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Table 2 Incidence of malignancies during follow-up

From: Superior physical and mental health of healthy volunteers before and five years after mobilized stem cell donation

  Observed number of cases in the study population Annualized incidence rate in Germany (per 100.000) Expected number of cases in the study population p-value
Malignant skin melanoma 2 24.22 0.193 < 0.0001
Hodgkin's lymphoma 1 2.89 0.023 < 0.0001
Non-Hodgkin's lymphoma 0 20.78 0.166 0.6835
Multiple myeloma 0 9.42 0.075 0.7837
Myelodysplastic, myeloproliferative, and other hematopoietic neoplasms 0 4.40 0.035 0.8512
Thyroid cancer 1 3.02 0.023 < 0.0001
  1. Statistically significant differences are shown in boldscript
  2. Comparison of incidence rates of malignancies during the study with those of the German population in 2019 (using a Chi2-test). Based on the incidence rate of the different diseases for the German population according to the German cancer registry the expected number for our cohort is calculated over the cumulative observation time corrected for the time of discontinuation, if applicable, and assuming largely age-independent, linear distribution of cancer occurrence [27]