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Recruitment of patients with lung cancer into a randomised clinical trial: experience at two centres
  1. S G Spiroa,
  2. N H Gowera,b,
  3. M T Evansb,
  4. F M Facchinia,
  5. R M Rudd on behalf of the Big Lung Trial Steering Committeeb
  1. aDepartment of Thoracic Medicine, University College London Hospitals NHS Trust, London, UK, bDepartment of Medical Oncology, St Bartholomew's and The London NHS Trust, London, UK
  1. N H Gower, London Lung Cancer Group, CRC and UCL Cancer Trials Centre, RF and UC Medical School, John Astor House, Foley Street, London W1P 8AN, UK email:n.gower{at}ctc.ucl.ac.uk

Abstract

BACKGROUND The entry of patients into randomised clinical trials (RCTs) in lung cancer is low. A study was undertaken to assess the reasons why patients with non-small cell lung cancer did not enter a trial involving randomisation to receive or not receive three courses of cisplatin based chemotherapy in addition to primary treatment by surgery, radiotherapy, or best supportive care.

METHODS The study was carried out in two large London institutions with a special interest in recruiting patients to lung cancer trials. Patients recently diagnosed as having non-small cell lung cancer were prospectively identified and followed to see whether they entered the RCT and, if not, to identify the main reasons why.

RESULTS Six hundred and eighty eight patients newly diagnosed with non-small cell lung cancer were identified between November 1995 and July 1998; 274 (39.8%) were deemed ineligible for the RCT for clinical reasons, most frequently their general condition rendering them unfit for chemotherapy. Another 161 (23.4%) were ineligible for logistical reasons—for example, they were discharged to centres not participating in the RCT or they were not considered for the trial at an appropriate time in their management. Of 253 potentially eligible patients, only 63 (24.9% of those eligible) agreed to enter the RCT and four entered another study. Of those who did not enter, 77 (41.4%) declined without stating a reason, 61 (32.8%) did not want chemotherapy, and only eight (4.3%) expressed a wish to have chemotherapy.

CONCLUSIONS Despite considerable time and effort, the proportion of patients recruited was small (9.2%). Many seen were ineligible but, of 253 potentially eligible patients, 186 (73.5%) refused to enter the RCT.

  • lung cancer
  • chemotherapy
  • randomised controlled trials
  • patient recruitment

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The entry of patients into multicentre studies remains unsatisfactory, with less than 5% of patients diagnosed with lung cancer in the UK entering trials.1 There is evidence, however, that if the patient sees an oncologist or visits a unit with a special interest in a malignant disease, the recruitment increases—12% in a breast cancer trial in Scotland2 and up to 45% of patients with lymphoma in British National Lymphoma Investigation studies.3

There are many reasons why patients are not entered into trials. Physicians may be unable to find sufficient time to explain the diagnosis, possible treatments, the aims of a study, the concept of randomisation, and then to obtain full written informed consent. Patients invited to participate may decline. In general, it is the younger, more educated patients who appear more willing to consider entry into a randomised controlled trial (RCT).4 However, lung cancer affects older people and, more often, those in lower socioeconomic groups.

The Big Lung Trial (BLT) is a multicentre study designed to confirm prospectively the findings of a recent meta-analysis5 that cisplatin containing chemotherapy may offer a survival advantage at five years when added to surgery, a small non-significant advantage when added to radical radiotherapy, and a 10% improvement in survival at one year when added to best supportive care. Once a decision is made regarding appropriate primary treatment, randomisation is to receive or not receive three courses of chemotherapy in addition to the planned primary treatment. The clinician may select from four alternative cisplatin based chemotherapy regimens. The BLT trial design, entry criteria, and follow up data requirements are kept simple and to a minimum. It was hoped that this would permit a considerable increase in recruitment compared with the national average. To assess this, we prospectively identified and followed patients diagnosed with non-small cell lung cancer (NSCLC) at two London centres to determine whether they entered the BLT, and to identify the reasons why they did not. This descriptive exercise may identify ways of improving entry into RCTs.

Methods

The study took place at University College London Hospitals NHS Trust between May 1996 and May 1997 and at St Bartholomew's and The London NHS Trust between November 1995 and July 1998. Research staff (NHG, FMF, MTE) identified all patients recently diagnosed as having NSCLC by visiting relevant hospital wards weekly and, where possible, from pathology/cytology records and bronchoscopy lists. Outpatients were identified if they attended the respiratory, radiotherapy, or oncology clinics as new patients. New cases of NSCLC seen in other speciality clinics— for example, care of the elderly—who were not admitted, investigated, or diagnosed pathologically may not have been identified. To be eligible for the BLT, a patient has to be fit enough to receive chemotherapy, not have a concurrent malignancy or a history of prior malignancy in the preceding three years, be able to give full informed consent, be randomised within 10 weeks of diagnosis or of completing primary treatment (surgery or radical radiotherapy groups), and have a confirmed diagnosis of NSCLC. Clinicians also need to feel that, for a particular individual, there is uncertainty regarding the potential benefit of chemotherapy.

For all patients identified a record was made of sex, date of birth, primary treatment, whether or not they entered an RCT and, if not, the main reason for non-entry. Where multiple reasons for non-entry were recorded for an individual, one main reason was used. During the survey reasons given were grouped together into common categories and are reported here.

Results

Six hundred and eighty eight patients were identified with a median age of 67 years (range 32–94); 488 (71%) were men. The outcome of considering these patients for the BLT is summarised in table 1 and fig 1.

Table 1

Summary of findings in 688 patients with newly diagnosed NSCLC considered for entry to Big Lung Trial (BLT)

Figure 1

Flow chart of outcome of considering 688 patients with newly diagnosed NSCLC for entry to RCT.

