Acetaminophen for Cancer Pain

A Randomised, Placebo-controlled, Crossover Trial of Acetaminophen in Cancer Patients on Strong Opioids

Many patients with cancer pain have pain not fully controlled on opioids (eg. morphine). The addition of acetaminophen (Tylenol) to opioids in a small study in cancer patients demonstrated better pain control without an increase in side effects. This study will determine if regular acetaminophen improves pain control when added to strong opioids in patients with cancer pain.

Study Overview

• Status: Completed
• Conditions: Pain; Cancer
• Intervention / Treatment: Drug: Acetaminophen; Drug: placebo, sugar pill; Drug: acetaminophen

Detailed Description

Aim:

To assess whether regular oral acetaminophen can reduce pain in cancer patients already on a strong opioid regimen.

Rationale:

It is estimated that 75% of people with advanced cancer suffer significant pain. Many of these people continue to have pain despite being on strong opioids. The rationale behind adding an additional analgesic with a different mechanism of action is to attempt to improve analgesia without increasing side effects.

Overview:

This is a double blind, randomised placebo-controlled, crossover trial to evaluate whether the addition of regular acetaminophen can reduce pain in cancer patients already on a strong opioid regimen. The study will be performed in ambulatory cancer patients who have pain that is believed to be caused by their cancer, and who have already been stabilised on an opioid regimen of > 60mg/day of morphine equivalents. Each patient will be randomly allocated to receive either acetaminophen 1g qid or an identical appearing placebo qid for a seven-day period, and then crossed over to the other arm for a further seven-day period. Patients will complete daily pain diaries and weekly questionnaires (Brief Pain Inventory) and comparison will be made between the pain scores for the two treatment periods. Patient preference for the two treatment periods will also be evaluated.

Research Question:

A randomised, double-blind, placebo controlled crossover trial to determine if the addition of regular acetaminophen (1g PO qid) leads to improved analgesic control in adult cancer patients at Princess Margaret Hospital, who are already on strong opioids (> 60mg morphine equivalents/day) as evaluated by daily pain scores measured by Numerical Rating Scales (NRS) and the Brief Pain Inventory (BPI).

Hypothesis:

Regular acetaminophen improves pain control in cancer patients who are already on strong opioid regimens.

• Study Type: Interventional
• Enrollment (Actual): 12
• Phase: Phase 3

Contacts and Locations

Study Locations

• Australia
  • New South Wales
    • Sydney, New South Wales, Australia, 2139
      • Sydney cancer centre
• Canada
  • Ontario
    • Toronto, Ontario, Canada, M5G 2M9
      • Princess Margaret Hospital

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

Description

Inclusion Criteria:

1. Patients diagnosed with malignancy who have persistent pain which is believed by the investigator to be due to their cancer, and whose analgesic regimen has been stabilised on > 60mg of morphine equivalents/day.
2. Age > 18 years
3. Performance status of 0-2 by the European Co-operative Oncology Group (ECOG) Performance Scale
4. Sufficient English skills to be able to complete the daily diary, BPI and to understand the consent form
5. Signed informed consent

Exclusion Criteria:

1. Patient has no pain (0/10 on NRS).
2. Patients with severe pain are excluded, however once their pain control is optimised they are eligible.
3. Patient has received radiation therapy in the six weeks prior to commencing the study or is likely to require radiotherapy during the study period.
4. Patient has commenced, or had dose modifications, to either non-steroidal anti-inflammatory drugs (NSAIDs) or corticosteroids in the week prior to commencing the study, or during the two-week study period.
5. Patient has commenced chemotherapy or hormone therapy in the 4 weeks prior to the study or is expected to commence chemotherapy or hormonotherapy during the study period. Patients who are stable on long-term chemotherapy or hormones are eligible for this study. Patients who receive high dose steroids as antiemetics with their chemotherapy are eligible providing they are not receiving the steroids during the study period.
6. Patient has a contraindication to acetaminophen.
7. Use of acetaminophen in the 48 hours prior to commencement of the study period.

8. Abnormal laboratory values:

   • Absolute neutrophil count < 1.5 X 10^9/L and white blood cell (WBC) count < 3 X 10^9/L
   • Platelet count < 100 X 10^9/L
   • Liver transaminases > 2.5 X upper limit of normal
   • Bilirubin > 1.5 X upper limit of normal
   • Creatinine > 1.5 X upper limit of normal

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Randomized
• Interventional Model: Crossover Assignment
• Masking: Quadruple

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Active Comparator: A, 1, acetaminophen; acetaminophen	Drug: Acetaminophen; acetaminophen 1g po qid
Placebo Comparator: B placebo; placebo PO qid	Drug: placebo, sugar pill

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Time Frame
Patient preference for the acetaminophen or the placebo arm as assessed by asking the patient whether he/she preferred treatment period 1 or treatment period 2	Post completion of period 2
Differences in the mean pain intensity score as assessed by the daily average Numeric Rating Scale (NRS) pain score during the week given acetaminophen compared with the daily average NRS pain score during the week given placebo	post period 2

Secondary Outcome Measures

Outcome Measure	Time Frame
Symptoms possibly associated with acetaminophen use for each period using an NRS: feeling sick (nausea and vomiting)	post period 2
drowsiness	post period 2
constipation	post period 2
cold sweats	post period 2
overall sense of well being	post period 2
Total analgesic consumption in each treatment period	post period 2
Best and worst pain scores for each treatment period	post period 2
Pain relief obtained in each treatment period	post period 2
Effect of pain on functional ability	post period 2
Strength of preference for acetaminophen versus placebo on a 5-point scale	post period 2
Proportion of patients who had a preference for acetaminophen who perceived the improvement warranted taking the additional tablets	post period 2
Proportion of patients having a clinically significant improvement in pain (defined as an improvement in mean NRS of at least 33% during the week taking acetaminophen)	post period 2

Collaborators and Investigators

• Sponsor: University Health Network, Toronto
• Investigators: Principal Investigator: Janette Vardy, MD, University Health Network, University of Toronto; Principal Investigator: David Warr, MD, University Health Network, University of Toronto; Principal Investigator: Ian Tannock, MD, PhD, University Health Network, University of Toronto

Study record dates

Study Major Dates

• Study Start: July 1, 2005
• Primary Completion (Actual): December 1, 2012
• Study Completion (Actual): December 1, 2012

Study Registration Dates

• First Submitted: September 8, 2005
• First Submitted That Met QC Criteria: September 8, 2005
• First Posted (Estimate): September 9, 2005

Study Record Updates

• Last Update Posted (Estimate): March 8, 2016
• Last Update Submitted That Met QC Criteria: March 4, 2016
• Last Verified: March 1, 2016

More Information

Terms related to this study

• Keywords: acetaminophen; opioids; cancer pain
• Additional Relevant MeSH Terms: Pain; Neurologic Manifestations; Cancer Pain; Physiological Effects of Drugs; Peripheral Nervous System Agents; Analgesics; Sensory System Agents; Analgesics, Non-Narcotic; Antipyretics; Acetaminophen
• Other Study ID Numbers: ACETAPLAC