I just went through the book on Yoga and Cancer by Svyasa, Bangalore wherein there were wonderful reports of yoga therapy; the extracts (page 53 of Yoga and Cancer) I mention below for your query; i hope that these points will enlighten you:
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Ishu Ishiyama of Japan in the year 1990 reported success in 2 terminal cancer patients.
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Simonton et al from USA have reported great success in rehabilitating cancer patients by a holistic approach with diet and yoga.
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Dr. Patel from Wales has been using yoga for treating cancer patients.
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Swami Satyananda Saraswati of Bihar School of Yoga has treated cancer through Yoga nidra and Pranayama.
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Dr. Deepak Chopra in USA reported several examples of sco called "Spontaneous Regression" in whom there was a consistent observation that they will not die of cancer.
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Dr. Bemie Siegel has brought out clearly the power of mind over Cancer Imagery, relaxation response, hope, love and strong will to live, can regress even terminal cases of cancer.