A radiotherapist prescribes a new drug combination of chemotherapy and immunotherapy for metastatic melanoma. It prolongs the survival. Which of the following is true in this situation?
Incidence reduces and prevalence increases
Incidence remains the same and prevalence increases
Incidence reduces and prevalence remains the same
Incidence increases and prevalence reduces
Answer- B. Incidence remains the same and prevalence increasesIncidence: Number of new caseq occurring in a defined population during a specified period of time.It is expressed as per 1000 per year.Incidence is a rateIncidence is not affected by duration of diseaseUse of in incidence is generally restricted to acute conditions.This is a much more accurate measure of risk than prevalence.