In the early 20th century, as medical science continued to evolve, a variety of theories emerged about the origins and causes of cancer. One of the more controversial voices in this conversation was Dr. W. B. Clark , a physician who, in 1909 , boldly declared that parasites were the primary cause of cancer . His views sparked both intrigue and skepticism within the scientific community, highlighting the tensions between emerging medical theories and established norms of the time. Who Was Dr. W. B. Clark? Dr. W. B. Clark was a practicing physician in Indiana, active during a period when cancer research was still in its infancy. Although not a household name today, he contributed to the growing body of medical speculation and debate surrounding the nature of cancer. At the time, cancer was poorly understood, and treatments were rudimentary at best. Researchers explored a wide range of causes, from environmental factors to heredity — and in Clark's case, infectious organisms . The Par...