Yoga s being oversold for entirely different reasons. Baba Ramdev is alleged to have said that it can cure cancer, but has not produced any case so far.

Linda carlson a psycho social research and the lead investigator at the Tom Baker Cancer centre in its study rrevealed that yoga can cure cancer. Why Ramdev, entire world confirms that Yoga can cure cancer.

http://www.sciencealert.com/world-first-evidence-suggests-that-meditation-alters-cancer-survivors-cells

I agree with a member that Yoga is not cure for every issue. One of my friends of obsessed with Yoga. so he suggests this for every problem.  I noticed that he suggested Pranayam to a common friend of us for cure of family issues. He felt depressed as his family members were not giving him proper regard. Then I intervened and said that the solution lies in ignoring the family members'  attitude and instead he should be busty with his own interests and hobbies. There is no harm to Yoga also but this is not a solution for every thing.   

If yoga could cure cancer why has it not become popular. Why people in India the birth land of yoga are spending a fortune on its treatment and dying.  It is time that love for yoga should not be stretched too far. I am sure yoga teaches humility to accept at least once a real view point expressd by almost everybody.

Humility is needed. But it should be shown before those who  come up with a convincing and better alternative for yoga's  efficacy.

Kindly answer the substantive part of the reply to have a meaningful discussion, in this case yoga and cancer. 

Sure. Kindly see the the link that proves scientifically the efficacy of meditation and yoga in curing yoga in the same discussion forum.

Yoga cannot cure cancer but it can arrest the growth of cancer cells and that too in certain types only, which is possible even through exercise like brisk walking and gym because the blood circulation increases ..My cousin is a cancer specialist working at Manipal Hospital in Bangalore and he has 24 years of experience and this is what he has told me..

Of course. Exercising arguably will certainly help.

I personally feel that meditation can help a depressed person feel a little better and if practised regularly then there will be a change for the better. Now, the point is how to motivate a person to meditate when his/her mind is negatively charged. They need proper care but with it they must be constantly counselled to face the realities of life strongly. Other than medication, counselling definitely helps but it needs time. There can't be speedy recovery but it's a time taking matter.