Functional Assessment of Cancer Therapy – General version (FACT-G)

Abstract

The Functional Assessment of Cancer Therapy – General version (FACT-G) is a widely utilized, multidimensional instrument designed to measure the Quality of Life (QoL) specifically related to the experience of cancer patients. Developed as the core module of the FACT Measurement System, the FACT-G provides a robust assessment of four primary domains of well-being: Physical, Social/Family, Emotional, and Functional. It is applicable across diverse cancer diagnoses and stages, serving as a foundational tool for clinical trials and routine outcome monitoring. The scale is also adapted for use with family caregivers, recognizing the comprehensive impact of the illness.

Keywords

FACT-G, Quality of Life, Health-Related Quality of Life, cancer assessment, psycho-oncology, functional status, physical well-being, emotional well-being, caregiver burden.

Authors

David Cella, et al.

Purpose

The primary purpose of the FACT-G is to provide a standardized, reliable, and validated measure of Health-Related Quality of Life (HRQOL) in individuals diagnosed with cancer. It is intended to capture the subjective experience of patients regarding their symptoms, functional capacity, and overall psychological and social adjustment to their illness and treatment. By quantifying these domains, the FACT-G allows clinicians and researchers to monitor changes in patient well-being over time, evaluate the effectiveness of cancer treatments (including supportive care interventions), and inform clinical decision-making.

The instrument is designed to be highly sensitive to changes in health status that are common during cancer treatment, such as fatigue, pain, nausea, and emotional distress. Furthermore, the existence of parallel versions, such as the Family Caregiver Version, extends its utility to assess the indirect impact of the disease on the patient’s support system, providing a holistic view of the illness experience.

Construct

The FACT-G measures the construct of Health-Related Quality of Life (HRQOL) through four distinct yet interrelated dimensions of well-being. This multidimensional approach is rooted in the understanding that QoL encompasses more than just physical symptoms; it includes psychological resilience, social support, and the ability to maintain daily activities. The scale items reflect the patient’s perspective over the preceding seven days, capturing current functional status and symptom burden.

The four core domains (subscales) measured by the FACT-G are:

• Physical Well-Being (PWB): Focuses on somatic symptoms, treatment side effects, physical energy levels, and pain.
• Social/Family Well-Being (SWB): Assesses relationships with friends and family, communication regarding the illness, and emotional support received.
• Emotional Well-Being (EWB): Measures feelings of sadness, nervousness, hope, acceptance, and worry regarding the illness and mortality.
• Functional Well-Being (FWB): Evaluates the ability to work, enjoy life, sleep well, and engage in usual recreational activities.

Validity

The FACT-G demonstrates strong evidence of construct validity, consistently aligning with theoretical expectations regarding HRQOL measurement in oncology settings. Studies have repeatedly shown that FACT-G scores correlate logically with other validated measures of physical functioning, symptom distress, and global QoL indicators. Known-groups validity has been established by demonstrating that FACT-G scores successfully differentiate between patients with differing clinical statuses (e.g., performance status, disease stage, or treatment toxicity).

Further validation efforts confirm its discriminant validity, ensuring that the four subscales measure unique aspects of well-being while still contributing to an overall QoL score. The scale’s responsiveness to clinical change (sensitivity to change) is a crucial aspect of its validity, confirming its utility in longitudinal studies where treatment efficacy is assessed via patient-reported outcomes.

Reliability

The FACT-G exhibits high levels of internal consistency reliability, as measured by Cronbach’s alpha. The overall scale and its subscales generally meet or exceed the standard thresholds for robust psychological measurement (typically α > 0.70).

The provided reliability coefficients for both the Patient version and the Family Caregiver version demonstrate strong internal consistency across the total scale and its components:

• Total scale of the FACT-G: alpha (0.91, 0.91)
• Physical Well-Being subscale (PWB): alpha (0.89, 0.85)
• Functional Well-Being subscale (FWB): alpha (0.87, 0.88)

While the Social/Family Well-Being (SWB) and Emotional Well-Being (EWB) subscales show slightly lower, but still acceptable, coefficients, the consistency across both patient and caregiver populations supports the scale’s stability and generalizability.

• Social / Family Well-Being subscale (SWB): alpha (0.71, 0.80)
• Emotional Well-Being subscale (EWB): alpha (0.71, 0.67)

Factor Analysis

Factor analysis studies, including Confirmatory Factor Analysis (CFA), consistently support the hypothesized four-factor structure of the FACT-G. The instrument is intended to be composed of the four distinct subscales (PWB, SWB, EWB, FWB), which align with the conceptual model of HRQOL in cancer care. These analyses confirm that the items cluster appropriately within their respective domains and that the subscales are sufficiently independent while contributing significantly to a higher-order factor representing overall QoL.

While the source material does not provide specific factor loadings, the psychometric literature widely confirms that the FACT-G structure is robust and stable across various cancer types, treatment modalities, and cultures, reinforcing its utility as a core measure in oncology research.

Instrument

Test Type: Self-report questionnaire / Patient-Reported Outcome (PRO) measure.

Format: 27-item questionnaire (General version, excluding cancer-specific modules). Responses are graded on a 5-point Likert scale.

Language Available: The FACT-G is one of the most widely translated QoL instruments globally, available in over 60 languages.

