Hello Mehedi! If it is what your doctor has said, then you should continue with your mother's chemotherapy till she comes to India. Judging from what you have written and the line of treatment adopted, I assume that the gall bladder cancer is unresectable. So in this case Chemotherapy, Radiation Therapy or both can be used.

Factors effecting the cost - 

In case of Chemotherapy, you might already know that Chemotherapy cost depends on the drugs and the number of cycles the drug is administered. In case of Radiation Therapy the cost depends on the number of sittings. Overall, both these treatments will be comparatively at a lesser price in a Government Hospital but with the issue of being in a waiting list for treatment.

Approximate cost -

The costs are as follows: 

1. Chemotherapy - Government Hospital - 200 USD to 500 USD ( 14,300 INR to 35600 INR. Private Hospital - 1200 USD - 1500 USD ( 85,300 INR - 107,000 INR )
2. Radiation Therapy - Government Hospital - 3000 USD to 4000 USD (214,000 INR to 285,000 INR). Private Hospital - 4,000 USD to 5,000 USD (285,000 INR to 357,000 INR)

You can find hospitals on our page - Cancer Hospitals in India.