All of the following statements about immune responses to tumors are true EXCEPT:

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The most common tumors are carcinomas,originating from epithelial cells of organs such as the lung,colon,breast,and prostate.These tumors do not occur more frequently in immunocompromised hosts than in the general population.The types of tumors that do occur more frequently in immunocompromised hosts,such as AIDS patients or allograft recipients receiving chronic immunosuppressive therapy,are those with a clear viral etiology.Examples include Epstein-Barr virus-associated lymphomas and human papillomavirus-associated cervical and skin carcinomas.It is true that T cells and antibodies specific for molecules expressed exclusively or abundantly on tumor cells can be found in tumor patients and that lymphocytic infiltrates are a histologic indication of better prognosis for a limited number of tumors.Nonetheless,the naturally occurring immune responses that occur against tumor antigens are usually not capable of eliminating tumors.

All of the Following Statements About Immune Responses to Tumors