More lesions and his existing tumor have grown, is it possible that PD-L1 will s - 1289132

Hello, I am new to GRACE, my husband was diagnosed with bladder cancer in May 2010. On Sept 2014, they removed his bladder and prostate after several sessions of Chemo due to bladder cancer. They replace his bladder with a neobladder.
Last October, during his checkup, we were informed that two lymph nodes located on his lungs were growing. In November, he contracted a back infection and during this time we were advised to have a biopsy of his lungs but my husband wanted to wait until his back infection cleared because one of the doctors suggested it was probably due to the infection. They check again in February and the lymph nodes were still growing, long story short he had the biopsy in July. After dealing with various doctors and getting a second opinion we were informed that his cancer was a metastatic bladder cancer.
They delayed his chemo start date (August) because he had pneumonia and a kidney infection and ended up in the hospital, so we had to wait for him to get stronger. He started treatment, Sept 13, 2016 with ddMVAC. His body did not do well, more infections and other complications, after only one dose of ddMVAC it was stopped.
Now October 26, they started him on PD-L1, prior to starting him they had to do a scan to get a starting point on where he is. They found more lesions and his existing tumor have grown again.
Is it still possible that the PD-L1 can shrink down all the tumors? At this point, should we be thinking of other options? Our doctor is difficult to reach and my husbands appointment is not until next Wednesday when he goes in for his second treatment.
I appreciate any help or guidance that you can give us.
-Suki 8-O