A patient diagnosed with Stage 4 colon cancer. After 3 months of complimentary treatment using herbal extract combined with one course of chemotherapy, in a subsequent visit, patient was re-classed as Stage 1 (in remission).

-How to evaluate treatment efficacy since both modern and traditional treatments were concurrently employed?

-Disregard the degree of contribution from either treatment (chemo & herbal), what would be a correct calculation of improvement of survival rate change from stage 4 to stage 1?

-What would be an appropriate sample size in clinical trial of this type?

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