If this cures people's cancer, great! There can never be too much of that.
Maybe it was just a slip of the tougue or perhaps it's just the way you wrote the question without giving it much thought, but "is this the cure?", frames the question in a way that makes it look like there is only one cure to be found. Again, maybe that was not intended.
Rife cured 100% of the test patients brought to him. This occured over 70 years ago. The patients had all been diagnosed as terminal by orthodoxy. They were cancer free within 3 months of the first treatment. I don't recall the number, but somewhere between 15 & 20 terminal patients were brought to him. All but two were cured with the same treatment. The other two required just a bit of tweaking of the equipment, then they too were cured. There is a mountain of mystery wrapped around Rife, what he invented, and what the establishment did do steal, and subsequently bury his inventions. He and his inventions were not allowed to exist in the light of day long enough for other people to study, determine and publicly document how/why his invention cured cancers. According to the snippets we have, the university in California that sponsored this test could easily solve some of this mystery if they were to allow the public a peak at some of their archives.
Off the bat I'm skeptical of this Sodium Bicarbonate approach given that it comes by way of an Oncologist. Maybe the world is magically different in Italy. By today's standards, which tend to be applied with increasing, near univsersal uniformity minus a few exceptions, when it comes to cancer, "ongologist" is a title that speaks of a well paid person effectively with a sanctioned license to kill. The method of attacking the tumor itself is dubious, if for no other reason than it fits the profile of orthodox solutions to cancer; cut the tumor; poison the tumor; burn the tumor. There are other reasons.
You probably know the story of William Donald Kelley. For the benefit of those who don't, he developed his own protocol, mostly based on developing a diet geared towards relevant nutrition, that cured his own late stage cancer that had infected his pancreas, liver and gotten into the bones. Orthodoxy was so convinced they could do nothing for him that they sent him home with the advice "get your things in order, you don't have long to live....6 weeks, give or take". That diagnosis was given to him in the 60's. He died just two years ago. Not long after he cured himself, he began to take the information of his cure public. The establishment crushed him like a bug while using the power of the media to portray him as nothing but a lunatic quack. The protocol he developed did one thing: it provided his body with the proper nutrition it needed to in turn use it's own natural cancer-curing mechanisms to dispose of the tumors, expel the waste from this body and cure the cancer as well, all on it's own. People are fond of saying "the mind is a terrible thing to waste", but the reality is, if minds wouuld learn how to not get in the way of their bodies, the body knows how to cure cancer all on it's own. About the only thing it needs from the mind is the will to arrange for delivering to it essential nutrition while otherwise not getting in the way.
Jerry Brunetti developed his own method for curing his non-Hodgkins Lymphoma. Similar yet different to Kelley, Jerry developed a diet - Foods As Medicine, that furnished his body with the nutrition it needed in order to take care of the tumors and cancer. He walked away from orthodoxy's solution when his twosome of licensed killers strongly advocated "some agressive chemotherapy, Mop, and Chop", which Jerry found out are pharmaceutical chemcial cocktails based on derivatives of leftover stockpiles from Mustard Gas used during the war to end all wars. Since then, Jerry has re-discovered through his own efforts some telling cancer information that was turned up by a military research doctor as early as the late 50s; surgically remove the primary tumor and this is likely to hasten the patient's death. Why? Because the primary tumor sends out bio-chemical messages that deprive the many satellite smaller tumors of the lion's share of nutrition put into the body. The Primary Tumor wants most of this for itself. Remove the Primary Tumor and the satellites "baby tumors" no longer have a governor dictating how much food they get. I have no idea how this effect might apply to the attempts of thsi guy in Italy to cure by attacking the tumor, but only mention it to point out the flaw in orthodoxy's mentality of associating the tumor as one and the same with cancer. This no doubt leads them to their mentality to "get the tumor!". William Kelley discovered that by the time a person has a cancerous tumor large enough to be noticed or acknowledged by orthodox diagnostic methods, the person has already had cancer for 2 to 3 years.
Anyway, just to recap, here are 3 examples of the cure. Who's to say how many others have been developed and mostly kept from the light of day down through the years?