Of the 688 patients, 161 (23.4%) were ineligible for logistical reasons. Follow up or further treatment was planned for 90 of these patients at other hospitals not involved in the BLT and so they could not be considered for trial entry. Other logistical reasons for ineligibility occurred when patients were not considered for entry soon enough after diagnosis (n = 52) or when patients were lost to follow up (n = 19).

Two hundred and seventy four patients (39.8%) were deemed ineligible for the BLT for essentially clinical reasons—for example, clinical decisions not to give chemotherapy included frailty and poor performance status (n = 72), co-morbid conditions (n = 19), inadequate renal function (n = 16), change in prognosis during primary treatment (n = 15), or an unresolving complication to their primary treatment (n = 6). For 21 patients there were language or comprehension barriers to obtaining consent and a further three patients were felt likely to be poorly compliant with treatment. Two patients were considered to be too depressed for the trial to be discussed. For 11 patients there was a change in their diagnosis during treatment—for example, no malignancy was found at operation or their pathology was unclear.

Although many patients were therefore considered unfit for chemotherapy, 84 patients (12.2%) were ineligible because the clinician felt they should be offered chemotherapy. The latter group were younger with a mean age of 58.1 years compared with 66.9 years for the other non-entrants (difference between means 8.8 years, 95% CI 6.6 to 10.9).

Ineligibility due to prior or concurrent other malignancy was recorded in 25 patients (3.6%).

Of 253 eligible patients (36.8% of the total), only 63 (24.9% of those eligible) entered the BLT. Four patients entered other treatment trials. One hundred and eighty six eligible patients (73.5%) refused to enter the BLT. Refusal rates were highest in the surgical group (83.5% of those asked) and similar in the radiotherapy (67.5%) and best supportive care groups (68.6%). Patients were not asked why they were refusing and 77 (41.4%) refused without stating a specific reason. Of those who volunteered a reason, the most common was not wanting chemotherapy (61 patients, 32.8%). Only eight patients were recorded as requesting chemotherapy (4.3%).

The 63 BLT entrants included a higher proportion of men than the non-entrants (87.3% and 69.2%, respectively, p = 0.003, χ2 test) and a younger mean age (61.3 and 65.7 years, respectively, difference between means 4.4 years, 95% CI 1.9 to 6.9).

Discussion

The overall proportion of patients randomised in the BLT was 63 of 688 (9.2%) although four others entered alternative treatment trials. This proportion is higher than the 5% commonly quoted, but it represents the result of a concerted, organised effort to identify all patients with NSCLC in two large institutions and to spend adequate time discussing the trial with those eligible.

The lessons learnt from this study emphasise many of the problems encountered in entering patients to randomised trials. A large proportion of patients were ineligible for clinical reasons (39.8%). General frailty was the commonest reason, which is to be expected in a disease that predominantly affects the elderly and includes patients of all presentations, including advanced disease. The proportion is similar to that quoted with other common cancers.6

Despite a reported willingness amongst cancer patients to participate in clinical research,7 we could not confirm this view with 73.5% of eligible patients refusing entry. The highest refusal rate was among patients who had already received potentially curative primary treatment. When told they have lung cancer, patients wish to know their primary treatment and, if it is surgery or radical radiotherapy, their focus tends to be entirely on this. If they are also told of an RCT to consider after the primary treatment, they are likely not to remember when the time comes to decide.8Communication between the respiratory physician, surgeon, radiotherapist, oncologist and patient may not be adequate, and multidisciplinary clinics might overcome this problem. Patients with advanced disease, once informed of their diagnosis and incurability, may not be in a suitable frame of mind to focus on the complexities of an RCT.

We found that the most common reason for eligible patients declining to enter the trial was not wanting chemotherapy. There was considerable concern from patients who had already received a radical treatment which they believed likely to be curative and who did not wish to undergo further potentially toxic treatment of uncertain benefit. Even among those who had received no other specific treatment, many were averse to chemotherapy of which there still appears to be a genuine fear. Statements included: “It frightens me”, “I want to die with my hair on”, “Chemotherapy is no good for me—it's the treatment that kills people”. Family influences were also often explicit with relatives dissuading patients from potentially toxic treatment.

The results of this survey do not concur with previous reports that patients may accept a high degree of toxicity as acceptable in search of cure.9 Our results approximate more closely to the findings of Silvestri et al 10who reported that, even after receiving chemotherapy and then being asked whether it was worthwhile for a possible survival advantage of three months, most patients said they would have refused initial treatment. The fact that the two alternatives to which randomisation was sought in the BLT are so different—that is, chemotherapy or no chemotherapy—is probably an important factor affecting the willingness of patients to participate.

Clinical opinions on the value of chemotherapy for NSCLC differ widely, hence the need for the BLT. It is noteworthy that a clinical decision to administer chemotherapy eliminated 84 otherwise eligible patients (12.2% of all patients) from participation in the trial although, prior to the publication of the NSCLC meta-analysis, the attitude of 698 physicians treating NSCLC in the UK was extremely negative for the potential of chemotherapy.11

Explaining a randomised trial and obtaining informed consent is time consuming and more difficult for the clinician than simply recommending a course of treatment. The clinician may also feel that entry into an RCT may affect the doctor/patient relationship—a view held by 73% of physicians asked to enter patients into a large trial of surgery for breast cancer.12 A further 38% experienced difficulty with the informed consent in that study.

The problems experienced in recruiting to lung cancer trials are similar to those in other malignancies13 and perhaps one of the most important elements is time to discuss, explain and listen—an entity of which many doctors have too little.14It has to be hoped that the current national indicators recommending establishment of a multidisciplinary approach for all patients diagnosed with lung cancer will improve their overall care and the potential for entry into RCTs.

References

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