The study investigates the validity of doctors' assessments of cancer patients' quality of life, anxiety, and depression. Using the Karnofsky, Spitzer, Linear Analogue Self Assessment (LASA) Scales, and a series of simple scales, both doctors and patients completed the same forms simultaneously. The results showed poor correlations between the doctors' and patients' scores, indicating that doctors could not accurately determine patients' feelings. Additionally, the reproducibility of these scales was examined, revealing significant variability in results between different doctors. The study concludes that if a reliable and consistent method of measuring quality of life in cancer patients is required, it must come from the patients themselves, not from their doctors and nurses. The discussion highlights the importance of understanding the limitations of statistical correlations and the reliability of the instruments used.The study investigates the validity of doctors' assessments of cancer patients' quality of life, anxiety, and depression. Using the Karnofsky, Spitzer, Linear Analogue Self Assessment (LASA) Scales, and a series of simple scales, both doctors and patients completed the same forms simultaneously. The results showed poor correlations between the doctors' and patients' scores, indicating that doctors could not accurately determine patients' feelings. Additionally, the reproducibility of these scales was examined, revealing significant variability in results between different doctors. The study concludes that if a reliable and consistent method of measuring quality of life in cancer patients is required, it must come from the patients themselves, not from their doctors and nurses. The discussion highlights the importance of understanding the limitations of statistical correlations and the reliability of the instruments used.