition. On the
other hand, even where high level clincial data exists for a rare cancer, pharmaceutical
companies may be reluctant to submit for licensing for marketing reasons or where the drug has
come off patent. Pharmaceutical companies are not mandated to submit to any regulatory
process, but on the other hand, they are the only organisations that have the resources to
enable a submission.
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This study demonstrated that a large proportion of protocols which were not TGA approved,
were included in evidence-based clinical guidelines (in many cases, from multiple institutions).
This indicates that there is a substantial, thus unacceptable, delay between incorporation of
clinical evidence into standard practice and/or guidelines and regulatory approval. Cancer is a
very research-intensive area of medicine and as such, the best available evidence is rapidly
changing, along with trends in standard treatments. Lengthy government approval processes
which drugs must be subjected to may be inappropriate in a cancer setting and result in failure
to incorporate the most recently available evidence in a timely fashion. This may be
problematic for prescribers who utilise the official product information to guide their prescribing
decisions as TGA approved product information often does not contain the most current or best
available evidence.
Following initial TGA approval of a drug, the TGA will only incorporate additional indications if
the company resubmits the drug for approval for use in these additional indications. This
process is costly and time consuming for pharmaceutical companies and is often not
undertaken. This is particularly so if there is perceived to be little financial incentive, but as well
the companies are under no legal obligation to submit new indications or change the Product
Information. This may be the case for older drugs which are not TGA approved for certain
indications, but have been incorporated into standard treatment guidelines for these indications
over long periods of time and are generally accepted as part of standard care. This is
particularly relevant where generic versions are available. This has resulted in older (cheaper)
chemotherapy drugs thus being used off-label and therefore unfunded by the PBS whilst many
expensive novel therapies are licensed and reimbursed.
Lack of TGA approval of drugs can also cause issues when attempting to conduct multinational
clinical trials in Australia. In head to head trials, the standard of care arm (comparator) may
contain drugs or protocols that are widely used overseas but not licensed by the TGA for the
specific indication being evaluated in the trial. There is a risk that in these situations local ethics
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committees may not allow the trial to proceed due to the lack of TGA approval of the standard
treatment arm.
PBS funding is related to a cost-benefit analysis and not necessarily directly related to TGA
approval (although drugs must be TGA approved before they may be considered for PBS
listing). Furthermore, drugs which are only administered in the in-patient setting are not PBS
funded in public hospitals, even if they are PBS listed for that indication. In our centre, non-PBS
funded drugs must be approved for use by the Pharmacy and Therapeutics Advisory Committee
(PTAC). This is a multidisciplinary committee that examines the clinical data and cost of
medicines. The funding in such cases therefore needs to come from either the treating
institution or the patient (from personal funds or occasionally private health insurance funds if
insured). Cancer patients ethically should not be denied access to active agents in the
treatment of their malignancy. On the otherhand, in the era of limited health resources, funding
bodies need to remain mindful of cost-effectiveness and issues of risk-benefit. This can result in
the best available treatments not being made available due to the limited nature of public funds.
There were 18 protocols that had no available published evidence to support their use for the
indication in which they were being used. It is possible these protocols were being used on the
basis of abstracts that were presented at conferences but were not published, or case reports,
or discussions with key international opinion leaders (based on their own experience). These
protocols tended to be used for rarer malignancies or in unusual circumstances of common
malignancies.
There was an agreement with the medical streams (haematology and medical oncology) about
which protocols could be entered into CHARM®. Those that contained drugs not approved by
the PTAC, were clearly labelled as “Individual Patient Approval (IPA) required” to indicate the
processes that must be followed before a patient could be put onto that particular protocol. An
IPA requires formal approval from the head of the relevant stream and notification in advance to
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the pharmacy department. All IPAs are tabulated and reported at the next PTAC meeting for
noting and discussion if necessary.
There are several limitations to this study. All protocols analysed in this project were sourced
from a cancer medicines management database at a single institution and it is possible, but
unlikely, that they may not reflect current clinical practice at other institutions. Protocols were
only evaluated according to the pathways or diseases by which they were categorised in the
computer database. This method does not account for prescribers who may use a protocol for
a different, uncategorised indication. Some protocols had ambiguous indication categorisation
(e.g. “Other GI”) which made determining whether the drugs used were being used in an off-
label setting difficult. A clinical judgement was made in this small number of cases to identify
the most likely indication of use. In addition, no assessment was made as to which protocols
could be administered in the out-patient or same-day patient setting as public hospitals cannot
claim drugs administered to inpatients from the PBS. This difference in funding arrangements
between inpatient and day/outpatients can act as a barrier to the appropriate use of drugs in
cancer patients.
