Can tumors be psychosomatic?

I'm watching Star Trek DS9 and the doctor just said tumors can manifest psychosomatically. Is that a medical idea from when the show was being made in the 90's? Do you think the writers were just taking liberties? I can't find anything today about psychosomatic tumors, except helping cancer patients... show more I'm watching Star Trek DS9 and the doctor just said tumors can manifest psychosomatically. Is that a medical idea from when the show was being made in the 90's? Do you think the writers were just taking liberties? I can't find anything today about psychosomatic tumors, except helping cancer patients minimize and deal with psychosomatic symptoms.
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