Population Group: Adult patients diagnosed with any form of cancer; also applicable to their family caregivers.

Age Group: Adults (18+).

Population Details: Applicable across all stages of cancer, from diagnosis through treatment, survivorship, and palliative care.

Test Methodology: Respondents are asked to rate how true each statement has been for them during the past seven days, ranging from 0 (Not at All) to 4 (Very Much). Higher scores generally indicate better Quality of Life. Some items are reverse-scored to maintain consistency in interpretation.

Keywords

HRQOL, psycho-oncology, patient-reported outcomes, FACT measurement system, well-being, functional status, cancer treatment evaluation, clinical trials.

Authors

Author ORCID Identifier: N/A (Information not provided in source; primary author is David Cella)

Affiliation Email addresses: N/A (Information not provided in source)

Correspondence Address: N/A (Information not provided in source)

Permissions & Fee and Test Year

The FACT Measurement System, including the FACT-G, is proprietary and maintained by Functional Assessment of Chronic Illness Therapy (FACIT) organization. While use in non-funded academic research is often granted free of charge, formal permission must be obtained from FACIT for all uses. The original core version of the FACT-G was developed and published in the early 1990s (circa 1993-1997).

Reference’s

• Caldwell. S. M. (2003). The Family Well-Being Assessment Tool. In O. L. Strickland‚ & C. Dilorio. (Eds.)‚ Measurement of nursing outcomes. (2nd ed.) (pp. 75-88). New York: Springer Publishing Company.
• McDonald‚ G. W. (1979). Family well-being and quality of life: Humanistic concerns of the family impact analyst. The Family Coordinator‚ 28(3)‚ 313-320.
• Wisawatapnimit‚ Panarut. (2009). Assessment of Family Quality of Life Among Families with a Member who has Cancer. Vanderbilt University. Doctoral Dissertation.
• Cella, D. F., Tulsky, D. S., Gray, G., Sarafian, M., Linn, E., Bonomi, A., Silberman, M., Yellen, S. B., Winicour, P., Brannon, J., & Eckberg, P. (1993). The Functional Assessment of Cancer Therapy scale: development and validation of the general measure. Journal of Clinical Oncology, 11(3), 570-579.

The original PDF of this instrument content can be downloaded here: http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.475.7660&rep=rep1&type=pdf

Items of the Functional Assessment of Cancer Therapy – General version (FACT-G)

IMPORTANT: The following scale items must be preserved in their original language and must not be changed in any way.

The response options for all items are: 0-Not at All‚ 1-A Little‚ 2-Somewhat‚ 3-Quite a Bit‚ 4-Very Much.

Patient Version

PHYSICAL WELL-BEING

1. have a lack of energy.
2. I have nausea.
3. Because of my physical condition‚ I have trouble meeting the needs of my family.
4. I have pain.
5. I am bothered by side effects of treatment.
6. I feel ill.
7. I am forced to spent time in bed.

SOCIAL/FAMILY WELL-BEING

1. I feel close to my friends.
2. I get emotional support from my family.
3. I get support from my friends.
4. My family has accepted my illness.
5. I am satisfied with family communication about my illness.
6. I feel close to my partner (or the person who is my main support).
7. Regardless of your current level of sexual activity‚ please answer the following question. If you prefer not to answer it‚ please check this box 􀂉 and go to the next section. I am satisfied with my sex life.

EMOTIONAL WELL-BEING

1. I feel sad.
2. I am satisfied with how I am coping with my illness.
3. I am losing hope in the fight against my illness.
4. I feel nervous.
5. I worry about dying.
6. I worry that my condition will get worse.

FUNCTIONAL WELL-BEING

1. I am able to work (include work at home).
2. My work (include work at home) is fulfilling.
3. I am able to enjoy life.
4. I have accepted my illness.
5. I am sleeping well.
6. I am enjoying the things I usually do for fun.
7. I am content with the quality of my life right now.

Family Caregiver Version

PHYSICAL WELL-BEING

1. I have a lack of energy.
2. I have nausea.
3. Because of my physical condition‚ I have trouble meeting the needs of my family.
4. I have pain.
5. Are you currently taking any medication or receiving other medical treatments? 􀂉 No. 􀂉 Yes. If yes‚ I am bothered by side effects of my treatment.
6. I feel ill.
7. I am forced to spent time in bed.

SOCIAL/FAMILY WELL-BEING

1. I feel close to my friends.
2. I get emotional support from my family.
3. I get support from my friends.
4. My family has accepted the illness.
5. I am satisfied with family communication about the illness.
6. I feel close to my partner (or the person who is my main support).
7. Q. Regardless of your current level of sexual activity‚ please answer the following question. If you prefer not to answer it‚ please check this box 􀂉 and go to the next section. I am satisfied with my sex life.

EMOTIONAL WELL-BEING

1. I feel sad.
2. I am satisfied with how I am coping with my family member’s illness.
3. I am losing hope in the fight against my family member’s illness.
4. I feel nervous.
5. I worry about my family member dying.
6. I worry that my family member’s condition will get worse.

FUNCTIONAL WELL-BEING

1. I am able to work (include work at home).
2. My work (include work at home) is fulfilling.
3. I am able to enjoy life.
4. I have accepted my family member’s illness.
5. I am sleeping well.
6. I am enjoying the things I usually do for fun.
7. I am content with the quality of my life right now.