23 identical twin pairs, one with a hematologic malignancy, the other a bone marrow donor, completed the MMPI while in the hospital. The validity, clinical, and Repression-Sensitization scales were scored. Paired t tests for the entire group (aged 16 to 67 yr., M = 44 yr.) showed significant differences on Hs, D, and Hy. Males (n = 12 pairs) had no significant differences, while females (n = 11 pairs) had significant differences on Hs, D, Hy, Pa, and R-S. Female patients scored higher on Hs, D, Hy, lower on Pa and were repressors. These findings are congruent with previous research that has yielded psychological differences in people who develop malignancies and those who do not.
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