Cancer chemotherapy can be traced back to the 1940s and since then the world has witnessed the discovery and the important application of several new drugs the successes of combination chemotherapy suggested that all cancers can be treated provided that the correct combination of drugs at the correct doses and correct intervals are established. Cancer chemotherapy can be traced back to the 1940s and since then the world has witnessed the discovery and the important application of several new drugs the successes of combination chemotherapy suggested that all cancers can be treated provided that the correct combination of drugs at the correct doses and correct intervals are established. January 2008 doi. Cancer chemotherapy can be traced back to the 1940s and since then the world has witnessed the discovery and the important application of several new drugs the successes of combination chemotherapy suggested that all cancers can be treated provided that the correct combination of drugs at the correct doses and correct intervals are established. Cancer chemotherapy can be traced back to the 1940 s and since then the world has witnessed the discovery and the important application of several new drugs the successes of combination chemotherapy suggested that all cancers can be treated provided that the correct combination of drugs at the correct doses and correct intervals are established