RESUMEN
Twenty-eight cases of malignancies of different kinds were studied to assess T-cell activity and population before and after institution of therapy. Fifteen cases were diagnosed as non-metastasising squamous cell carcinoma of larynx, pharynx, laryngopharynx, hypopharynx and tonsils. Seven cases were non-metastasising infiltrating duct carcinoma of breast and 6 cases were non-Hodgkin's lymphoma (NHL). It was observed that 3 out of 15 cases (20%) of squamous cell carcinoma cases were Mantoux test (MT) negative with a T-cell population of less than 40%, 2 out of 7 cases (28.6%) of infiltrating duct carcinoma of breast were MT negative with a T-cell population of less than 40% and 3 out of 6 cases (50%) of NHL were MT negative with a T-cell population of less than 40%. The normal controls, consisting of apparently normal healthy adults, had a T-cell population of more than 40% and were all MT positive. The patients who showed a negative skin test and a T-cell population less than 40% were further subjected to assessment of T-cell population and activity after appropriate therapy, and clinical cure of the disease. It was observed that 2 out of 3 cases (66.66%) of squamous cell carcinomas, 2 out of 2 cases (100%) of adenocarcinomas and one out of 3 cases (33.33%) of NHL showed positive conversion with a T-cell population of more than 40%.