Conclusion
Our study found that over 90% of off-label protocols used in cancer patients were supported by
established clinical guidelines and/or peer-reviewed research publications. Our study
demonstrates that despite the existence of such a high level of evidence, many cancer
treatments are not TGA approved. This results in a lack of PBS reimbursed treatment options
for cancer patients and may potentially impact on the success of their cancer therapy and thus
survival.
Moving forward it is imperative that professional groups work with key policy makers to develop
a framework for a rapid and logical oncology drug approval mechanism outside of the standard
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TGA process to prevent the process lagging behind the clinical evidence and remove a potential
barrier for patients accessing anti-cancer drugs.
REFERENCES
1. Mellor JD, Bensted KE, Chan PL. Off-label and unlicensed prescribing in a specialist
oncology centre in Australia. Asia-Pacific Journal of Clinical Oncology 2009;5(4):242-6.
2. Mullins CD, Montgomery R, Tunis S. Uncertainty in assessing value of oncology
treatments. Oncologist 2010;15 Suppl 1:58-64.
3. Roila F, Ballatori E, Labianca R, De Braud F, Borgonovo K, Martelli O, et al. Off-label
prescription of antineoplastic drugs: an Italian prospective, observational, multicenter
survey. Tumori 2009 Nov-Dec;95(6):647-51.
4. Leveque D. Off-label use of anticancer drugs. Lancet Oncol 2008 Nov;9(11):1102-7.
5. Dresser R, Frader J. Off-label prescribing: a call for heightened professional and
government oversight. J Law Med Ethics 2009 Fall;37(3):476-86, 396.
6. Minghetti P, Palmieri I, Selmin F. When authorized medicinal products are not available:
possible alternatives to meet legitimate expectations of patients. JPHSR 2010;1:107-12.
7. Abernethy AP, Raman G, Balk EM, Hammond JM, Orlando LA, Wheeler JL, et al.
Systematic review: reliability of compendia methods for off-label oncology indications. Ann
Intern Med 2009 Mar 3;150(5):336-43.
8. Stephen R, Knopf K, Reynolds M, Luo W, Fraeman K. Off-label Use of Oncology Drugs in a
Community Oncology EMR Database. International Society for Pharmacoeconomics and
Outcomes Research (ISPOR) 14th International Meeting; Orlando, FL 2009
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Figure 1 – Summary of Results
n=448 Protocols Containing 82 different drugs
across 15 tumour groups
Licensed Protocols
= 256 (57.1%)
Off-Label Protocols
= 189 (42.2%)
Unlicensed Protocols = 3 (0.7%)
Based on evidence-based treatment
guidelines 132 (69.9%)
Based on Phase II or III trial publications 39 (20.6%)
Based on low levels of evidence
18 (9.5%)
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Table 1 – Summary of off-label protocols (by tumour stream) and the level of evidence to support their use
Tumour Group Total no. of protocols
No. of off-label
protocols (%)
No. of off-label
protocols based on
established treatment guidelines
(%)
Total No. of off-label protocols based on primary
research reports
(Phase III or lower) (%)
No. of off-label
protocols with no
evidence for their
indication (%)
Breast 68 10 (14.7) 10 (100) 0 (0) 0 (0) CNS 15 11 (66.7) 7 (63.6) 4 (36.4) 0 (0)
Genitourinary 22 8 (36.4) 7 (87.5) 1 (12.5) 0 (0) GI 60 32 (53.3) 23 (71.9) 3 (9.4) 6 (18.7)
Gynaecological 31 16 (51.6) 11 (68.8) 2 (12.5) 3 (18.7) Head & neck 32 25 (78.1) 24 (96) 1 (4) 0 (0) Leukaemia 35 5 (14.3) 4 (80) 1 (20) 0 (0)
Lung 25 15 (60) 14 (93.3) 1 (6.7) 0 (0) Lymphoma 74 20 (27) 12 (60) 5 (25) 3 (15) Mobilisation 2 2 (100) 0 (0) 2 (100) 0 (0)
Myeloma 18 7 (38.9) 4 (57.1) 1 (14.3) 2 (28.6) Other 2 1 (50) 0 (0) 1 (100) 0 (0)
Sarcoma 26 14 (53.9) 8 (57.1 6 (42.9) 0 (0) Skin 19 12 (63.2) 7 (58.4) 1 (8.3) 4 (33.3)
Transplants 19 11 (57.9) 1 (9.1) 10 (90.1) 0 (0)
Total 448 189 (42.2) 132 (69.9) 39 (20.6) 18 (9.5)