An Observational Study Evaluating the Productivity and Health-Related Quality of Life of People With HER2 Positive Breast Cancer

The WPAI is a patient-reported measure which assesses the effect of general health and symptom severity on work productivity and regular activities. The General Health questionnaire asks participants to estimate the number of hours missed from work due to reasons related and unrelated to their health problems, as well as the total number of hours worked in the preceding 7-day period. The percentage of participants reporting that they were employed (working for pay) was assessed at baseline along with absenteeism (work time missed), presenteeism (impairment at work/reduced on-the-job effectiveness), work productivity loss (overall work impairment/absenteeism plus presenteeism), and activity Impairment. The score range for the scales of the WPAI is between 0 (no effect) to 100% (max effect).

EQ-5D-5L is a standardized, participant-rated instrument for use as a measure of health outcomes. The EQ 5D-5L includes 2 components: the EQ-5D-5L descriptive system and the visual analogue scale (VAS). The EQ-5D-5L descriptive system provides a profile of the participant's health state in 5 dimensions (mobility, self-care, usual activities, pain/discomfort, and anxiety/depression). For each dimension, the participant is instructed to choose one of 5 levels that best describes their health on that day: "no problem" (1), "slight" (2), "moderate" (3), "severe" (4), or "unable/extreme" (5). The VAS is the participant's rating of their health on a scale of 0 "worst health you can imagine" to 100 "best health you can imagine".

FACT-B was used as the breast cancer-specific quality-of-life measure. FACT-B consists of 5 subscale scores pertaining to 4 well-being dimensions (physical, social/family, emotional, functional) and additional breast cancer concerns. A total overall score is the sum of all subscales. Response options were 0=not at all, 1=a little bit, 2=somewhat, 3=quite a bit, and 4=very much.